@article {1876, title = { Advanced materials for energy harvesting, storage, sensing and environmental engineering }, journal = { EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS }, volume = {88}, year = {2020}, author = {M. EL-JOUAD and R. BENNACER and M. EL-GANAOUI and J.M. NUNZI} } @article {1874, title = { Building incorporated bio-based materials: Experimental and numerical study }, journal = { JOURNAL OF BUILDING ENGINEERING }, volume = {28}, year = {2020}, abstract = {

In building environments, several research on dynamic moisture storage in hygroscopic building materials has improved interest in moisture buffering capacity of bio-based materials and demonstrated the potential of these materials to improve thermal comfort and buildings energy consumption. This paper presents an investigation, which aims to compare the hygroscopic behavior of different bio-based materials to identify their hygric proprieties. For this, an experimental facility is used to measure the moisture buffer value (MBV) for different categories of building materials. Thereafter, a dynamic simulation has been carried out by using TRNSYS software in order to evaluate heating and cooling loads. The results showed that the wood-cement composite still has excellent moisture regulator when compared to wood panels or fibrous materials. It has a buffer capacity superior to 3 [g/m(2).\% RH] very close to that of wood fiber panels. The simulation results of the different cases showed that the insulation reduces significantly total energy demand, but it does not lead heat evacuation in the summer season. Thus, from this study, it can be concluded that a natural ventilation mechanism is recommended to improve energy efficiency in the building.

}, author = {F. MNASRI and S. BAHRIA and M.E.A. SLIMANI and O. LAHOUCINE and M. EL-GANAOUI} } @article {1863, title = { Magnetohydrodynamic natural convection of hybrid nanofluid in a porous enclosure: numerical analysis of the entropy generation }, journal = { JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY }, year = {2020}, abstract = {

The effect on the entropy production and MHD convection of the hybrid nanofluid Al2O3-Cu/water (water with Cu and Al2O3 nanoparticles) in a porous square enclosure is studied numerically via Galerkin finite element method. The enclosure used for flow and natural convection analysis is subjected to sinusoidal varying temperatures at the boundaries. Calculations were performed for specific parameters of the Rayleigh number (Ra = 10(3)-10(6)), porosity ratio (epsilon = 0.1-0.9), Darcy number (Da = 10(-5)-10(-2)), Hartmann number (Ha = 0-100) and nanoparticles concentration (phi = 0-0.08). The numerical results are presented by velocity profiles, isotherms, streamlines, and Nusselt number. They indicate that the isotherms subject to estimation variations under Ha boost from 0 to 100 as Ra enhances. At high Ha, the conduction transfer mechanism is more obvious. Also, it is seen that the convective heat transfer becomes stronger with the enhancement of the Ra while it detracts with the rise in Ha. Due to the Ra increase, the flow cell becomes stronger. For Ra = 10(6) and higher Hartmann numbers, the isotherms remain constant which is an indication of convection predominance.

}, author = {Z. ABDEL-NOUR and A. AISSA and F. MEBAREK-OUDINA and A.M. RASHAD and H.M. ALI and M. SAHNOUN and M. EL-GANAOUI} } @article {1881, title = { Numerical study of the melting and resolidification of the substrate during the impact of a ceramic droplet in a plasma spraying process star }, journal = { EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS }, volume = {88}, year = {2020}, abstract = {

The substrate melting can significantly improve the properties of plasma spray coatings. Indeed the adhesion of the projected particles to the substrate can be ameliorated by the substrate melting. In this article, a numerical model is developed to study the dynamics of fluids and heat transfer with liquid/solid phase change during impact of a fully melted alumina particle on an aluminum solid substrate, taking into account of the substrate melting. The model is based on solving the Navier-Stokes and energy equations with liquid / solid phase change. These equations are coupled with the fluid of volume method (VOF), to follow the free surface of the particle during its spreading and solidification. The finite volume method is used to discretize the equations in a 2D axisymmetric domain. A comparison with the published experimental results was carried out to validate this numerical model. Simulations were performed for different initial droplet diameters to study its effect on droplet spreading as well as on substrate melting. It has been observed that the substrate melting begins before the droplet spreads completely; the substrate melting reaches its maximum when the droplet is close to its total solidification. Droplet spreading and substrate melting are more important for large sizes droplets.

}, author = {M. DRIOUCHE and T. REZOUG and M. EL-GANAOUI} } @article {1887, title = { Pressure-Driven Gas Flows in Micro Channels with a Slip Boundary: A Numerical Investigation }, journal = { FDMP-FLUID DYNAMICS \& MATERIALS PROCESSING }, volume = {16}, year = {2020}, pages = {147-159}, abstract = {

In this paper, flow of slightly rarefied compressible nitrogen in microchannels has been investigated numerically for low values of Reynolds and Mach numbers. The 2D governing equations were solved using Finite Element Method with first-order slip boundary conditions ( Comsol Multiphysics software). A validation was performed by comparing with similar configuration from the literature. It was found that our model can accurately predict the pressure driven flow in microchannels. Several interesting findings are reported about the Relative pressure, longitudinal velocity, Mach number, effect of gas rarefaction and flow rate.

}, author = {A. AISSA and M.E.A. SLIMANI and F. MEBAREK-OUDINA and R. FARES and A. ZAIM and L. KOLSI and M. SAHNOUN and M. EL-GANAOUI} } @article {1883, title = { Some flow patterns within ventilation strategy coupled to energy efficiency }, journal = { EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS }, volume = {88}, year = {2020}, abstract = {

Energy and buildings are increasingly becoming subjects for investigations, especially for the indoor air quality domain coupled to energy demand. The physics of fluids flowing inside enclosures bring basic models to understand and build better schemes. This paper is devoted to studying ventilation strategies in regards to Indoor Air Quality (IAQ) and energy efficiency in floor refreshing houses. A room model is considered in a simplified level, as a cavity heated on the external sidewall and cooled on the bottom ground surface. The external air injector is at variable positions and interacting with the needed cooling power; the air quality (mixing ability) and thermal comfort are also studied. The cooling efficiency inside the considered volume and the average air temperature are analyzed for a given temperature difference characterizing the natural convection level (Rayleigh number, Ra = 10(6)) and a horizontal ventilation (moderate Reynolds number Re = 10(2)). An obtained complex flow structure indicates that the natural convection and the forced flow (ventilation) act directly on the resulting patterns, mixing ability, heat exchange which in a straight line affect the thermal comfort and in fine the energy cost (cooling requirement).

}, author = {S. MORSLI and R. BENNACER and M. EL-GANAOUI and H. RAMENAH and A. CARMASOL} } @article {1794, title = { Assessment of hygrothermal behavior of newly straw-rape concrete material in various conditions }, journal = { HEAT AND MASS TRANSFER }, volume = {55}, year = {2019}, pages = {2785-2796}, abstract = {

This article focuses on study of hygrothermal behavior of building made of new bio-concrete based on straw-rape. The assessment was conducted using a numerical study, performed using a coupled heat and mass transfer model which takes into account the temperature dependence of the moisture retention curve. The model consists on coupling of envelope model with mono-zone building ambient air model which takes into account ventilation, occupants production and internal inertia in term of thermal and moisture buffering. The model of building envelope was validated by comparison against experimental data carried out on real scale wall. The results reveal that considering moisture retention curve as a temperature-dependent property leads to better prediction of the relative humidity variation in the material, whereas it has weak influence on temperature variations. However, the overall isothermal model may be enough to predict the temperature and relative humidity variations of the indoor ambient air of building. Results have showed good contribution of the internal thermal inertia to reduce temperature variation of the ambient air of building. In addition, simulations highlighted strong capacity, of the straw-rape concrete, to damp the high variations of outdoor relative humidity for all considered climates, especially in desert climate. This effect conduces to avoid accumulation of moisture in the material thus it may rise the life service of the wall.

}, url = {https://hal.archives-ouvertes.fr/hal-02350660}, author = {M. RAHIM and R. DJEDJIG and O. DOUZANE and T. LANGLET and M. EL-GANAOUI} } @article {1838, title = {The Effect of the Fin Length on the Solidification Process in a Rectangular Enclosure with Internal Fins}, journal = { FDMP-FLUID DYNAMICS \& MATERIALS PROCESSING }, volume = {15}, year = {2019}, pages = {125-137}, abstract = {

The aim of the proposed work is to study the solidification process within a rectangular enclosure provided with three internal rectangular fins attached to the left vertical wall of the cavity. This latest is filled with a phase change material (PCM), initially liquid, at a temperature above its melting temperature. The solidification process was initiated by cooling the left wall and fins to a temperature lower than the melting temperature. In order to study and examine the thermal behavior and thermal performance of the proposed system, a mathematical model, based on the conservation equations of mass, momentum and energy was developed. The governing equations and their associated boundary and initial conditions were next adimensionalyzed. Therefore, several controlling parameters were appeared. The volume control method was used to discretize the equations. The resulting algebraic equations were solved iteratively. Numerical investigations were carried out to study and examine the effect of the dimensionless fin length on the hydrodynamic and thermal fields of the flow, the dimensionless heat flux, the solidified mass fraction and the dimensionless time of complete solidification.

