Abstract
Numerical results of two dimensional double diffusive natural convection in a square porous cavity submitted to cross gradients of heat and solute concentration are reported in this study. The parameters governing the problem are the thermal Rayleigh number (100⩽ Ra⩽200), the Lewis number (0.1⩽ Le⩽10) and the buoyancy ratio (−10⩽ N⩽10). The effects of the governing parameters on the flow structure and heat and mass transfer are analyzed. It is demonstrated that the solutal buoyancy force induced by horizontal concentration gradients eliminates the multiplicity of solutions obtained in pure thermal convection when N exceeds some critical value, which depends on Le and Ra. For N>0/( N<0), the monocellular trigonometric/(clockwise) solution is maintained for all the explored ranges of the governing parameters considered in this study.
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