SINOPSIS

The objective of the present work is to numerically study the Soret effect on entropy generation in a square porous cavity saturated by a binary perfect gas mixture and submitted to horizontal thermal and concentration gradients, using the Darcy−Brinkman model. The control volume finiteelement method was used to solve the set of coupled equations of mass, momentum, energy, and species conservation. Influence of the Soret effect on the irreversibility was studied by the variation of the thermal diffusion ratio, the Darcy number, the thermal porous Rayleigh number, and the buoyancy ratio. It was found that entropy generation is driven by heat transfer, diffusion or viscous irreversibility according to thermal diffusion ratio, the buoyancy ratio, and the Darcy number values.