}, url = {http://tsp.techscience.com//uploads/attached/file/20190617/20190617075402_53703.pdf}, author = {L. KHATRA and H. EL-QARNIA and M. EL-GANAOUI} } @article {1832, title = { Integration of the PCM with intra-ventilation for improved thermal and inertial characteristics of the building envelope }, journal = { EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS }, volume = {84}, year = {2019}, abstract = {

Several solutions based on phase change materials (PCM) are used for the thermal regulation of buildings. In this study, a combination of the inertial effect of PCM and intra-ventilation regulation is proposed. The purpose is to increase the thermal inertia of the building envelope leading to a fast passive and active cooling of the indoor environment. The principle of the solution is the use of a polymer-stabilized paraffin in external walls integrating ventilation pipes. For that, an experimental study of a hollow concrete block with PCM and ventilation tubes is conducted to test its thermal response. Gathered to this part, a 3D numerical model is developed under COMSOL Multiphysics (R). The obtained simulation results are in good agreement with the experimental data. A parametric study is then performed including its actual characteristics against several conditions; it is revealed that the use of PCM gathered to the ventilation tubes enhances the thermal phase shift. It is stated that the forced ventilation through the tubes makes it possible to manage the energy and contribute to the renewal of the air.

}, url = {https://hal.archives-ouvertes.fr/hal-02076663}, author = {A. LAAOUATNI and M. MARTAJI and R. BENNACER and M. EL-OMARI and L. BIN and M. EL-GANAOUI and A. Merabtine} } @article {1775, title = { Magnetic field impact on nanofluid convective flow in a vented trapezoidal cavity using Buongiorno{\textquoteright}s mathematical model }, journal = { EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS }, volume = {88}, year = {2019}, abstract = {

Numerical study for the effect of an external magnetic field on the mixed convection of Al2O3-water Newtonian nanofluid in a right-angle vented trapezoidal cavity was performed using the finite volume method. The non-homogeneous Buongiorno model is applied for numerical description of the dynamic phenomena inside the cavity. The nanofluid, with low temperature and high concentration, enters the cavity through the upper open border, and is evacuated through opening placed at the right end of the bottom wall. The cavity is heated from the inclined wall, while the remainder walls are adiabatic and impermeable to both the base fluid and nanoparticles. After validation of the model, the analysis was carried out for a wide range of Hartmann number (0 \<= Ha \<= 100) and nanoparticles volume fraction (0 \<= phi(0) \<= 0.06). The flow behavior as well as the temperature and nanoparticles distribution shows a particular sensitivity to the variations of both the Hartmann number and the nanofluid concentration. The domination of conduction mechanism at high Hartmann numbers reflects the significant effect of Brownian diffusion which tends to uniform the distribution of nanoparticles in the domain. The average Nusselt number which increases with the nanoparticles addition, depends strongly on the Hartmann number. Finally, a correlation predicting the average Nusselt number within such geometry as a function of the considered parameters is proposed.

}, author = {M. BENZEMA and Y.K. BENKAHLA and A. BOUDIAF and S.E. OUYAHIA and M. EL-GANAOUI} } @article {1776, title = { Modelling the hygrothermal behaviour of cement-bonded wood composite panels as permanent formwork }, journal = { INDUSTRIAL CROPS AND PRODUCTS }, volume = {142}, year = {2019}, abstract = {

This paper reports on the hygrothermal behaviour of a new bio-based composite building material, based on recycled wood fibres used as eco-aggregate within a cementitious matrix. A coupled heat and moisture transfer was established through the material and resolved numerically with a model developed herein. Relative humidity and temperature were chosen as driving potentials. The hygric and thermal properties of the material were analysed and then used as input parameters in the model. The accuracy of the latter was verified by comparing the simulation results with experimental hygrothermal tests, from which the moisture buffering value (MBV) could be determined. The MBV showed that the wood-cement composite material might contribute to improve the indoor thermal comfort and be relevant for low-energy building design.

}, url = {https://hal.univ-lorraine.fr/LERMAB-UL/hal-02357702}, author = {M. LI and V. NICOLAS and M. KHELIFA and M. EL-GANAOUI and V. FIERRO and A. CELZARD} } @article {1834, title = { Morphological Approach for Nonlinear Flow and Heat Transfer in Complex Bio-Composite Material }, journal = { HEAT TRANSFER ENGINEERING }, volume = {40}, year = {2019}, pages = {1486-1497}, abstract = {

The bio-based materials have experienced in recent years a relevant evolution in construction and for many building applications. Despite the efforts to develop new solutions to achieve the objectives of numerical characterizations a few researches in this area have been carried out using a heterogeneous wood-cement composite. This study is based on a constructive approach using the finite volume method in order to generate a numerical model capable of reproducing;the equivalent transfer properties of a wood-cement composite. The challenge is to understand, design, and control this multiphase inhornogeneous structure and predict transfers and flows within the community in order to achieve an optimal functionality. Experimental measurements and microscopic characterization using X-ray microtomography were performed to compare and demonstrate the method validation. The comparative results demonstrate a less than 100\% deviation between the measurements and the simulations of the equivalent thermal properties. Thus, thermal conductivity and permeability, under different medium configurations, were characterized. Therefore, it was observed that these properties depend strongly on the porosity and the pore distribution in the continuous phase. Moreover, these two parameters are highly dependent on cement percentages in the structure.

}, author = {R.C. DEPTULSKI and F. MNASRI and M. EL-GANAOUI and R. BENNACER} } @article {1804, title = { Second law analysis of MHD mixed convection heat transfer in a vented irregular cavity filled with Ag-MgO/water hybrid nanofluid }, journal = { JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY }, volume = {137}, year = {2019}, pages = {1113-1132}, abstract = {

The present paper investigates numerically the effect of an external magnetic field on heat transfer and entropy generation of Ag-MgO (50:50vol\%)/water hybrid nanofluid flow in a partially heated irregular ventilated cavity. A finite-volume FORTRAN code has been written to solve the governing partial differential equations. New empirical correlations specifically dedicated to predict the dynamic viscosity and the thermal conductivity of the considered hybrid nanofluid were employed. After validation of model, the analysis has been done for a wide range of Reynolds number (10?Re?600), Hartmann number (0?Ha?80) and total nanoparticle volume fraction (0?phi?0.02). The results are presented in terms of streamlines, isotherms and isentropic lines as well as the average Nusselt number (Nu(m)), the average entropy generation (S-gen,(m)) and the Bejan number (Be-avg). The criterion =S-gen,(m)/Nu(m) is adopted to discuss the thermal performances of the system. The results reveal that the intensification of the magnetic field tends to attenuate the heat transfer convection and to reduce the thickness of the thermal boundary layer, close to the active walls. Globally, adding nanoparticles to the base fluid improves the heat transfer but increases the total entropy generation.

}, author = {M. BENZEMA and Y.K. BENKAHLA and N. LABSI and S.E. OUYAHIA and M. EL-GANAOUI} } @article {1830, title = { Some Insights on Unsteady Double Diffusive Natural Convection of Porous Medium in Vertical Open-Ended Cylinder }, journal = { ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING }, volume = {44}, year = {2019}, pages = {1379-1392}, abstract = {

The work presented in this paper deals with combined heat and mass transfer by natural convection in porous media. The aim is to investigate numerically the effect of control parameters on the flow behavior as well as the enhancement of heat transfer in vertical porous enclosure. The side wall temperature is periodic function of time which is the case in several physical problems. The Darcy\&$\#$39;s flow model coupled with the energy and mass equations is considered. The numerical results show that the flow\&$\#$39;s behavior is strongly dependent on the buoyancy ratio values. Three types of flows take place: chimney, reversal and top aspiration flow. Further, the effect of buoyancy ratio (N) at which the different flow types occur is significantly influenced by the values of control parameters. The relative heat transfer enhancement between constant and periodical wall temperature is profoundly affected by thermal Rayleigh number (Ra), buoyancy ratio and dimensionless amplitude (XA). In the case of opposing double diffusive flow, the relative difference becomes to the favor of the stationary case for high Ra and XA.

