keywords: Cross-diffusion, Magnetohydrodynamics, Dufour, Soret numbers
Magnetohydrodynamics (MHD) boundary layer fluid flow in a porous medium over exponentially stretching sheet in the presence of heat generation and chemical reaction is the thrust of this paper. The study investigated the effects of Dufour (diffusion-thermo) and Soret (thermo-diffusion) on heat and mass transfer of MHD fluid flow in porous media over stretching surface. The PDEs were reduced to a coupled nonlinear Ordinary Differential Equations (ODEs) using similarity transformations. The ODEs representing the fluid flow, convective heat and mass transfer were simplified and solved by fourth order Runge-Kutta method with shooting technique. The result showed that: increase in Df and Sr. effects led to increase in skin friction but decrease was Sherwood and Nusselt respectively whereas decrease in Nusselt was noticed in the case of Dufour effect but increase was noticed in the case of Soret effect. Increase in radiation parameter led to corresponding increase in skin friction and Sherwood numbers but not in Nusselt number. The study concluded that solutal Grashof, thermal Grashof, magnetic parameter, radiation parameter, Dufour and Soret numbers had significant effects on MHD fluid flow in porous media stretching surface. This study is recommended for use in plastic extrusion as well as MHD power generation systems.
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