Heat and mass transfer in MHD flow of nanofluids through a porous media due to a stretching sheet with viscous dissipation and chemical reaction effects

This paper investigates the convective heat and mass transfer in nanofluid flow through a porous media due to a stretching sheet subjected to magnetic field, viscous dissipation, chemical reaction and Soret effects. Two types of nanofluids, namely Cu-water and Ag-water were studied. The governing boundary layer equations are formulated and reduced to a set of ordinary differential equations using similarity transformations and then solved numerically by an explicit finite difference scheme known as the Keller box method. Numerical results were obtained for the skin friction coefficient, Nusselt number, Sherwood number as well as for the velocity, temperature and concentration profiles for selected values of the governing parameters, such as the nanoparticle volume fraction , the magnetic parameter M, porous media parameter , Eckert number Ec, Soret number Sr, Schmidt number Sc and chemical reaction parameter. Excellent validation of the present numerical results has been achieved with the earlier linearly stretching sheet problems in the literature. 2 Introduction The study of the boundary layer flow of an electrically conducting fluid through a porous media has many applications in manufacturing and natural process which include cooling of electronic devices by fans, cooling of nuclear reactors during emergency shutdown, cooling of an infinite metallic plate in a cooling bath, textile and paper industries, glass-fiber production, manufacture of plastic and rubber sheets, the utilization of geothermal energy, the boundary layer control in the field of aerodynamics, food processing, plasma studies and in the flow of biological fluids.