}, author = {N. HIMRANE and D.E. AMEZIANI and M. EL-GANAOUI and H. RAGUEB} } @article {1831, title = { Structural response of cement-bonded wood composite panels as permanent formwork }, journal = { COMPOSITE STRUCTURES }, volume = {209}, year = {2019}, pages = {13-22}, abstract = {

Bio-sourced materials combined with a cementitious matrix offer an interesting alternative to traditional construction materials. To contribute to their wider acceptance by the sustainable construction market, an investigation into the use of wood-cement composite panels as stay-in-place or permanent formwork is presented. As individual panels, the mechanical performance was evaluated through three point bending tests. But, as part of the formwork system, their overall structural performance was evaluated through finite element simulation under the action of lateral pressure exerted by the concrete in a liquid state. The Concrete Damage Plasticity Model (CPDM) available in the Abaqus code is adapted and used to model the mechanical behaviour of the wood-cement composite. The obtained results show wood-cement composite panels offer a promising alternative for the development of a lightweight permanent formwork system, that can contribute to the thermal and acoustic comfort of green buildings.

}, author = {M. LI and M. KHELIFA and A. KHENNANE and M. EL-GANAOUI} } @article {1822, title = { Thermal building control using active ventilated block integrating phase change material }, journal = { ENERGY AND BUILDINGS }, volume = {187}, year = {2019}, pages = {50-63}, abstract = {

In the context of improving energy efficiency and thermal comfort in the building, the use of phase change materials (PCMs) is one of the suggested solutions. The proposed integration solutions concern the building envelope as well as the applications related to its operation. The study of the incorporation of PCM in the walls of the building was the subject of numerous works. However, the antisymmetric character of storing/recovering energy management in the walls is less controlled and do not fit the optimal conditions. In this study, a solution based on the direct integration of a stabilized PCM (gel) in an envelope including ventilation channels, was proposed to overcome this problem of antisymmetry storing/recovering and fitting with different fixed ambient conditions. The final aim is to develop the optimization strategy of a wall combining the heavy inertia offered by the PCM, intra-ventilation control and the contribution to air renewal energy demand.

In this context, an experimental study of a concrete block system is conducted to test the thermal response of this configuration by the application of cyclic solicitations. The comprehension of this integrated constructive solution essentially passes by the possession of validated numerical tools. For this, two models have been developed. The first model using the electrical-thermal analogy, based on an RC equivalence, is distinguished by its relative simplicity and weak time computing demand. Each of these two factors, R and C summarise the system properties and has a direct influence on the building transient simulations over a year. The second one is based on direct numerical simulation DNS of the energy and fluid flow equations using commercial code COMSOL Multiphysics. Such DNS is time consuming and could not be used to simulate over a year but aims only to validate the first RC circuit approach. A comparison of these two models with the idealised experimental data was carried out and allowed the validation of the thermal behaviour of the solution based on the integration of the PCM with core ventilation.

}, author = {A. LAAOUATNI and N. MARTAJ and R. BENNACER and M. LACHI and M. EL-OMARI and M. EL-GANAOUI} } @article {1710, title = { Computational Simulation of Entropy Generation in a Combustion Chamber Using a Single Burner }, journal = {ENTROPY}, volume = {20}, year = {2018}, abstract = {

In this study, we examine the behavior of a propane diffusion flame with air in a burner; the computational investigations are achieved for each case employing the Fluent package. The graphs generated illustrate the influence of flow parameters, the effects of the oxygen percentage in the air, and the effects of the equivalence ratio phi on the entropy generation, the temperature gradients, and the Bejan number. The obtained results show that incorporation of hydrogen with propane reduced both temperature and carbon monoxide emission.

}, author = {S. MORSLI and A. SABEUR and M. EL-GANAOUI and H. RAMENAH} } @article {1718, title = { Effect of aligned and misaligned ventilation opening affecting energy demand and air quality in buildings }, journal = { EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS }, volume = {83}, year = {2018}, abstract = {

This work focuses on a horizontally ventilated cavity filled with air, heated on one side wall and cooled on the floor surface. Therefore, this study has been carried out for a convective loop induced for a fixed Rayleigh number Ra= 10(6) and horizontal ventilation (moderate Reynolds number Re= 100) where the injection is either in cooperating or opposing to the convective loop. The study undertaken concerns different opening position in order to analyze the energy efficiency of such ventilation and the corresponding indoor air quality. The results obtained indicate that the natural convection and the forced flow (ventilation) play an important role in the flow structure and the mixing ability, the heat exchange (cooling need) and the temperature comfort. The optimum ventilating position is a compromise in order to minimize the cooling demand, keep the mixing ability and reduce the temperature heterogeneity.

}, url = {https://hal.archives-ouvertes.fr/hal-02076687}, author = {S. MORSLI and H. RAMENAH and M. EL-GANAOUI and R. BENNACER} } @article {1719, title = { Modelling of heat transfer through permanent formwork panels exposed to high temperatures }, journal = { CONSTRUCTION AND BUILDING MATERIALS }, volume = {185}, year = {2018}, pages = {166-174}, abstract = {

A small-scale fire test was performed on a wood-cement panel intended as a permanent formwork. The tested panel was subjected on one side to a uniform heat flux of about 6 kW/m(2). Measurements of the temperature profiles were recorded with thermocouples embedded in the sample. The density and its variation with temperature were obtained by taking weight measurements. The thermal conductivity of the wood-cement composite at room temperature was determined using the hot plate method. Its variation with temperature and that of the specific heat were determined using analytical and numerical approaches. Using the obtained data, a pyrolysis model, implemented in Abaqus, was developed to simulate the effect of heat in the panel. The validation of the model is carried out by simulating charring tests. The model provided reasonable predictions for the thickness of the charred layer and the temperatures profiles across the depth of the panel. The model can supplement the testing of small laboratory samples to characterise the fire performance of these panels, and hence help establish their certification for use in sustainable construction.

}, author = {M. LI and A. KHENNANE and B. BRANDELET and M. EL-GANAOUI and M. KHELIFA and Y. ROGAUME} } @article {1722, title = { Numerical simulation of fire integrity resistance of full-scale gypsum-faced cross-laminated timber wall }, journal = { INTERNATIONAL JOURNAL OF THERMAL SCIENCES }, volume = {132}, year = {2018}, pages = {96-103}, abstract = {

Fire design requires three fire resistance criteria, namely integrity, insulation and load-bearing. In particular, repartition wall systems used in residential and commercial buildings are required to provide certification of insulation and integrity fire resistance and have to be analysed in the context of the characteristic time scales of a fire. This paper presents a numerical methodology to simulate the fire integrity resistance of full-scale timber based wall systems exposed to fire. The main contribution of this paper, with regard to the existing literature, is the presence of cross-laminated timber (CLT) panel in the central part of the wall system, where the pyrolysis of timber was modelled explicitly in the energy balance equation system. For this end, a user-subroutine, called UMATHT, is developed and successfully implemented in the Abaqus finite element code for thermal analysis. The falling off of the gypsum boards under fire was considered implicitly in the FE model based on experimental observations. The obtained results show clearly the need to take into account explicitly the cracks and falling off of the gypsum boards for an appropriate prediction of the integrity fire resistance in order to reduce expensive experimental procedures.

}, url = {https://hal.archives-ouvertes.fr/hal-02521730/}, author = {V.D. THI and M. KHELIFA and M. OUDJENE and M. EL-GANAOUI and Y. ROGAUME} } @article {1762, title = { REVIEW OF MODELING AND SIMULATION OF VOID FORMATION IN LIQUID COMPOSITE MOLDING }, journal = { COMPOSITES-MECHANICS COMPUTATIONS APPLICATIONS }, volume = {9}, year = {2018}, pages = {51-93}, abstract = {

Liquid composite molding (LCM) processes are being used in manufacturing near-net-shape, geometrically complex composite parts. One of the current obstacles to a larger scale application of these processes is the formation of defects such as voids during resin injection. To reach aeronautic requirements or short injection cycles in the automotive industry, entrapped air in the final part before curing has to remain as low as possible. Air entrapment will depend on the fibrous structure and on the injection parameters, or more precisely on the fluid pressure and the flow front orientation with respect to the fibrous direction. A key parameter for production of structural composite parts is air entrapment, since high void content could lead to mechanical softening, early failure, or part rejection. The quantitative simulation of the void formation is important for proper design and selection of material and processing parameters to minimize such voids in the composite materials. Despite several advancements in voidage predictions via modeling and simulations, the void formation mechanisms in RTM and similar processes are still not fully understood. In this study, a review of current approaches to modeling and simulation of void formation and unsaturated flow in the liquid composite molding process is presented. We examine modeling efforts considering all the mechanisms involved such as void formation and transport, bubble compression, and gas dissolution. In particular, the capillary number is identified as a key parameter for void formation and transport. The influence of voids on the global resin flow is also investigated and a state-of-the-art is presented.

