EFFECT OF CHEMICAL REACTION ON MHD FLOW WITH HEAT AND MASS TRANSFER PAST A POROUS PLATE IN THE PRESENCE OF VISCOUS DISSIPATION

摘要

An attempt is made to study an unsteady MHD free convective flow with heat and mass transfer past a semi-infinite vertical porous plate immersed in a porous medium. The presence of viscous dissipation and chemical reaction are taken into account. It is assumed that the plate is moved with uniform velocity in the direction of fluid flow. Viscous dissipation term lends nonlinearity in the governing equations. Applying perturbation technique, the solutions for velocity, temperature and concentration are obtained. The effect of various parameters such as Reynold number(Rc), Thermal Grashof number(Gr), Mass Grashof number (Gc), Schmidt number (Sc) etc. on velocity, temperature and concentration are shown through graphs. Applications of the present study are shown in material processing systems and different chemical industries. In the physical realm, many irreversible processes are present. Some examples are heat flow through a thermal resistance, fluid flow through a flow resistance, chemical reactions etc. The irreversible process by means of which the work done by a fluid on adjacent layers due to the action of shear forces is transformed into heat is defined as viscous dissipation. It can be seen in many places such as in hydraulic engineering, waves or oscillations etc. viscous dissipation has different applications in various industries.