Effect of Double Dispersion on Mixed Convection Heat and Mass Transfer in Non-Darcy Porous Medium

Abstract

Similarity solution for the problem of hydrodynamic dispersion in mixed convection heat and mass transfer from vertical surface embedded in porous media has been presented. The ¯ow induced by the density variations is comparable with the freestream ¯ow. The heat and mass transfer in the boundary layer region for aiding and opposing buoyancies in both aiding and opposing ¯ows has been analyzed. The structure of the ¯ow, temperature, and concentration ®elds in the Darcy and non-Darcy porous media are governed by complex interactions among the diffusion rate (Le) and buoyancy ratio (N) in addition to the ¯ow driving parameter (Ra/Pe). The ¯ow, temperature, and concentration ®elds are analyzed and the variation of heat and mass transfer coef®cients with the governing parameters are presented