}, author = {A. SAAD and A. ECHCHELH and M. HATTABI and M. EL-GANAOUI} } @article {1768, title = { Small to large scale mixed turbulent convection: buildings application }, journal = { INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT \& FLUID FLOW }, volume = {28}, year = {2018}, pages = {188-205}, abstract = {

The use of natural ventilation by large openings to maintain thermal comfort conditions in the premises is a concept that is perfectly integrated into the traditional architecture of countries in the Mediterranean region or in tropical climates. In a temperate climate where the architecture is not usually designed to respond to the use of natural ventilation is seasonal and is done at the initiative of the occupants by making changes in the design of their doors. The European interest in natural ventilation, as a passive building air- conditioning technology, is increasing and has been the subject of a research program commissioned by the European Community. In this work, the authors consider a part of a housing compound as a refreshing floor. This floor is maintained at a constant cold temperature, the one vertical wall at hot temperature and other surfaces are adiabatic. Various scenarios are considered for this work. Mixed convection for different boundary conditions and different configurations is carried out. In addition, an airflow is injected through a window and extracted on the opposite window. Classical conclusion and transitional value on Richardson number have been completed by the new thermal configuration with nonsymmetric thermal conditions. The complex 3D flow structure is more obvious when one of the two flows (ventilation or natural convection) dominates. However, the induced heat transfer is less sensitive to the added ventilation. In this study, the authors consider a part of a housing compound as a refreshing floor. This floor is maintained at a constant cold temperature, the one vertical wall at hot temperature and other surfaces are adiabatic.

}, url = {https://hal.archives-ouvertes.fr/hal-01724258}, author = {S. MORSLI and M. BOUSSOUFI and A. SABEUR and M. EL-GANAOUI and R. BENNACER} } @article {1763, title = { Thermal energy and economic analysis of a PCM-enhanced household envelope considering different climate zones in Morocco }, journal = { INTERNATIONAL JOURNAL OF SUSTAINABLE ENERGY }, volume = {37}, year = {2018}, pages = {515-532}, abstract = {

This study investigates the thermal energy potentials and economic feasibility of an air-conditioned family household-integrated phase change material (PCM) considering different climate zones in Morocco. A simulation-based optimisation was carried out in order to define the optimal design of a PCM-enhanced household envelope for thermal energy effectiveness and cost-effectiveness of predefined candidate solutions. The optimisation methodology is based on coupling Energyplus (R) as a dynamic simulation tool and GenOpt (R) as an optimisation tool. Considering the obtained optimum design strategies, a thermal energy and economic analysis are carried out to investigate PCMs integration feasibility in the Moroccan constructions. The results show that the PCM-integrated household envelope allows minimising the cooling/heating thermal energy demand vs. a reference household without PCM. While for the cost-effectiveness optimisation, it has been deduced that the economic feasibility is stilling insufficient under the actual PCM market conditions. The optimal design parameters results are also analysed.

}, author = {Y. KHARBOUCH and A. MIMET and M. EL-GANAOUI and L. OUHSAINE} } @article {1712, title = { Thermal performance investigation of a PCM-enhanced wall/roof in northern Morocco }, journal = { BUILDING SIMULATION }, volume = {11}, year = {2018}, pages = {1083-1093}, abstract = {

Energy efficiency improvement in building sector has become a real challenge in Morocco, especially in the northern region evolving a rapid urban growth. In this context, using the phase change materials (PCM) in the construction is presented as one of the promising solutions to enhance the thermal behaviour of building envelope. This work aims to investigate the thermal performance of a PCM integrated external wall and roof under the summer climate conditions of northern Morocco. Dynamic thermal characterization methodology is adopted through the calculation of decrement factor (DF) and time lag (TL) parameters. For that, a one-dimensional numerical model based on resistance-capacitance (RC) approach is developed and implicitly solved to simulate the heat transfer process through a wall/roof structure. The model is validated through a new small-scale experimental device. Different qualities of PCM, regarding its peak phase change temperature, have been evaluated. Moreover, the PCM layer emplacement within the wall/roof structure was evaluated considering two possible configurations. The obtained results show a significative enhancement of the thermal performance of different wall facades and roof through the use of the suitable PCM quality. An appropriate selection of PCM layer emplacement yields an evidenced enhancement in the case of the roof. As for the walls, the integration of PCM from the interior side increase the TL period but has a negative impact on the DF parameter.

}, author = {Y. KHARBOUCH and L. OUHSAINE and A. MIMET and M. EL-GANAOUI} } @article {1661, title = { Competition between the lid driven and the natural convection of nanofluids taking into consideration the Soret effect }, journal = { INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER }, volume = {114}, year = {2017}, pages = {1341-1349}, abstract = {

Natural convection, in a shallow horizontal cavity filled with a nanofluid, is studied. The flow is driven by Lid driven convection (LDC). External applied constant heat fluxes on the bottom wall of the cavity is applied, whereas the vertical walls are subjected to variable heat fluxes. The nanofluid concentration is treated as heterogeneous mixtures with a weak solutal diffusivity. A modified formulation taking into account the physical properties (thermal conductivity, viscosity) versus on nanofluids type and concentration and the spatial heterogeneous concentration induced by the Soret effect is presented. The induced nanofluid heterogeneity can affect the heat transfer. The heat transfer increases with increase of the boundary motion. The analytical solution, based on parallel flow approximation, is found to be in good agreement with numerical solution. The existence of both natural and anti-natural flows is demonstrated. Indeed, the subcritical Rayleigh number for the onset of instability tends to disappear when the supercritical threshold is largely affected.

}, author = {F.S. OUESLATI and R. BENNACER and M. EL-GANAOUI and A. EL-CAFSI} } @article {1675, title = { Finite element analysis of heat transfer through timber elements exposed to fire }, journal = { ENGINEERING STRUCTURES }, volume = {143}, year = {2017}, pages = {11-21}, abstract = {

Since timber is a combustible material, its safe use in construction will depend on a proper knowledge and modelling of the physical and chemical reactions involved in the pyrolysis, that affect the temperature growth and thus the performance of timber in fire. Based on the comprehensive one-dimensional analytical models of the pyrolysis available in the literature, it is required to implement a predictive FE model via a user-defined subroutine in the dedicated commercial software in order to describe more closely the real physical phenomena that undergo timber exposed to fire. This paper presents the implementation of the UMATHT subroutine in the Abaqus software. The obtained results showed a fairly good agreement with experimental ones from the literature. However, at this stage of the study the pyrolysis is taken into account implicitly in the developed UMATHT through gradually modified thermo-physical properties of the timber, as commonly adopted in the published literature. Work is now in progress to implement explicitly the different reactions of the pyrolysis in the developed UMATHT.

}, url = {https://hal.archives-ouvertes.fr/hal-02521755/}, author = {V.D. THI and M. KHELIFA and M. OUDJENE and M. EL-GANAOUI and Y. ROGAUME} } @article {1699, title = { NUMERICAL ANALYSIS OF HEAT, AIR, AND MOISTURE TRANSFERS IN A WOODEN BUILDING MATERIAL }, journal = { THERMAL SCIENCE }, volume = {21}, year = {2017}, pages = {785-795}, abstract = {

The present paper aims to predict the hygrothermal behavior of massive wood panel considered as bio-based building material. In this context, we developed a macroscopic model coupled no linear heat, air, and moisture transfers that incorporates simultaneously the effect of thermal diffusion and infiltration phenomenon on the building material. The model inputs parameters were evaluated experimentally according to the recognized standards of material\&$\#$39;s characterization. Therefore, numerous series of hygrothermal calculation were carried out on the 1-D and 2-D configuration in order to assess the dimensionless effect on such wooden material. Two types of boundary conditions were considered and examined. The first are at the material scale of wood drying process. The second type of conditions is at the wall scale, where the conditions of the building ambiance are considered. Moreover, the model sensitivity to the driving potentials coupling and to the parameters variability was considered and examined. It has been found that the coupling in the model had a remarkable impact on both kinetics of temperature and moisture content.

