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Three-dimensional thermosolutal natural convection and entropy generation within an inclined enclosure is investigated in the current study. A numerical method based on the finite volume method and a full multigrid technique is implemented to solve the governing equations. Effects of various parameters, namely, the aspect ratio ( z A ), buoyancy ratio (N) and inclination angle ( ) on the flow patterns, heat and mass transfer rates as well as entropy generation are predicted and discussed. A comparison of 2D and 3D models at normal situation 0   is conducted when N varied in the transition range -2≤N≤-0.6 demonstrating that the 2D assumption can be adopted for the 3D flows when -0.5≤N≤0. The numerical outcome of the present study shows that, the thermal and solutal isosurfaces exhibit a central stratification that significantly strengthens as z A is augmented. It is also found that decreasing the aspect ratio value z A leads to weakening the total entropy generation and reducing the 3D effects exhibited within the cavity. Especial attention is attributed to analyze the periodic flow pattern that appears for 4 10 Ra  , 2  z A and 75   . In terms of irreversibility criterion at the oscillatory regime, total entropy generation ( tot S ) and Bejan number (Be) are seen to oscillate with the same frequency but in opposing phases and with different amplitudes.

Analysis of thermosolutal natural convection and entropy generation within a three-dimensional inclined cavity with various aspect ratios