@article {1862, title = { Numerical analysis and validation of a natural convection mix-mode solar dryer for drying red chilli under variable conditions }, journal = { RENEWABLE ENERGY }, volume = {151}, year = {2020}, pages = {659-673}, abstract = {

The objective of this paper is to model a natural convection mix-mode solar dryer (NCMMSD) for drying agricultural products in an environment with short sunshine duration. The solar dryer was used to dry red chilli and was operating under the climate of the coastal area of South Eastern Nigeria characterized by low solar radiation intensity with a short duration of sunshine hours. The model took into consideration the thermophysical properties of the drying air and dried red chilli. The simultaneous heat and mass transfer equations were solved using the fourth-order Runge-Kutha method. The numerical solution allows for the determination of temperature and relative humidity of drying air at different points within the dryer as well as the moisture profile of the dried product. The experimental values of moisture ratios, temperature, and relative humidity during the mix-mode solar drying process with and without NaCl were used to validate the proposed model. Numerical simulation results were in close agreement with experimental results. The present model can serve as good reference bases to explain the drying phenomenon of mix-mode solar drying of other agricultural products when necessary thermophysical properties of these products are known. Using this model, the potential of mitigating gross fossil (coal) CO2 in Africa is annually estimated to 1280148 tons of CO2.

}, url = {https://hal.archives-ouvertes.fr/hal-02521198/}, author = {M. SIMO-TAGNE and M.C. NDUKWU and A. ZOULALIAN and L. BENNAMOUN and F. KIFANI-SAHBAN and Y. ROGAUME} } @article {1845, title = { Towards experimental and numerical assessment of the vibrational serviceability comfort of adhesive free laminated timber beams and CLT panels assembled using compressed wood dowels }, journal = { ENGINEERING STRUCTURES }, volume = {216}, year = {2020}, abstract = {

This paper presents experimental and numerical investigations on the vibrational serviceability performance of novel adhesive free engineered wood products (AFEWPs), namely adhesive free laminated timber beams (AFLB) and adhesive free cross-laminated timber panels (AFCLT), assembled through thermo-mechanically compressed wood dowels (CWD). The laminations composing the AFEWPs are made of oak timber while the CWD are made of spruce. The experimental modal analyses were carried out under free-free conditions using a hammer impact. Natural frequencies, mode shapes, and damping ratios were assessed experimentally. In addition, similar glued beams made of oak timber (conventional glulam) were manufactured and tested for comparison purpose. A predictive 3D FE model was developed and validated by comparison against experimental data and then used to predict the vibrational behavior of a realistic flooring system made with AFCLT panel and measuring 4.5 m x 5.5 m. The predicted FE results were discussed with regard to the Eurocode 5 vibrational serviceability design requirements showing acceptable vibrational performance. The variability level of the results for the AFEWPs is also studied and discussed.

}, author = {T.A. BUI and M. OUDJENE and P. LARDEUR and M. KHELIFA and Y. ROGAUME} } @article {1807, title = { Convective drying of onion: modeling of drying kinetics parameters }, journal = { JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE }, volume = {56}, year = {2019}, pages = {3347-3354}, abstract = {

Drying is a simultaneous heat and mass transfer processes. Drying kinetics is determined by both internal properties and external drying conditions. In this study, two important drying kinetics parameters of onions i.e. effective water diffusivity and relative activation energy of reaction engineering approach (REA) are determined. The generated parameters are used to model thin layer drying of onion at different temperatures (40, 50, 60, and 70 degrees C) and relative humidity of 20\%. The effective water diffusivity is in the range of 2.8x10(-10)m(2)s(-1) and 8.1x10(-10)m(2)s(-1). Unlike the diffusivity, the relative activation energy of the REA is independent on drying conditions and thus the latter approach requires less effort in generating the transport properties. The transport parameters can be applied for assisting in designing dryer units and evaluating the performance of existing dryer units.