}, url = {https://hal.archives-ouvertes.fr/hal-01684849}, author = {F. MNASRI and K. ABAHRI and M. EL-GANAOUI and R. BENNACER and S. GABSI} } @article {1678, title = { Numerical investigation of heat and momentum transfer to particles in high temperature thermal spraying }, journal = { EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS }, volume = {78}, year = {2017}, abstract = {

Numerical analysis has been performed on the motion of a spherical particle injected into high temperature thermal plasma flows in order to disclose the mechanisms of heat transfer enhancement and to establish reliable correlations for heat transfer between the plasma gas and the particle. In terms of fluid dynamics occurring, the Navier-Stokes equations were solved for Ar-H-2 mixture plasma gas in a two-dimensional system by finite element method (FEM). Computational simulation was undertaken to model the correlations for fine spherical particles in Ar 25\%-H-2 75\% as plasma gas from 1100 to 9100 K at atmospheric pressure. Our results reveal the general consensus of Nusselt number, followed by increasing deviations as the temperature increases. Additionally, a comparison between our data and the predictions of other published correlations are given.

}, author = {A. AISSA and M. EL-GANAOUI and M. SAHNOUN} } @article {1698, title = { A numerical study of indoor air quality in a ventilated room using different strategies of ventilation }, journal = { MECHANICS \& INDUSTRY }, volume = {18}, year = {2017}, abstract = {

This study aimed to numerically investigate the air flow and contaminant dispersion in a ventilated room. The URANS equations supplemented with energy and concentration equations are solved using the scStream code. We are targeting primarily the ventilation effectiveness (epsilon(c)) and the index of indoor air quality (I-IAQ). Different displacement and mixing ventilation modes are investigated in isothermal conditions. The ventilation flow rate is 50 m(3). h(-1) Here, our ultimate aim is to suggest an effective ventilation that can ensure a good indoor air quality. The RNG k - epsilon model was adopted to handle the turbulence. CFD simulations were systematically checked, whenever possible, through available results. The simulation results indicate that the ventilation effectiveness to remove a contaminant and the index of indoor air quality are substantially influenced by the ventilation mode and the location of inlet and outlet air. From this study, it appears that the air flow and contaminant dispersion in a ventilated room can be typically predicted or evaluated by computer simulations.

}, author = {L. KOUFI and Z. YOUNSI and Y. CHERIF and H. NAJI and M. EL-GANAOUI} } @article {1705, title = { Thermal effects of an innovative green wall on building energy performance }, journal = { MECHANICS \& INDUSTRY }, volume = {18}, year = {2017}, abstract = {

Green walls and green roofs are innovative construction technologies involving the use environmentally friendly materials. In addition to their aesthetical and environmental benefits, green walls have significant thermal effects on buildings and heat islands within high-density urban areas. In this paper, we study the impact of an innovative green wall system on building energy performance. These green walls have specific composition and particular geometry that can lead to higher thermal performances and therefore more significant impact on building energy performance. The development, validation and prior integration of a hygrothermal green wall model in a transient building simulation tool make possible the assessment of the energy performance of buildings when covered by green walls. The used model was adapted to be the particular forms and composition of the studied green walls. In parallel, this type of green walls has been installed on a one tenth building mockup to be experimented. The aim of the experiment is to measure the thermal effects and to calibrate some parameters of the numerical model. The results highlight the thermal benefits of this kind of green walls in summer condition. They reduce annual energy demand of building up to 37\% for hot climates.

}, url = {https://hal.archives-ouvertes.fr/hal-02113149/}, author = {R. DJEDJIG and M. EL-GANAOUI and R. BELARBI and R. BENNACER} } @article {1697, title = { Wind effect on full-scale design of heliostat with torque tube }, journal = { MECHANICS \& INDUSTRY }, volume = {18}, year = {2017}, abstract = {

Despite the importance of designing support structures for solar collectors, very little reliable work has been done to investigate the forces of the wind on heliostats of solar tower at real scale. Wind loads on heliostats are usually determined at low-speed wind tunnels scale, where the design full-scale Reynolds number cannot be reached. In the present study, measured data are used to validate the simulations at wind tunnel scale. Thereafter, by using the same method, three-dimensional numerical simulations of turbulent wind flow around a big heliostat of solar tower are performed. The obtained numerical results are presented for several elevation angles at normal operation and stow position. The results revealed that the known stow position (when the backside of the heliostat is facing the ground) is not the optimum position (other optimum elevation angles are discovered) especially with high wind speed, and the effect of torque tube is significant on heliostat mean wind loads.

}, author = {M. MAMMAR and S. DJOUIMAA and A. HAMIDAT and S. BAHRIA and M. EL-GANAOUI} } @article {1642, title = { Finite element modelling of the pyrolysis of wet wood subjected to fire }, journal = { FIRE SAFETY JOURNAL }, volume = {81}, year = {2016}, pages = {85-96}, abstract = {

The modelling of the pyrolysis of wet wood provides more realistic fire scenarios for structural fire design by taking into account variable thermal properties of wood which are beyond the scope of conventional structural fire design codes. The proposed numerical methodology has been written in MATLAB environment. A 2D nonlinear finite element analysis (FEA) is performed to model the pyrolysis of wet wood subjected to high temperature. The varying of thermal proprieties of wood are discussed from the point of view of changes of structure and chemical composition under fire condition. The validity of the model is established by comparing the predicted results with results from fire resistance tests presented in literature. Qualitatively, the model provides good agreement with the experimental data. It is shown that the model can handle layers of a wooden composite structure. Temperature profiles at different points in the wood sample and the two-dimensional charring depth of Laminated Veneer Lumber (LVL) panels are calculated and compared with experimental data.

}, url = {https://hal.archives-ouvertes.fr/hal-01599583}, author = {V.D. THI and M. KHELIFA and M. EL-GANAOUI and Y. ROGAUME} } @article {1630, title = { Melting of nanoparticle-enhanced phase change material inside an enclosure heated by laminar heat transfer fluid flow }, journal = { EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS }, volume = {74}, year = {2016}, abstract = {

The proposed work presents a numerical investigation of the melting of a phase change material (PCM: Paraffin wax P116) dispersed with nanoparticles (Al2O3) in a latent heat storage unit (LHSU). The latter is composed of a number of vertical and identical slabs of nano-enhanced phase change material (NEPCM) separated by rectangular channels through which passes heat transfer fluid (HTF: water). A mathematical model based on the conservation equations of mass, momentum and energy has been developed. The resulting equations are discretized using the finite volume approach. The numerical model has been validated by experimental and numerical results published in literature. Numerical investigations have been conducted to evaluate the effects of the volumetric fraction of nanoparticles, HTF mass flow rate and inlet temperature on the latent heat storage unit\&$\#$39;s thermal behaviour and performance. Modelling results show that the volumetric fraction, HTF mass flow rate and inlet temperature need to be designed to achieve a significant improvement in thermal performance.

}, author = {R. ELBAHJAOUI and H. EL-QARNIA and M. EL-GANAOUI} } @article {1633, title = { Numerical damage prediction in dowel connections of wooden structures }, journal = { MATERIALS AND STRUCTURES }, volume = {49}, year = {2016}, pages = {1829-1840}, abstract = {

The behaviour of timber connections is very complex because of the interaction between brittle and ductile failure modes that develop within the contact areas between the timber and the dowel. Simulating this behaviour numerically requires the use of multidimensional failure criteria as well as the use of coupled constitutive equations accounting for both non-linear isotropic hardening and isotropic ductile damage. Such a formulation is proposed in the present work and implemented within a Vumat user-defined subroutine in Abaqus/Explicit. The model is used to simulate the behaviour of a double shear timber steel connection. Good agreement was found between the FE results and experimental ones, which showed the good capability of the model to predict the onset of ductile damage and growth. It was found that failure results from ductile defects initiation, growth and propagation inside narrow shear bands wherein the plastic strain is highly localised.

