Abstract

In this paper, the combined study of Soret and Dufour effect on a natural convective boundary layer flow of an isothermal sphere embedded in porous medium is investigated under different boundary conditions. We have considered two common processes specifying the wall-to-ambient temperature and concentration distributions, namely: (a) constant wall temperature and concentration; (b) constant surface heat and mass flux; (c) convective heat and mass transfer boundary conditions. The appropriate similarity transformation is applied for converting governing partial differential equations to ordinary differential equations and obtained numerical solution by using bvp4c technique in MATLAB software. By this study, we are able to understand the effect of pertinent parameters i.e. permeability parameter K, buoyancy ratio parameter Nb, Soret Sr and Dufour Du number on velocity, temperature and concentration profiles. These effects have been shown by graphs and skin friction, Nusselt number and Sherwood number are also obtained.