INFLUENCE OF CHEMICAL REACTION ON TRANSIENT MHD FREE CONVECTIVE FLOW OVER A VERTICAL PLATE IN SLIP-FLOW REGIME

In the present study, an analysis is carried out to study the Magnetohydrodynamic and chemicalreaction effects on unsteady flow, heat and mass transfer characteristics in a viscous,incompressible and electrically conduction fluid over a semi-infinite vertical porous plate in aslip-flow regime. The porous plate is subjected to a transverse variable suction velocity. Thetransient, non-linear and coupled governing equations have been solved adopting a perturbativeseries expansion about a small parameter, ε. The effects of governing parameters on the flowvariables are discussed quantitatively with the aid of graphs for the flow field, concentration fieldand fluctuating parts of both the skin-friction and the rate of mass transfer. All numericalcalculations are done with respect to air at 20oC (Pr = 0.71) as well as water (Pr = 7) in presenceof diffusing chemical species has Schmidt number Sc = 0.22. Comparison between the results ofthe present analytical model with previously published works provides excellent agreement. It isfound that, the chemical reaction parameter has a retarding effect on the velocity of flow field aswell as concentration distributions, while rarefaction parameter leads to increase both the transientvelocity and amplitude of skin-friction. However, the magnetic effect is found to decrease theflow field and both the amplitude as well as phase of skin-friction. During the course ofdiscussion, it is found that chemical reaction, rarefaction parameter as well as magnetic fieldappreciably influence the fluid flow.