}, url = {https://hal.archives-ouvertes.fr/hal-01294587}, author = {M. KHELIFA and A. KHENNANE and M. EL-GANAOUI and A. CELZARD} } @article {1602, title = { Parametric study of solar heating and cooling systems in different climates of Algeria - A comparison between conventional and high-energy-performance buildings }, journal = {ENERGY}, volume = {113}, year = {2016}, pages = {521-535}, abstract = {

Parametric optimization using dynamic simulation of a solar thermal system for producing hot water, space heating and cooling was developed. The system layouts include a single-effect absorption chiller activated by heat generated by flat plate solar collectors and stored in a solar storage tank. Two construction types were compared; the first is the typical construction in Algeria (low thermal mass with U-values of 1.25 W/m(2)K, single glazing), which represents the majority in the country, while the second is a High-Energy-Performance building (with U-values of 0.35 W/m(2)K, double glazing), representing the pilot project called ECO-BAT. Three of Algeria\&$\#$39;s regions were considered to evaluate the climatic effect of solar systems integration. Algiers represents the coastal region; Djelfa, the highlands region; Tamanrasset, the Sahara region. In parametric study, two solar collectors\&$\#$39; field parameters were analysed, including the surface area and the tilt angle. The results indicated that building loads are significantly reduced (12\%, 44\% and 22\% for Algiers, Djelfa and Tamanrasset, respectively). The solar energy contribution is more than 60\% for all cases, a significant contribution for an efficient building. In all cases, we observed that the solar fraction reaches more than 45\% when the optimum parameters of the solar system are selected.

}, author = {S. BAHRIA and M. AMIRAT and A. HAMIDAT and M. EL-GANAOUI and M.E. SLIMANI} } @article {1610, title = { Performance of silica gel-water solar adsorption cooling system }, journal = { CASE STUDIES IN THERMAL ENGINEERING }, volume = {8}, year = {2016}, pages = {337-345}, abstract = {

The technology of cold production by adsorption is an effective way of heat conversion. It can significantly improve energy efficiency and reduce environmental pollution. For this purpose, an experimental platform has been developed combining an internal combustion gas engine (cogenerator), a refrigerating adsorption machine, thermal solar collectors and wooden construction split in two compartment, a cold one conditioned by cooling ceilings and a hot one conditioned by heating floors. The platform is completely instrumented. We developed a simulation model that is confronted to experimental measurements. This paper deals with numerical study of refrigeration systems with silica gel / water pair with SIMULINK. The results include the total solar radiation, the temperature profiles of hot, cooling and chilled water in addition to Temperature profiles of cogenerator and room.

}, author = {G. NAJEH and G. SLIMANE and M. SOUAD and B. RIAD and M. EL-GANAOUI} } @article {1650, title = { PERMEABILITY IDENTIFICATION FOR A FIBER-REINFORCED COMPOSITE BY INVERSE ANALYSIS }, journal = { COMPOSITES-MECHANICS COMPUTATIONS APPLICATIONS }, volume = {7}, year = {2016}, pages = {81-93}, abstract = {

The permeability of textile reinforcements is a crucial input to the simulation of a composite material process. In this paper, we present an accurate simulation approach for identifying fiber reinforcement permeability in the resin transfer moulding (RTM) process. The Gauss-Newton-Levenberg-Marquardt method was utilized to identify the permeabilities of fibrous reinforcement. Knowing the boundary conditions, the permeability can be deduced from pressure values at some given positions through the part. Starting from the initial estimate of permeability, the inverse method begins by solving the direct problem. The solution gives the pressure field everywhere in a composite sample. The calculated pressure field is then compared with an analytical pressure based on a criterion. The permeability is modified iteratively so as to minimize this criterion until the desired accuracy is achieved. A comparison between experimental and the computed parameters is used as convergence criteria in the iterative inverse technique, and good agreement is found.

}, author = {A. SAAD and A. ECHCHELH and M. HATTABI and M. EL-GANAOUI and M. AHD} } @article {1632, title = { Physical incorporation of particles in a porous media: a path to a smart wood }, journal = { EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS }, volume = {74}, year = {2016}, abstract = {

The aim of this work is to develop a functional wood incorporating, in its surface, physical and chemical properties that meet society demand. For instance: fire resistance, magnetic electrical conduction (metal-wood particles), antibacterial reaction (copper-wood), anti-pollution (zeolite-wood), dry coloring, reflective effects (minerals-wood). As part of the research on wooden materials, the technique of \"JAZOLTHOP(1)\" driving micrometric particles before combining them and moving in supersonic speeds was used in the framework of enriching a wooden substrate. Various tests were conducted on two wooden materials (fir and ash tree) submitted to four typologies of particles (steel shot, garnet, corundum and glass beads). The surfaces of the test samples were machined beforehand for a use of conventional smooth quality, thus defining a reference surface before incorporation. The enriched samples were characterized by using two optical techniques; firstly a surface technique through macroscopy Leica 110X ZP, then a volume technique through tomography(2). Subsequently, volume simulations (wood-inclusions) were implemented to study the thermal transfer. The obtained results showcase the existence of certain set conditions to reach the critical fluency of incorporation and to localize the enrichment on a parallel plan to the sample surface. The results show also the influence of particles concentration and the kind of the chosen wood on the final composite matrix/particle media.

}, author = {A. ZERRIAA and M. EL-GANAOUI and C. GERARDIN and A. TAZIBT and S. GABSI} } @article {1649, title = { Scrutiny of spray jet and impact characteristics under dispersion effects of powder injection parameters in APS process }, journal = { INTERNATIONAL JOURNAL OF THERMAL SCIENCES }, volume = {100}, year = {2016}, pages = {229-239}, abstract = {

This study aims to analyse axisymmetric turbulent argon plasma jet charged with particle/droplet stream and its impact characteristics during atmospheric spraying process. The governing partial differential equations are solved using a double population lattice Boltzmann (LB) numerical model (D2Q9-D2Q4) coupled LES turbulence model. The powder dynamics and heating were modeled using a Lagrangian plasma particles interaction model. A validation of the developed LB model on argon plasma jet was done, leading to credible results and the focus was thus mainly made on the plasma particle exchanges during the powder journey in argon plasma. The effects of injection conditions on the spray stream of molten particles and the particles impacting conditions (velocity, temperature, melting rate, ...) are carried out for four selected operating parameters, i.e. particle diameter, injection velocity, injection position (along injector section) and the injection angle at the injector exit. It has been observed that the LB method is a powerful tool for investigating plasma jet flows. It was concluded through the tracking model of the micro-sized particles that the present LB-based results agree well with the FD-based results and that the spray stream depends strongly on the studied injections conditions. Besides, the splashing phenomenon is found to be a rule governing particle/droplet impact behaviors.

}, author = {R. DJEBALI and M. EL-GANAOUI and A. JAOUABI and B. PATEYRON} } @article {1631, title = { Thermofluid effect on energy storage in fluidized bed reactor }, journal = { EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS }, volume = {74}, year = {2016}, abstract = {

The development of innovative systems of heat storage is imperative to improve the efficiency of the existing systems used in the thermal solar energy applications. Several techniques were developed and realized in this context. The technology of the sand fluidized bed (sandTES) offers a promising alternative to the current state-of-the-art of the heat storage systems, such as fixed bed using a storage materials, as sand, ceramic, and stones, etc. Indeed, the use of the fluidization technique allows an effective heat transfer to the solid particles. With the sand, an important capacity of storage is obtained by an economic and ecological material [N. Mahfoudi, A. Moummi, M. El Ganaoui, Appl. Mech. Mater. 621, 214 (2014); N. Mahfoudi, A. Khachkouch, A. Moummi B. Benhaoua, M. El Ganaoui, Mech. Ind. 16, 411 (2015); N. Mahfoudi, A. Moummi, M. El Ganaoui, F. Mnasri, K. M. Aboudou, 3(e) Colloque internationale Francophone d\&$\#$39; energetique et mecanique, Comores, 2014, p. 91]. This paper presents a CFD simulation of the hydrodynamics and the thermal transient behavior of a fluidized bed reactor of sand, to determine the characteristics of storage. The simulation shows a symmetry breaking that occurs and gave way to chaotic transient generation of bubble formation after 3 s. Furthermore, the predicted average temperature of the solid phase (sand) increases gradually versus the time with a gain of 1 degrees C in an interval of 10 s.

}, author = {N. MAHFOUDI and M. EL-GANAOUI and A. MOUMMI} } @article {1574, title = { Analytical and numerical solution to the convection problem in a shallow cavity filled with two immiscible superposed fluids }, journal = { INTERNATIONAL JOURNAL OF THERMAL SCIENCES }, volume = {90}, year = {2015}, pages = {303-310}, abstract = {

Natural convection, in a shallow horizontal cavity filled with two layers immiscible fluids, is studied both numeric and analytic. The horizontal walls of the enclosure are heated by the bottom and cooled by the upper by a uniform heat fluxes while the verticals one are subject to heat fluxes of variable intensity. The analytical solution, based on the parallel flow approximation, is found to be in good agreement with a numerical solution. The existence of both natural and antinatural flows is demonstrated. Indeed, the critical Rayleigh number for the onset of motion is dependent on the side heating intensity. In the case where the upper fluid is more viscous than the bottom one, multiple solutions are possible as well as the a steady states in a range of ratio of the viscosity of the fluids. The fact that one of the two fluids is more heat conductive, affect not only heat transfer generated but also the intensity of flows and the existence of the third cell where we found several solutions. The present model yields explicitly the flow patterns and Nusselt numbers in terms of the governing parameters of the problem.

