Second law analysis in double diffusive convection through an inclined porous cavity

• We investigate entropy generation for thermosolutal convection.
• We examine effects of geometric parameter of the cavity on entropy generation in both transient and steady state.
• Entropy generation have extrema for specific values of inclination angle.
• Irreversibilities considerably depend on aspect ratio and inclination angle.

A numerical investigation of entropy generation in steady–unsteady double diffusive convection through an inclined porous enclosure is carried on. Expressions of different irreversibilities are firstly derived. Then, effects of the enclosure inclination angle, α, and the enclosure aspect ratio, A, on entropy generation, heat and mass transfer, and fluid flow are analysed. It was found that entropy generation exhibits an oscillatory behaviour for lower (Da = 10−4) and higher (Da = 10−2) medium permeability values, when α ≠ 0°. Minimum entropy generation is found at the aspect ratio A = 0.5 and 1, for Da = 10−2 and 10−4, respectively. More details about the influence of the above mentioned operating parameters on entropy generation, heat and mass transfer and fluid flow are discussed and graphically presented.