Lateral mass flux and thermal radiation on natural convection heat and mass transfer from a vertical flat plate in porous media considering Soret/Dufour effects

Abstract

The heat and mass transfer characteristics of natural convection about a vertical flat plate embedded in a saturated porous medium with blowing/suction and thermal radiation effects considering Soret and Dufour are numerically analyzed. The surface of the vertical flat plate has a uniform wall temperature and uniform wall concentration (UWT/UWC). The surface blowing/suction velocity is variable. The Rosseland diffusion approximation is employed to describe the radiative heat flux. Similar governing equations are solved by Keller box method. Comparisons showed excellent agreement with the numerical data in previous works. Numerical data for the dimensionless temperature profile, the dimensionless concentration profile, the local Nusselt number and the local Sherwood number are presented graphically for the buoyancy ratio N, the Lewis number Le, the Soret parameter S, the Dufour parameter D, the lateral mass flux parameter fw and the thermal radiation parameter Rd. Results show that increase the lateral mass flux parameter and thermal radiation parameter tends to increase the local Nusselt number and the local Sherwood number.