}, url = {https://hal.univ-lorraine.fr/hal-01597079}, author = {F.S. OUESLATI and R. BENNACER and M. EL-GANAOUI} } @article {1585, title = { Design and characterization of a portable heat storage facility }, journal = { MECHANICS \& INDUSTRY }, volume = {16}, year = {2015}, abstract = {

This paper deals with the experimental investigation of transient behavior and thermal storage capability of a sensible heat storage unit. The former is designed to store solar energy by using sand as a storage medium. A cubic unit has been designed employing three configurations of embedded charging tubes to study the performances of the system. The storage material used in this experimentation (sand) has been characterized by its, grain size, density, and heat capacity. Performances of the thermal storage bed (including charging time, energy stored rate, charging energy efficiency) have been evaluated for selecting the storage material. From our experiments, we found that the number of charging tubes affects significantly the storage performances.

}, author = {N. MAHFOUDI and A. KHACHKOUCH and A. MOUMMI and B. BENHAOUA and M. EL-GANAOUI} } @article {1248, title = {Low-pressure superheated steam drying of a porous media and the inversion temperature.}, journal = {Drying Technology: an International Journal}, volume = {33}, year = {2015}, month = {2015}, chapter = {111}, url = {https://hal.univ-lorraine.fr/hal-01599789}, author = {S. MESSAI and J. SGHAIER and L. CHRUSCIEL and M. EL-GANAOUI and S. GABSI} } @article {1550, title = {MHD mixed convection and entropy generation of a nanofluid in a vertical porous channel}, journal = { COMPUTERS \& FLUIDS }, volume = {121}, year = {2015}, pages = {164-179}, abstract = {

A numerical study of entropy generation and MHD mixed convection flow of a nanofluid in a vertical porous channel is made. The left plate is thermally insulated, whereas four discrete heat sources dissipating a uniform heat flux are mounted on the right wall which is adiabatic elsewhere. Both assisting and opposing flows are considered. The Darcy-Brinkman-Forchheimer model with the Boussinesq approximation is adopted and the finite volume method is used to solve the governing equations with the appropriate boundary conditions. The influence of the magnetic field strength (Hartmann number), Joule heating effect (Eckert number), buoyancy force intensity (Richardson number), nanoparticles volume fraction, as well as porous medium permeability (Darcy number) on velocity profiles, isotherms, isentropic lines, global Nusselt number and total entropy generation are analyzed. The results showed an enhancement on heat transfer rate by using a porous medium, a nanofluid, a magnetic field without taking into account the Joule heating and when mixed convection is assisted. Globally, entropy generation increases with the parameters cited above.

}, url = {https://hal.univ-lorraine.fr/hal-01599798}, author = {I. FERSADOU and H. KAHALERRAS and M. EL-GANAOUI} } @article {1583, title = { NUMERICAL INVESTIGATION OF HEAT TRANSFER DURING SOLIDIFICATION IN A RECTANGULAR ENCLOSURE WITH INTERNALLY HORIZONTAL PARTIAL FINS}, journal = { COMPUTATIONAL THERMAL SCIENCES }, volume = {7}, year = {2015}, pages = {293-312}, abstract = {

The paper aims to investigate numerically the thermal and flow characteristics of an internally finned rectangular enclosure during the solidification process of a superheated phase change material (PCM). This work is motivated by the need to intensify heat transfer and accelerate the discharge process in latent heat storage units. A mathematical model is developed and a fixed-grid enthalpy formulation is adopted for modeling the solidification process coupling with convection-conduction heat transfer. The finite volume method was used for discretization. The obtained numerical results are compared with experimental and numerical ones found in the literature and reasonable agreement is obtained. Numerical investigations were carried out to evaluate the effects of the aspect ratios of the rectangular enclosure, A, and fins, A(f), on the heat transfer enhancement, by keeping the mass of the PCM and fins constant. Solutions are obtained for aspect ratios A (ranging from 3 to 8) and A(f) (ranging from 2.69 to 13.89). A comparative study of finned and unfinned enclosures shows clearly that introducing fins weakens the undesirable natural convection, improves the nondimensional rate of heat extraction, and assures rapid solidification. Results indicate that for an aspect ratio A = 4 and in the range of the aspect ratio A(f) explored in this study, the nondimensional solidification time is reduced by 17.74\%. The results also reveal that for a fin aspect ratio of A(f) = 5, the nondimensional solidification time is reduced by 49.48\% when the aspect ratio of the enclosure, A, varies from 3 to 8.

}, url = {https://hal.univ-lorraine.fr/hal-01599785}, author = {L. KHATRA and H. EL-QARNIA and M. EL-GANAOUI and E. LAKHAL} } @article {1260, title = {Numerical modelling of 3D dowelled timber joints using advanced fully coupled hydro-mechanical constitutive equations }, journal = {Mechanics and Industry}, year = {2015}, author = {M. KHELIFA and A. KHENNANE and M. EL-GANAOUI and A. CELZARD} } @article {1594, title = { Numerical Simulation of Entropy Generation in Hydrogen-Air Burner }, journal = { FDMP-FLUID DYNAMICS \& MATERIALS PROCESSING }, volume = {11}, year = {2015}, pages = {342-353}, abstract = {

The aim of this work is the numerical simulation of the combustion of hydrogen with air in a burner and the numerical solution of local entropy generation rate in the combustion chamber. The effects of equivalence ratio phi and oxygen percentage. on combustion and entropy generation rates are studied for different f(ranging from 0 to 1.0) and. values (ranging from 10 to 30\%). The predictions show that the increase of f (or the decrease of.) reduces notably the reaction rate levels. The equations of continuity, of energy and momentum are solved by volume finite using commercial code CFD Fluent, the effects of turbulence will be modeled by the RNG-K-epsilon model, on the other hand the generation of the entropy will be introduced in post-processing.

}, author = {S. MORSLI and A. SABEUR and M. EL-GANAOUI} } @article {1587, title = { NUMERICAL STUDY OF THE SPREADING AND SOLIDIFICATION OF A MOLTEN PARTICLE IMPACTING ONTO A RIGID SUBSTRATE UNDER PLASMA SPRAYING CONDITIONS }, journal = { THERMAL SCIENCE }, volume = {19}, year = {2015}, pages = {277-284}, abstract = {

This paper deals with simulation of the spreading and solidification of a fully molten particle impacting onto a preheated substrate under traditional plasma spraying conditions. The multiphase problem governing equations of mass, momentum and energy conservation taking into account heat transfer by conduction, convection, and phase change are solved by using a finite element approach. The interface between molten particle and surrounding air, is tracked using the Level Set method. The effect of the Reynolds number on the droplet spreading and solidification, using a wide range of impact velocities (40-250 m/s), is reported. A new correlation that predicts the final spread factor of splat as a function of Reynolds number is obtained. Thermal contact resistance, viscous dissipation, wettability and surface tension forces effects are taken into account.

}, url = {https://hal.univ-lorraine.fr/LERMAB-UL/hal-01592092}, author = {S. OUKACH and H. HAMDI and M. EL-GANAOUI and B. PATEYRON} } @article {1584, title = { RANZ AND MARSHALL CORRELATIONS LIMITS ON HEAT FLOW BETWEEN A SPHERE AND ITS SURROUNDING GAS AT HIGH TEMPERATURE }, journal = { THERMAL SCIENCE }, volume = {19}, year = {2015}, pages = {1521-1528}, abstract = {

Direct numerical simulations for axisymmetric plasma jet are developed to investigate particle plasma spraying process. In this paper we study the plasma jet and we focus mainly on the plasma-particle exchanges. Finite element analysis employing COMSOL multiphysics software is used in this simulation. Finally, comparisons are made with the numerically observed particle Nusselt\&$\#$39;s numbers and theoretically predicted Nusselt\&$\#$39;s numbers based on the Ranz and Marshall correlation. The results agree well with those obtained previously.