}, author = {A. COMPAORE and A. PUTRANTO and A.O. DISSA and S. OUOBA and R. REMOND and Y. ROGAUME and A. ZOULALIAN and A. BERE and J. KOULIDIATI} } @article {1803, title = { Determination and modeling of the isotherms of adsorption/desorption and thermodynamic properties of obeche and lotofa using nelson{\textquoteright}s sorption model }, journal = { HEAT AND MASS TRANSFER }, volume = {55}, year = {2019}, pages = {2185-2197}, abstract = {

Equilibrium moisture content (EMC), net isosteric heat of sorption (NIHS), net entropy of sorption (NES) and standard free energy of Gibbs (SFEG) of Triplochiton scleroxylon (obeche) and Sterculia rhinopetala (lotofa) are modeled using Nelson\&$\#$39;s sorption isotherm model. Experimental data are determined using a dynamic vapor sorption apparatus. Air relative humidity is ranged from 0 to 90\% and two air temperatures (20 degrees C and 40 degrees C) are used. Experimental data of EMCs obtained from adsorption and desorption for the mentioned woods were compared with the predicted results using Nelson\&$\#$39;s sorption model by the application of the same operating conditions (i.e. temperatures and relative humidity conditions). The results showed that the predicted ones were in good agreement with the experimental data, when the relative humidity varied from 1.2 to 90\%. Both adsorption and desorption phase presented a mean relative errors value inferior to 6.3\%. The parameters that define the sorption isotherm varied with the wood type and the sorption mode. Thus, Nelson\&$\#$39;s sorption isotherm model is a useful tool that can be used for prediction of the moisture change in wood under different environmental conditions and for predicting indirectly the thermodynamic parameters such as NIHS, NES and SFEG. In adsorption and desorption mode, the NIHS are estimated using Clausius-Clapeyron\&$\#$39;s equation. The desorption values were higher than the adsorption ones. NIHS versus EMC varied exponentially and the parameters of the function were presented variable with the sorption mode and the wood type. The total energy that we needed to extract and evaporate all bounded water is 12,398.6 J/mol for obeche and 11,627.7J/mol for lotofa. The total energy that we needed to condense and fix all bounded water taken from the state vapour is 11,829.34 J/mol for obeche and 11,379.39 J/mol for lotofa. Water molecules are more mobile during desorption than adsorption in the case of obeche. In the case of lotofa, these molecules are more mobile during adsorption. SFEG is higher in desorption than adsorption and it is influenced by species and less by the temperature. When the temperature increased, the SFEG increased as well. At low values of EMC, NIHS and SFEG are higher and decreased with the increase of EMC until reaching the fibre saturation point.

}, url = {https://hal.archives-ouvertes.fr/hal-02521244/}, author = {M. SIMO-TAGNE and L. BENNAMOUN and A. LEONARD and Y. ROGAUME} } @article {1829, title = { Effect of combustion technology and biogenic CO2 impact factor on global warming potential of wood-to-heat chains }, journal = { APPLIED ENERGY }, volume = {235}, year = {2019}, pages = {1381-1388}, abstract = {

In this work wood-to-heat chains are assessed on environmental and micro-economical aspects. Wood combustion produced various minor pollutants, which should be considered in life cycle assessment For this purpose different wood combustion processes have been modeled under Aspen Plus (R) software in order to assess pollutant emissions (CO2, aromatic compounds, CO, etc.) based on industrial emission data and therefore to obtain a rigorous life cycle inventory. Different technologies are assessed for a fixed heating demand and hot water production of a typical French house: district heating fueled by wood chips, individual stoves or boilers fueled by wood logs or pellets. Electricity, natural gas, and fuel oil solutions complete the scenario set. The different heating solutions are compared in terms of their greenhouse gas emissions and of the cost of the final energy (including investment and operating costs). The important effect of minor pollutants (such as CO and volatile organic compounds) on the global warming potential of wood-to-heat chains is highlighted. The performance of wood scenarios compared to fossil-based ones is also highly dependent on the impact factor assumed for the biogenic CO2. The wood-based scenarios present a wide range of costs with pellet solutions being more expensive on investment and pellet production.

