Abstract
The effect of nonhomogeneity of the medium is investigated in the case of natural convection in a vertical porous layer. The flows are driven by conditions of uniform heat and mass fluxes imposed along the two vertical side walls of the porous layer. It is found that the effect of nonhomogeneity is significant for sharper permeability variations and large Rayleigh numbers, Lewis numbers and absolute buoyancy ratios. Nusselt and Sherwood number estimates in such cases are found to be quite different from that of the homogeneous medium.
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