}, url = {https://hal.univ-lorraine.fr/LERMAB-UL/hal-01599788}, author = {A. AISSA and M. ABDELOUAHAB and A. NOUREDDINE and M. EL-GANAOUI and B. PATEYRON} } @article {1290, title = {Analytical and numerical solution to the convection problem in a shallow cavity filled with two immiscible superposed fluids}, journal = {International Journal of Thermal Sciences}, volume = {90}, year = {2014}, month = {2014}, chapter = {303}, author = {S. FAKHREDDINE and S. OUESLATI and R. BANNACER and M. EL-GANAOUI} } @article {1243, title = {Comparison of 1D and 2D models predicting a packed bed drying }, journal = {Int. J. Multisci. Des Optim. }, volume = {5}, year = {2014}, month = {2014}, author = {S. MESSAI and M. EL-GANAOUI and J. SGHAIER and L. CHRUSCIEL and S. GABSI} } @article {1288, title = {Effect of double thermal modulation on heat transfer in a square cavity heated from bellow}, journal = {Engineering Solid Mechanics}, volume = {2}, year = {2014}, month = {2014}, chapter = {139}, author = {A. AKHIATE and A. SEMMA and M. EL-GANAOUI and A. ANOUAR} } @article {1223, title = {Energy Tri-generation : combined gas cogeneration/Solar Cooling}, journal = {International Journal of Thermal and Environmental Engineering}, volume = {7}, year = {2014}, month = {2014}, chapter = {79}, author = {BENELMIR, R. and N. GHILEN and M. EL-GANAOUI and D. DESCIEUX and S. GABSI} } @article {1292, title = {The identification of effective thermal conductivity for fibrous reinforcement composite by inverse method}, journal = {Journal of Reinforced Plastics and Composites}, volume = {33}, year = {2014}, month = {2014}, chapter = {2183}, author = {A. SAAD and A. ECHCHELH and M. HATTABI and M. EL-GANAOUI} } @article {1294, title = {Numerical investigation of diffusion turbulent propane/air flame}, journal = {Energy, Environment, Biology and Biomedicine}, year = {2014}, month = {2014}, author = {S. MORSLI and M. EL-GANAOUI and A. SABEUR-BENDEHINA} } @article {1293, title = {Numerical simulation of vertical Bridgman solidification of CdZnTe}, journal = {International Journal for Simulation and Multidisciplinary Design Optimization}, volume = {A23}, year = {2014}, month = {2014}, author = {H. JAMAI and B. PATEYRON and H. SAMMOUDA and M. EL-GANAOUI} } @article {1291, title = {Sand as a heat storage media for a solar application : simumation results}, journal = {Applied Mechanics and Materials}, volume = {621}, year = {2014}, month = {2014}, chapter = {214}, author = {N. MAHFOUDI and A. MOUMMI and M. EL-GANAOUI} } @article {1295, title = {Simulation of hydrogen absorption in a magnesium hybride tank}, journal = {Fluid Dynamics \& Materials Processing}, volume = {10}, year = {2014}, month = {2014}, chapter = {149}, author = {K. LAHMER and R. BESSA{\"I}H and A. SCIPIONI and M. EL-GANAOUI} } @article {1289, title = {Technology Platform ENERBAT {\textendash} Gas cogeneration, Solar heating and cooling.}, journal = {International Journal of Thermal \& Environmental Engineering}, volume = {7}, year = {2014}, month = {2014}, chapter = {79}, author = {BENELMIR, R. and N. GHILEN and M. EL-GANAOUI and D. DESCIEUX and S. GABSI} } @article {1281, title = {From the guest editors of part one analytical methods to non-linear heat transfer and diffusion.}, journal = {Thermal Science}, volume = {17}, year = {2013}, month = {2013}, chapter = {9}, author = {J. HRISTOV and M. EL-GANAOUI} } @article {1280, title = {A lattice Boltzmann based investigation of powder in-flight characteristics during APS process, Part II : Effects of parameter dispersions at powder injection. }, journal = {Surface \& Coatings Technology}, volume = {220}, year = {2013}, month = {2013}, chapter = {157}, author = {R. DJEBALI and B. PATEYRON and M. EL-GANAOUI} } @article {1285, title = {Modeling of nonlinear wooedn columns reinforced by carbon fiber}, journal = {M{\'e}canique \& Industries}, volume = {14}, year = {2013}, month = {2013}, chapter = {219}, author = {F. BENTAYEB and I. TAVAKOLI-GHEYNANI and M. EL-GANAOUI and A. BOUALIA and M. KHELIFA} } @article {1287, title = {A new model for the simulation and improvement of resin transfer molding process}, journal = {Process research on Precision Instrument and Machinery}, volume = {2}, year = {2013}, month = {2013}, author = {A. SAAD and A. ECHCHELH and M. HATTABI and M. EL-GANAOUI} } @article {1283, title = {Numerical study of the spreading and solidification of a molten particle impacting onto a rigid substrate under plasma spraying conditions}, journal = {Thermal Science}, year = {2013}, month = {2013}, author = {S. OUKACH and H. HAMDI and M. EL-GANAOUI and B. PATEYRON} } @article {1286, title = {Pseudo-bond graph model for the analysis of the thermal behavior of buildings thermal science.}, journal = {Journal of Thermal Science}, volume = {17}, year = {2013}, month = {2013}, chapter = {723}, author = {A. Merabtine and R. Benelmir and M. EL-GANAOUI} } @article {1284, title = {Thermal impedance estimations by semi-derivatives and semi-integrals 1-D semi-infinite cases}, journal = {Thermal Science}, volume = {17}, year = {2013}, month = {2013}, chapter = {581}, author = {J. HRISTOV and M. EL-GANAOUI} } @article {1282, title = {Thermo-mechanical modeling of the splat formation in plasma spray conditions}, journal = {Physical and Chemical News}, volume = {67}, year = {2013}, month = {2013}, chapter = {113}, author = {S. OUKACH and H. HAMDI and M. EL-GANAOUI and B. PATEYRON} } @article {1276, title = {A 2D LATTICE Boltzmann full analysis of MHD convective heat transfer in saturated porous square enclosure}, journal = {CMES Tech. Science Press}, volume = {84}, year = {2012}, month = {2012}, chapter = {499}, author = {R. DJEBALI and M. EL-GANAOUI and T. NAFFOUTI} } @article {1279, title = {Analytical and innovative solutions for heat transfer problems involving phase change and interfaces. }, journal = {Comptes Rendus M{\'e}canique}, volume = {340}, year = {2012}, month = {2012}, chapter = {463}, author = {M. EL-GANAOUI and J. HRISTOV and M. LACROIX} } @article {1278, title = {Analytical computation of transient heat transfer and macro-constriction resistance applied to thermal spraying processes}, journal = {Comptes Rendus M{\'e}canique}, volume = {340}, year = {2012}, month = {2012}, chapter = {536}, author = {N. LARAQI and M. EL-GANAOUI} } @article {1277, title = {Effect of thermal contact resistance on alumina molten particle impacting onto a metal substrate.}, journal = {Defect and Diffusion forum}, volume = {326-328}, year = {2012}, month = {2012}, chapter = {482}, author = {S. OUKACH and B. PATEYRON and H. HAMDI and M. EL-GANAOUI} } @article {584, title = {Fluidisation de particules de bois en lit mixte~: faisabilit{\'e} et contr{\^o}le du proc{\'e}d{\'e}}, journal = {Mechanics \& Industry}, volume = {13}, year = {2012}, month = {2012}, chapter = {69-76}, author = {J.L. TANGUIER and R. Benelmir and M. EL-GANAOUI} } @article {730, title = {Assessment and computational improvement of thermal lattice Boltzmann models based Benchmark computations.}, journal = {CMES: Computer Modeling in Engineering \& Science}, volume = {71}, year = {2011}, month = {2011}, chapter = {179-202}, author = {R. DJEBALI and M. EL-GANAOUI} } @article {727, title = {An improved computational method for non isothermal resin transfer moulding simulation}, journal = {Thermal Science}, volume = {15}, year = {2011}, month = {2011}, chapter = {275-289}, author = {S.A. ECHCHELH and M. HATTABI and M. EL-GANAOUI} } @article {729, title = {Improvement of a flow tracking method applied to resin transfer moulding simulation}, journal = {Phys. Chem. News}, volume = {57}, year = {2011}, month = {2011}, chapter = {85-94}, author = {S.A. ECHCHELH and M. HATTABI and M. EL-GANAOUI} } @article {731, title = {Simulation and modeling of turbulent plasma jet based on axisymetric LBGK model}, journal = {Defect and Diffusion Forum}, volume = {312-315}, year = {2011}, month = {2011}, chapter = {1167-1171}, author = {R. DJEBALI and M. EL-GANAOUI and B. PATEYRON and H. SAMMOUDA} }