Key words: Numerical method, Soret effect, entropy generation, porous medium, cavity, double diffusive convection.

Abstract: This paper consists of a numerical investigation about the influence of Soret effect on entropy generation in double diffusive convection. It consists of a square porous Darcy – Brinkman cavity saturated by a binary perfect gas mixture and submitted to horizontal thermal and concentration gradients. The Control Volume Finite-Element Method was employed in order to solve the set of equations describing the studied phenomena. Influence of the Soret effect on the different irreversibilities was carried out by the variation of the thermal diffusion ratio and the Darcy number. Taking into consideration the Soret effect induces an increase of heat transfer and viscous irreversibilities. The diffusive entropy generation presents different behaviours.