}, url = {https://hal.univ-lorraine.fr/hal-01935854}, author = {C. PELLETIER and Y. ROGAUME and L. DIECKHOFF and G. BARDEAU and M.N. PONS and A. DUFOUR} } @article {1789, title = { Experimental investigations on adhesive free laminated oak timber beams and timber-to-timber joints assembled using thermo-mechanically compressed wood dowels }, journal = { CONSTRUCTION AND BUILDING MATERIALS }, volume = {222}, year = {2019}, pages = {288-299}, abstract = {

This paper presents an experimental investigation on a novel adhesive free engineered Wood Products (AFEWPs) as an alternative to the conventional glued EWPs which have a high degree of petrochemicals. The research outcomes demonstrate the feasibility of using compressed wood dowels (CWD) as a joint element, to connect timber laminates and members as well as to substitute for adhesives and metallic fasteners. The paper describes the production of thermo-mechanically compressed wood dowels as well as the manufacturing of the dowelled timber specimens. The strength and stiffness properties of CWD are characterized based on three-point bending tests and compared to the values obtained from uncompressed wood specimens. After that, the paper discusses the relative mechanical performances of three-layer dowelled oak beams subjected to four-point bending, in comparison to their conventional glued counterparts. Finally, the paper shows results obtained from double shear push-out tests under both monotonic and cyclic loadings, using two wood species, namely spruce and oak. The obtained results show clearly the potential of thermo-mechanically compressed wood dowel, as a joint fastener, for load bearing capacity.

}, url = {https://hal.archives-ouvertes.fr/hal-02521217}, author = {I. EL-HOUJEYRI and V.D. THI and M. OUDJENE and M. KHELIFA and Y. ROGAUME and A. SOTAYO and Z. GUAN} } @article {1788, title = { Modeling of coupled heat and mass transfer during drying of ebony wood using indirect natural convection solar dryer }, journal = { DRYING TECHNOLOGY }, volume = {37}, year = {2019}, pages = {1863-1878}, abstract = {

This study presented the behavior of a laboratory scale solar dryer, which was designed with the objective of meeting the needs of low income carpenters of the tropical region of Africa. The following materials were used to build the solar dryer: aluminum sheets painted in black, a wooden support, and a plastic polyethylene used as a cover. Drying was carried out in the city of Yaounde in Cameroon, and the tested boards were ebony (Diospyros crassiflora). Drying must be performed with the following conditions: slow process at a low temperature in order to maintain the proper air relative humidity. Since, no apparatus was used to force the circulation of the air, natural convection was the mode used by the dryer. The solar dryer was mathematically modeled by applying heat and mass transfer balance to the different components of the solar dryer. It is important to mention that the used heat and mass coefficients were proposed as variable with the operating conditions. The mathematical model was a reasonable description of the physical phenomena taking place in the dryer. The results show that the average relative error between numerical and experimental moisture contents was equal to 2.102\%. Heat transfer convective coefficients and global mass transfer coefficients varied with drying time from 0.25 to 5.5 W/(m(2)K) and from 1 x 10(-8) to 5.5 x 10(-8) m/s, respectively. The proposed model allowed designing and dimensioning the solar dryer, to the industrial scale. It allowed following the evolution of the different temperatures and moisture content of the tested material and then optimizing the design of the dryer and the drying process conditions. Based on the model, proposing the opening of the drying chamber during the night time and the use of substances capable of retaining heat in the chamber were some proposed solutions in order to have more efficient drying process. The modeling results showed also that an improvement can be obtained at the addition of a solar collector.

}, url = {https://hal.archives-ouvertes.fr/hal-02521718/}, author = {M. SIMO-TAGNE and B. BONOMA and L. BENNAMOUN and L. MONKAM and A. LEONARD and A. ZOULALIAN and Y. ROGAUME} } @article {1786, title = { Modelling and numerical simulation of hygrothermal transfer through a building wall for locations subjected to outdoor conditions in Sub-Saharan Africa }, journal = { JOURNAL OF BUILDING ENGINEERING }, volume = {26}, year = {2019}, abstract = {

