Effects of Chemical Reaction on MHD Flow Past an Impulsively Started Semi-Infinite Vertical Plate with Uniform Heat and Mass Flux

Finite difference solution of the unsteady MHD flow past an impulsively started semi-infinite vertical plate with uniform heat and mass flux are presented here, taking into account the homogeneous chemical reaction of first order. The dimensionless governing equations are solved by an efficient, more accurate, unconditionally stable and fast converging implicit scheme. The effect of velocity, temperature and concentration for different parameters like chemical reaction parameter, Schmidt number, Prandtl number, thermal Grashof number, mass Grashof number and time are studied. The concentration profiles are compared with available exact solution in the literature and are found to be in good agreement. It is observed that due to the presence of first order chemical reaction, the velocity increases during the generative reaction and decreases in destructive reaction. It is observed that the velocity decreases in the presence of magnetic field, as compared to its absence.