Diffusion-Thermo and Thermal-Diffusion Effects on Free Convective Heat and Mass Transfer Flow in A Porous Medium with Time Dependent Temperature and Concentration

The diffusion-thermo and thermal-diffusion effects on unsteady free convection and mass transfer flow along an accelerated vertical porous plate embedded in a porous medium have been studied numerically taking the plate temperature and concentration to be functions of time. The governing nonlinear partial differential equations are transformed into a set of coupled ordinary differential equations, which are solved numerically by applying Nachtsheim-Swigert shooting iteration technique along with sixth order Runge-Kutta integration scheme. The effects of various parameters entering into the problem have been examined on the flow field for a hydrogen-air mixture as a non-chemical reacting fluid pair. The numerical results have shown that the above-mentioned effects have to be taken into consideration in the fluid, heat and mass transfer processes.