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Jamai H.,Laboratoire dEnergetique et des Transferts Thermique et Massique LETTM | Fakhreddine S.O.,Laboratoire dEnergetique et des Transferts Thermique et Massique LETTM | Sammouda H.,University of Sousse
Journal of Applied Fluid Mechanics | Year: 2014

In this paper we would like to present a numerical study of the effect of magnetic fields on natural convection (magneto-convection) flow of electrically conducting fluid. The 2D square cavity which was studied is subjected to a sinusoidal temperature conditions. The left and the right walls were respectively heated and cooled with a sinusoidal temperature while the top wall was kept thermally insulated. The equations are solved numerically by employing finite element method (MEF) using the software COMSOL Multiphysics. We presented the results in wide range of Hartmann number and Rayleigh number in terms of isotherm contours, velocities fields streamlines, and in an average and local Nusselt number which varies sinusoidally. Our results are shown to be in good conformity with the available benchmark solutions.

Lamloumi R.,Tunis el Manar University | Lamloumi R.,Laboratoire dEnergetique et des Transferts Thermique et Massique LETTM | Hassini L.,Tunis el Manar University | Hassini L.,Laboratoire dEnergetique et des Transferts Thermique et Massique LETTM | And 6 more authors.
Computers, Materials and Continua | Year: 2014

A mathematical model was developed to simulate in 2D the spatiotemporal evolution of the moisture content, the temperature and the mechanical stress within a deformable and saturated product during convective drying. A comprehensive hydro-thermal model had been merged with a Maxwell model with two branches, assuming a viscoelastic material, a plane deformation and an isotropic hydric-shrinkage of the sample. A long sample of clay mixture with a square section was chosen as an application case. The transport and equilibrium properties of the product required for the modeling were determined from previous experiments which were independent of the drying trials. In order to validate the hydro-thermal part of the model, several drying tests were carried out for different values of temperature, relative humidity and air velocity in a vertical drying tunnel (designed and constructed in the LETTM laboratory). The theoretical and experimental results appeared in good agreement. The simulations of the spatio-temporal distribution of mechanical stress were performed and interpreted in terms of product potential damage. The sample shape was also predicted all aver the drying process with reasonable accuracy. Copyright © 2014 Tech Science Press.

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