Numerical solution of double-diffusive natural convection in a porous cavity partially heated from belowand partially salted from the side

Double-diffusive natural convection in a square porous enclosure is studied numerically when the bottom and right walls are partially heated and partially salted, respectively. The top wall is maintained at a constant cold temperature and the left wall is fully salted at a lower concentration than the right. The Darcy model is used in the mathematical formulation. The finite volume method is used to solve the governing equations. The governing parameters of the present study are Rayleigh number (Ra), Lewis number (Le), buoyancy ratio (N), heating segment length (lh), heating segment position (xh), concentration segment length (ls), and concentration segment position (ys). The results were discussed in the effect of these parameters on streamlines, isotherms, isoconcentration lines, and the heat- and mass-transfer processes, and presented graphically. Generally, there is a direct relation between buoyancy ratio and heat- and masstransfer processes. The results show a significant effect of the heating and concentration segment's length and position on the heat- and mass-transfer processes. The minimum value of average Nusselt number occurs with N = 0 for all the positions of the heating segment except the positions xh = 0.1 and 0.9, where the minimum value occurs with N = 1 and ..1, respectively.