@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 {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 {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} }