In the building sector, the improvement of the heat and mass insulation of the walls can reduce the values of the global energy demand and the CO2 emission. A coupled one-dimensional heat and mass transfer model through a building wall was proposed in this study. The governing equations integrate the influences of Dufour and Soret effects and are numerically resolved using FORTRAN 90 and finite difference method in Crank-Nicolson scheme. Gauss-Seidel relaxation iteration method is used in order to generate the numerical solutions. The accuracy of the model was evaluated with experimental data on wooden wall and concrete wall from literature. A very satisfactory agreement is noted between the numerical predictions, experimental observations and physical phenomenon obtained. The model was further used to simulate the hygrothermal transfer through five tropical woods used as building walls in sub-Saharan African region after integration of outdoor conditions. These five woods have densities ranging from 430 to 800 kg/m(3) and the conditions of the interior air were fixed to maintain a comfortable state for the occupants. Twelve towns located within latitudes 4.33 degrees S to 12.37 degrees N in Sub - Saharan Africa were used to discuss the results given by the model. At the end, influences of anatomical direction, tropical wood types, wall thickness, latitudes of the locations and solar radiation on evolutions of temperature and moisture content in the wall are studied. Our results showed that these parameters have significant effects on temperature and moisture content propagation within the wall. Using a wooden wall of 5 cm thickness, it is possible to reduce significantly the effect of the exterior heat.

}, url = {https://hal.archives-ouvertes.fr/hal-02521709/}, author = {M. SIMO-TAGNE and M.C. NDUKWU and Y. ROGAUME} } @article {1730, title = { A constitutive numerical modelling of hybrid-based timber beams with partial composite action }, journal = { CONSTRUCTION AND BUILDING MATERIALS }, volume = {178}, year = {2018}, pages = {462-472}, abstract = {

This work focuses on the development of a three dimensional constitutive model for timber to simulate the flexural behaviour of hybrid timber-steel and timber-concrete beams. This is motivated by the lack of dedicated non linear material behaviour laws for timber in the commercial finite element software by compared to the conventional materials such as concrete and steel.

The flexural behaviour of hybrid timber beams is very complex because of the combination of the two different material behaviours and their nonlinar and partial compostion action. Numerical simulation of such behaviour requires an accurate description of the nonlinear material behaviour, in particular that of timber because of its anisotropic nature. A realistic description of the material nonlinearities and of the composite action between the different materials could aid considerably in achieving acceptable predictions. An incremental approach based on the strong coupling between orthotropic elasticity, anisotropic plasticity with mixed nonlinear isotropic hardening and an isotropic damage is used. The developed constitutive model for timber is implemented in Abaqus code using an external subroutine. The 3D FE model is calibrated and validated through comparison with experimental data reported in literature. The model is able to predict the nonlinear structural response of hybrid beams in terms of load-midspan deflection, and provides an acceptable accuracy.

}, author = {T.T. TRAN and V.D. THI and M. KHELIFA and M. OUDJENE and Y. ROGAUME} } @article {1751, title = { Mathematical modelling and numerical simulation of a simple solar dryer for tropical wood using a collector }, journal = { APPLIED THERMAL ENGINEERING }, volume = {131}, year = {2018}, pages = {356-369}, abstract = {

The main objective of this paper is to develop a computational model and to simulate the drying of timber with a solar dryer. Two sets of equations have been established: one for the solar collector and the other for the drying chamber. The computed and measured outlet temperatures of the solar collector were compared. A very satisfactory prediction by the model is observed. The theoretical variations of the relative humidity and temperature of the air inside the drying chamber were computed and the analyses gave satisfactory physical meanings. The drying kinetic is a little faster. Using the solar collector, the final moisture content of the wood stack of iroko species (Chlorophora excelsa) is lower than the one obtained without utilization of the solar collector. The proposed modelling can be used to design and model other solar dryers.

