UNSTEADY MIXED CONVECTION FLOW OVER A VERTICAL PLATE IN A POROUS MEDIUM WITH NON-UNIFORM SLOT SUCTION/INJECTION

摘要

The aim of this paper is to present the unsteady mixed convection flow over a moving vertical plate in a parallel free stream embedded in a porous medium under the effect of thermal radiation in the presence of nonuniform slot suction (injection). The unsteadiness is caused by the time-dependent free stream velocity varying arbitrarily with time. Nonsimilar solutions are obtained by solving the coupled nonlinear partial differential equations using the quasi-linearization technique in combination with an implicit finite-difference scheme. The numerical values obtained within the boundary layer for the dimensionless velocity, temperature, concentration, the local skin friction coefficient, the local Nusselt, and Sherwood numbers are presented through graphs and a table for several sets of values of the parameters. Results indicate that the local skin friction coefficient, the local Nusselt number and the Sherwood number increase with nonuniform slot suction, but the effect of nonuniform slot injection is just opposite. A comparison with previous studies available in the literature has been done and we found an excellent agreement with them.