Heat and mass transfer effects on unsteady MHD flow of a chemically reacting fluid past an impulsively started vertical plate with radiation

The objectives of the present study are to investigate thermal radiation of a viscous incompressible unsteady chemically reacting and hydromagnetic fluid flow past an impulsively started vertical plate with heat and mass transfer is analyzed. The fluid is a gray, absorbing-emitting but nonscattering medium and the Rosseland approximation is used to describe the radiative heat flux in the energy equation. The governing equations are solved using an implicit finite-difference scheme of Crank-Nicolson type. Numerical results for the transient velocity, the temperature, the concentration, the local as well as average skin-friction, the rate of heat and mass transfer are shown graphically. It is found that as small values of the Prandtl number and radiation parameter N, the velocity and temperature of the fluid increase sharply neat the cylinder as the time t increase, which is totally absent in the absence of radiation effects. It is observed that the presence of chemical reaction parameter K(>0) leads to decrease in the velocity field and concentration and rise in the thermal boundary thickness.