Key words: Numerical method, cavity, porous medium, heat and mass transfer, entropy generation, double diffusive convection.

Abstract: Entropy generation in double diffusive convection through a rectangular porous cavity saturated by a binary perfect gas mixture is numerically studied using Darcy – Brinkman formulation. The set of equation describing the phenomenon is solved by using a modified version of the Control Volume Finite-Element Method. Effect of the enclosure geometry on entropy generation was investigated. The results are numerically presented through graphs and maps to observe the effects of aspect ratio of the cavity on entropy generation for the two cases of opposite and cooperatives buoyancy forces.