Latin American applied research
Print version ISSN 0327-0793
AHMED, N.; SARMAH, H. K. and KALITA, D.. Thermal diffusion effect on a three-dimensional mhd free convection with mass transfer flow from a porous vertical plate. Lat. Am. appl. res. [online]. 2011, vol.41, n.2, pp. 165-176. ISSN 0327-0793.
A systematic analysis to study the effect of thermal diffusion on a three dimensional free convective flow with mass transfer of an incompressible viscous electrically conducting fluid past a porous vertical plate with transverse sinusoidal suction velocity is presented. Due to this type of suction velocity at the plate the flow becomes three-dimensional one. A magnetic field of uniform strength is assumed to be applied normal to the plate directed into the fluid region. The magnetic Reynolds number is considered to be small so that the induced magnetic field can be neglected. An analytical solution of the problem is obtained. The expressions for the velocity field, fluid temperature, species concentration, fluid pressure, skin-friction, Nusselt number and Sherwood number and current density are obtained in non-dimensional forms. The effects of Hartmann number, Soret number, Reynolds number and Prandtl number on the velocity field, temperature and concentration distributions, skin friction at the plate and on the amplitudes of the first order skin-friction, the first order Nusselt number and the first order Sherwood number at the plate are discussed graphically. It is seen that the thermal diffusion and applied magnetic field have significant effects on the flow and on the heat and mass transfer characteristics.
Keywords : Thermal Diffusion; Species Concentration; Free Convection; Skin-Friction; Electrically Conducting.