Double-Diffusive Convection for a Non-Newtonian Fluid Flow Past a Permeable Surface Embedded in a Porous Medium with Uniform Heat and Mass Fluxes

摘要

The problem of steady, laminar, double-diffusive mixed convective flow of a non-Newtonian power-law fluid past a vertical semi-infinite permeable surface embedded in a porous medium with uniform heat and mass fluxes. A mixed convection parameter for the entire range of free-forced-mixed convection is employed and a set of nonsimilar equations are obtained. These equations are solved numerically by an efficient implicit, iterative, finitedifference method. The obtained results are checked against previously published work for special cases of the problem and are found to be in good agreement. A parametric study illustrating the influence of the concentration to thermal buoyancy ratio, power-law fluid viscosity index, mixed convection parameter, suction or injection parameter and the Lewis number on the local Nusselt and the Sherwood numbers is conducted. The obtained results are shown graphically and the physical aspects of the problem are discussed.