}, url = {https://hal.archives-ouvertes.fr/hal-02521746}, author = {M. SIMO-TAGNE and A. ZOULALIAN and R. REMOND and Y. ROGAUME} } @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 {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 {1707, title = { MALDI-TOF, C-13 NMR and FTIR analysis of the cross-linking reaction of condensed tannins by triethyl phosphate }, journal = { INDUSTRIAL CROPS AND PRODUCTS }, volume = {95}, year = {2017}, pages = {621-631}, abstract = {

Reaction of condensation and cross-linking of catechin monomer as a model of condensed (flavonoid) tannin extracts and of mimosa tannin itself, as well as of resorcinol with triethyl phosphate (TEP) have been investigated. FTIR, solid state CP-MAS C-13 NMR, P-31 NMR and MALDI-ToF spectroscopy studies revealed that reaction occurs mainly on the C3 of the flavonoid heterocycle ring and on the aromatic C4\&$\#$39; and C5\&$\#$39; carbons of the flavonoids B-ring, while TEP does not appear to react on the A-ring. A difference in the relative proportions of these two reaction sites for tannin and catechin has been noticed. The reactions appear to be dependent on the temperature. According to the thermogravimetric analysis, materials obtained from the reaction of tannin with TEP showed high thermal stability.

}, author = {M.C. BASSO and A. PIZZI and J.P. MARIS and L. DELMOTTE and B. COLIN and Y. ROGAUME} } @article {1704, title = { MODELING AND SIMULATION OF AN INDUSTRIAL INDIRECT SOLAR DRYER FOR IROKO WOOD (Chlorophora excelsa) IN A TROPICAL ENVIRONMENT }, journal = { MADERAS-CIENCIA Y TECNOLOGIA }, volume = {19}, year = {2017}, pages = {95-112}, abstract = {

This paper presents a modeling of an instrumental indirect solar wood dryer less expensive functioning in a Cameroonian climate applied to the climate of Yaounde. The dryer is easy to build and electric energy is only used for the fan. Applications are done on Iroko wood (Chlorophora excelsa), a tropical wood 50mm thick most utilized in Africa. A satisfactory agreement between experimental and numerical results was found. Influences of thickness, wood initial water content and airflow rate were studied.

}, url = {https://hal.archives-ouvertes.fr/hal-02521823/}, author = {M. SIMO-TAGNE and A. ZOULALIAN and R. REMOND and Y. ROGAUME and B. BONOMA} } @article {1596, title = { Catalytic gasification of biomass (Miscanthus) enhanced by CO2 sorption }, journal = { ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH }, volume = {23}, year = {2016}, pages = {22253-22266}, abstract = {

The main objective of this work concerns the coupling of biomass gasification reaction and CO2 sorption. The study shows the feasibility to promote biomass steam gasification in a dense fluidized bed reactor with CO2 sorption to enhance tar removal and hydrogen production. It also proves the efficiency of CaO-Ca12Al14O33/olivine bi-functional materials to reduce heavy tar production. Experiments have been carried out in a fluidized bed gasifier using steam as the fluidizing medium to improve hydrogen production. Bed materials consisting of CaO-based oxide for CO2 sorption (CaO-Ca12Al14O33) deposited on olivine for tar reduction were synthesized, their structural and textural properties were characterized by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), and temperature-programmed reduction (TPR) methods, and the determination of their sorption capacity and stability analyzed by thermogravimetric analysis (TGA). It appears that this CaO-Ca12Al14O33/olivine sorbent/catalyst presents a good CO2 sorption stability (for seven cycles of carbonation/decarbonation). Compared to olivine and Fe/olivine in a fixed bed reactor for steam reforming of toluene chosen as tar model compound, it shows a better hydrogen production rate and a lower CO2 selectivity due to its sorption on the CaO phase. In the biomass steam gasification, the use of CaO-Ca12Al14O33/olivine as bed material at 700 A degrees C leads to a higher H-2 production than olivine at 800 A degrees C thanks to CO2 sorption. Similar tar concentration and lighter tar production (analyzed by HPLC/UV) are observed. At 700 A degrees C, sorbent addition allows to halve tar content and to eliminate the heaviest tars.

