Unsteady MHD free convective chemically reacting fluid flow over a vertical plate with thermal radiation, Dufour, Soret and constant suction effects

Abstract

Unsteady MHD free convective flow of a chemically reacting incompressible fluid over a vertical porous plate under the combined effects of thermal radiation, Dufour, Soret and constant suction is examined. The governing non-linear equations are solved semi analytically using the methods of similarity transformation and perturbation series expansions. Expressions for the velocity, temperature, concentration and Nusselt number for the flow are obtained and presented graphically. The analysis shows that Dufour number increases the temperature and velocity; Soret number increases the concentration and velocity; suction parameter decreases the temperature, concentration and velocity, but increases the Nusselt number; chemical reaction rate decreases the temperature but increases the concentration, velocity and Nusselt number; magnetic field force increases the velocity; Grashof numbers increase the velocity when their values are increasingly varied.