BOUNDARY LAYER FLOWWITH DIFFUSION AND FIRST-ORDER CHEMICAL REACTION OVER A POROUS FLAT PLATE SUBJECT TO SUCTION/INJECTION AND WITH VARIABLE WALL CONCENTRATION

In this paper, an investigation is made to study the boundary layer flow over a porous flat plate with diffusion of chemically reactive species undergoing first-order reaction and subject to suction or injection. In this analysis, the variable plate concentration is considered. Using similarity variable technique, the governing partial differential equations are transformed into a set of self-similar ordinary differential equations which are solved by shooting method. The study reveals that for the increase of suction at the plate both velocity and concentration boundary layer thicknesses decrease and for increasing injection both thicknesses increase. The con centration at a fixed point within the boundary layer decreases with increasing values of the Schmidt number, the reaction rate parameter and the power-law exponent. For a fixed point, with increase of reaction rate parameter the agnitudeof concentration gradient initially increases and then after a point it decreases. The rate of solute transfer fromthe plate increases with reaction rate parameter and power-law exponent.