Double dispersion effects on natural convection heat and mass transfer in non-Darcy porous medium

The problem of hydrodynamic dispersion in non-Darcy free convection heat and mass transfer from vertical surface embedded in a porous medium has been presented. The Forchheimer extension is considered in the flow equations. The flow, temperature and concentration fields in Darcy and non-Darcy porous media are observed to be governed by complex interactions among the diffusion rate Le, buoyancy ratio N , and the parameters c, f, F0, Rad. Numerical results for the details of the velocity, temperature and concentration profiles which are shown on graphs have been presented. The combined effect of thermal dispersion and solutal diffusivity, for the two cases Darcy and non-Darcy porous medium, on the heat transfer rate which are entered in tables is discussed. 2003 Elsevier Inc. All rights reserved.