}, url = {https://hal.univ-lorraine.fr/hal-01518102}, author = {I. ZAMBONI and M. DEBAL and M. MATT and P. GIRODS and A. KIENNEMANN and Y. ROGAUME and C. COURSON} } @article {1651, title = { CHARACTERIZATION OF SORPTION BEHAVIOR AND MASS TRANSFER PROPERTIES OF FOUR CENTRAL AFRICA TROPICAL WOODS: AYOUS, SAPELE, FRAKE, LOTOFA }, journal = { MADERAS-CIENCIA Y TECNOLOGIA }, volume = {18}, year = {2016}, pages = {207-226}, abstract = {

This study provides the sorption isotherm, its hysteresis and their mass transfer properties of four Central Africa Tropical woods widely used for building construction: frake (Terminalia Superba), lotofa (Sterculia Rhinopetala), sapele (Entandrophragma Cylindricum) and ayous (Triplochiton Scleroxylon). Characterization of these four species in particular and Central Africa tropical woods in general were necessary to develop conservation and treatment of wood after first transformation using the drying. Also, moisture transport on wooden material used such as wall buildings can be facilitating to found the thermal comfort. Measurements of isotherms were performed using a dynamic vapor sorption apparatus (Surface Measurement Systems) at 20 and 40 degrees C with air relative humidity ranged from 0\% to 90\%. Mass diffusivity was determined in steady state using a specific vaporimeter. Air permeability was determined using a specialized device developed to measure over a wide range of permeability values. Permeability and mass transfer properties were determined in the tangential direction with a \"false\&$\#$39;\&$\#$39; quartersawn board (sapele and lotofa) and in the radial direction with a flatsawn board (ayous and frake). Samples of sapele, ayous and frake are heartwood when lotofa contains as well as heartwood than sapwood. Results obtained showed that the temperature effect on sorption behavior was quite low. We observed also a low difference between the sorption behavior of these different species and hysteresis of sorption decreases when temperature increases. Hailwood-Horrobin model\&$\#$39;s explains plausibly the experimental sorption isotherms data. Results on characterization of mass transfer properties showed that, in the steady state, mass diffusivity decreases exponentially when basal density increases. Mass diffusivity was higher in desorption than in adsorption phase. The gaseous permeability of these species was between than those of Australian hardwoods and temperate woods. It was difficult to define a relationship between permeability and mass diffusivity.

}, url = {https://hal-centralesupelec.archives-ouvertes.fr/hal-01378513}, author = {M. SIMO-TAGNE and R. REMOND and Y. ROGAUME and A. ZOULALIAN and P. PERRE} } @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 {1599, title = { Modeling, of coupled heat and mass transfer during drying of tropical woods }, journal = { INTERNATIONAL JOURNAL OF THERMAL SCIENCES }, volume = {109}, year = {2016}, pages = {299-308}, abstract = {

We have developed a model on drying of two tropical woods of ayous (Triplochiton Scleroxylon) and frake (Terminalia Superba) coming from Cameroon forests. Some thermophysical parameters used in the model were experimentally obtained in this work while the remaining properties were from literature. A comparison is doing between numerical results of our model, these given by the Luikov\&$\#$39;s model and experimental data. Numerical simulation results from the developed model give close agreement with experimental results. We note that Luikov\&$\#$39;s model not gives a satisfaction results in the non-hygroscopic domain in the case of frake. The present model can be used to explain the drying phenomenon of these two tropical species and can be applied to others species when necessary thermophysical parameters of these species are known. In a future work, it is important to integrate the influence of anatomical direction on our numerical and experimental results.

}, url = {https://hal.archives-ouvertes.fr/hal-02521993/}, author = {M. SIMO-TAGNE and R. REMOND and Y. ROGAUME and A. ZOULALIAN and B. BONOMA} } @article {1626, title = { SORPTION BEHAVIOR OF FOUR TROPICAL WOODS USING A DYNAMIC VAPOR SORPTION STANDARD ANALYSIS SYSTEM }, journal = { MADERAS-CIENCIA Y TECNOLOGIA }, volume = {18}, year = {2016}, pages = {403-412}, abstract = {

