Unsteady MHD Heat and Mass Transfer Flowover Stretching Sheet in Porous Medium withVariable Properties Considering ViscousDissipation and Chemical Reaction

摘要

Unsteady magneto hydrodynamic heat and mass transfer flow of viscous, incompressible fluid flow over a stretching sheet embedded in a porous medium with variable viscosity and thermal conductivity have been analyzed, by taking into account viscous dissipation and chemical reaction. The governing coupled non-linear partial differential equations are reduced to similarity boundary layer equations using suitable transformation and then solved using the Runge-Kutta fourth order procedure along with shooting technique. The effects of various flow parameters on the velocity, temperature and concentration distributions are analyzed and presented graphically. Skin-friction coefficient, Nusselt number and Sherwood number are derived, discussed numerically and their numerical values for various values of physical parameter are presented through tables. It is noted that the skin-friction coefficient –f^'' (0) and temperature gradient –θ^' (0) increase with the increase of variable viscosity as well as velocity suction parameter but the Sherwood number-φ^' (0) decreases. The effect of Eckert number and Prandtl number increases the values of –f^'' (0) and mass transfer rate -φ^' (0) but decrease the temperature gradient–θ^' (0).