We have considered Soret and Dufour effects on two dimensional free convection flow of an electrically conducting, incompressible, viscous fluid along a semi-vertical permeable moving plate. A uniform transverse magnetic field is applied in the presence of thermal and concentration buoyancy forces. The thermal and concentration boundary layer effects have been considered. By systematically transforming the governing partial differential equations into non-dimensional forms using selected similarity variables and then the non dimensional governing equations converted to coupled non-linear ordinary differential equations by small perturbation technique. The confined similarity equations are solved using a shooting method together with a Runge-Kutta algorithm. A representative set of graphical results for the velocity, temperature and concentration have been plotted within the boundary layer region for various existing flow parameters. The skin friction coefficient is seen to increase with increasing Soret number, Dufour number, thermal Grasohf number, concentration Grashof number but decreases with increasing the magnetic parameter, Prandtl number and Schmidt number. Nussult number decreases with increasing Prandtl and Soret number but decreases with increasing Dufour number. Sherwood number increases with increasing Schmidt and Dufour number but decreases with increasing Soret number. The fluid velocity in the boundary layer become significantly higher with increasing Soret number, Dufour number, thermal Grasohf number, concentration Grashof number but decreases with increasing magnetic parameter, Prandtl number, Schmidt number, suction and permeability parameter. The fluid temperature is become higher in the boundary layer region with increasing Dufour number and become lower with increasing Soret and Prandtl number, but reverse effect is observed in case of concentration.
Deva Kanta Phukan (Tue,) studied this question.