Sorption behavior of four tropical woods coming from Cameroon is studied using a Dynamic Vapor Sorption-Intrinsic apparatus. Sorption isotherms at 20 degrees C and 40 degrees C of Triplochiton scleroxylon (obeche), Entandrophragma cylindricum (sapele), Sterculia rhinopetala (lotofa) and Terminalia superba (frake also called limba) are compared to those in the literature with methods using saturated salts for lotofa and frake with satisfactory results. Experimental values are fitted using two sorption isotherm models. Sorption hysteresis is greatest in sapele and least in frake. When temperature increases, differences in the hysteresis of sorption among the woods decreases. Hystereses of all studied woods ranged from 0,5 to 3\%. Our studied woods have lower equilibrium moisture content probably caused by the higher values of extractives content. The water sorbed molecules on multilayer during both adsorption and desorption at 20 degrees C and 40 degrees C is greater in the case of frake and lower in the case of lotofa. The water sorbed molecules on multilayer of sapele is greater than those of obeche. The predominance of multilayer over monolayer of our woods is from 0,2 to 0,4 relative humidity in adsorption phase, and from 0,3 to 0,4 relative humidity in desorption phase.

}, url = {https://hal.archives-ouvertes.fr/hal-02521999/}, author = {M. SIMO-TAGNE and R. REMOND and Y. ROGAUME and A. ZOULALIAN and B. BONOMA} } @article {1569, title = { Segregation of wood particles in a bubbling fluidized bed }, journal = { FUEL PROCESSING TECHNOLOGY }, volume = {133}, year = {2015}, pages = {80-88}, abstract = {

Understanding wood segregation in bubbling fluidized beds is of importance for the global analysis, comprehensive modeling, and scale-up of bubbling fluidized bed biomass gasifiers. This study presents measurements of voidage and segregation taken during experiments in fluidized beds containing inert materials mixed with biomass particles, The features of the wood particles affect the bed axial homogeneity; a small particle size or a high density increase homogeneity. When gas fluidization velocity is low, the biomass particles are more segregated from olivine compared to the results achieved with larger velocities. In all experiments, a significant portion of the wood remains within the bed (50-80\%), while the rest of the biomass floats at the bed surface. The experimental modeling accurately represents the voidage of the bed, with the exception of the upper part of the bed and the floating portion of the biomass particles. The results of the present study are in agreement with recent publications.

}, url = {https://hal.univ-lorraine.fr/LERMAB-UL/hal-01250404}, author = {B. CLUET and G. MAUVIEL and Y. ROGAUME and O. AUTHIER and A. DELEBARRE} } @article {1216, title = {Analysis of the behaviour of multiple dowel connections in fire.}, journal = {Fire Safety Journal}, year = {2014}, month = {2014}, author = {M. KHELIFA and A. KHENNANE and M. El GANAOUI and Y. ROGAUME} } @article {1213, title = {CO2 adsorption capacities of active chars prepared from wood laminated flooring wate}, journal = {International Journal of Energy, Environment, and Economics}, year = {2014}, month = {2014}, author = {M. DEBAL and P. GIRODS and J. LEMONON and N. MEYER and C. TILLOY and A. DONNOT and Y. ROGAUME} } @article {1219, title = {Experimental characterization of particle evolution size and density by thermal treatment: application to DEM model of biomass pyrolysis.}, journal = {Journal of Analytical and Applied Pyrolysis}, year = {2014}, month = {2014}, author = {B. CADILLE and F. TOPIN and P. GIRODS and J. VICENTE and L. TADRIST and Y. ROGAUME} } @article {1215, title = {How to determine energy of wood from nutrient analysis? }, journal = {Chemical Engineering Transaction}, volume = {37}, year = {2014}, month = {2014}, chapter = {511}, author = {N. BILOT and L. SAINT-ANDRE and Y. ROGAUME and M. FOURNIER and C. DUPONT and C. DELEUZE} } @article {697, title = {Improving the Operation of an Automatic Wood Chip Boiler by Optimizing CO Emissions}, journal = {Energy \& Fuels}, volume = {28}, year = {2014}, month = {2014}, chapter = {2152-2159}, author = {A. QUINTERO-MARQUEZ and C. BERNARD and A. ZOULALIAN and Y. ROGAUME} } @article {1220, title = {Modeling and simulation of the drying of beech timber (Fagus Sylvatica) using oscillating regimes. }, journal = {International Journal of Thermal and Environmental Engineering}, volume = {8}, year = {2014}, month = {2014}, chapter = {83}, author = {M. SIMO-TAGNE and Y. ROGAUME and A. ZOULALIAN} } @article {1214, title = {Modeling of the coupled heat and mass transfer during the drying of the tropical woods coming from Cameroon : the cas of Lotofa and Sapelle. }, journal = {International Journal of Emerging Technology and Advanced Engineering. }, volume = {4}, year = {2014}, month = {2014}, chapter = {385}, author = {M. SIMO-TAGNE and R. REMOND and Y. ROGAUME and A. ZOULALIAN} } @article {1218, title = {Predicting higher heating values of wood from forest biomass nutrient content. }, journal = {Forest Ecology and Management }, year = {2014}, author = {N. BILOT and L. SAINT-ANDRE and Y. ROGAUME and C. BRECHET and L. AUGUSTO and C. DUPOND and G. BODINEAU and C. DELEUZE} } @article {1221, title = {Segregation of wood particles in a bubbling fuidized bed.}, journal = {Fuel Processing Technology}, volume = {133}, year = {2014}, month = {2014}, chapter = {80}, author = {B. CLUET and G. MAUVIEL and Y. ROGAUME and O. AUTHIER and A. DELABARRE} } @article {1217, title = {TG-FTIR kinetic study of the thermal cleaning of wood laminated flooring waste. }, journal = {Journal of Thermal Analysis and Calorimetry}, volume = {118}, year = {2014}, month = {2014}, chapter = {141}, author = {M. DEBAL and P. GIRODS and J. LEMONON and Y. ROGAUME} } @article {617, title = {Detailed process modeling of a wood gasification combined heat and power plant}, journal = { Biomass \& Bioenergy}, volume = {51}, year = {2013}, month = {2013}, chapter = {68-82}, author = {J. FRANCOIS and L. ABDELOUAHED and G. MAUVIEL and F. PATISSON and O. MIRGAUX and C. ROGAUME and Y. ROGAUME and M. FEIDT and A. DUFOUR} } @article {687, title = {Fast pressing composite using tannin-furfuryl alcohol resin and vegetal fibers reinforcement}, journal = { J.Renewable Mat.}, volume = {1}, year = {2013}, month = {2013}, chapter = {311-316}, author = {A. NICOLLIN and X. LI and P. GIRODS and A. PIZZI and Y. ROGAUME} } @article {616, title = {Formaldehyde and VOCs emissions from bio-particleboards}, journal = {Journal of Adhesion Science and Technology}, volume = {27}, year = {2013}, month = {2013}, chapter = {748-762}, author = {P. NAVARETTE and Z. KEBBI and F. MICHENOT and J. LEMONON and C. ROGAUME and E. MASSON and Y. ROGAUME and A. PIZZI} } @article {618, title = {Modeling of a Biomass Gasification CHP Plant: Influence of Various Parameters on Energetic and Exergetic Efficiencies}, journal = {Energy \& Fuels}, volume = {27}, year = {2013}, month = {2013}, chapter = {7398-7412}, author = {J. FRANCOIS and G. MAUVIEL and M. FEIDT and C. ROGAUME and Y. ROGAUME and O. MIRGAUX and F. PATISSON and A. DUFOUR} } @article {1211, title = {modeling of chloride of hydrogen and free chloride emission form thermal treatment of polyvinyl chloride (PVC) based plastic materials. }, journal = {Journal of Analytical and Applied Pyrolysis}, volume = {101}, year = {2013}, month = {2013}, chapter = {209}, author = {JPB. KARAMA and A. BERE and J. LEMONON and T. DAHO and A. DISSA and Y. ROGAUME and J. KOULIDIATI} } @article {628, title = {Nitrogen removal from wood laminated flooring waste by low-temperature pyrolysis.}, journal = {Waste Biomass Valor.}, year = {2013}, month = {2013}, author = {J. LEMONON and P. GIRODS and C. ROGAUME and A. ZOULALIAN and Y. ROGAUME and D. PERRIN} } @article {1212, title = {The fate of trace elements during the combustion of phytoremediation wood. }, journal = {Environmental Science and Technology}, volume = {46}, year = {2012}, month = {2012}, chapter = {13361}, author = {M. CHALOT and D. BLAUDEZ and Y. ROGAUME and A.S. PROVENT and C. PASCUAL} }