heat and mass transfer by unsteady natural convection over a moving vertical plate embedded in a saturated porous medium with chemical reaction, soret and dufour effects

The thermal-diffusion and diffusion-thermo effects on heat and mass transfer by transient free convection flow of over an impulsively started isothermal vertical plate embedded in a saturated porous medium were numerically investigated, considering a homogeneous chemical reaction of first order. the transient, nonlinear and coupled governing equations are solved using an implicit finite-difference scheme. the effects of various parameters on the transient velocity, temperature, and concentration profiles as well as heat and mass transfer rates are analyzed. numerical results for the unsteady-state velocity, temperature and concentration profiles as well as the axial distributions and the time histories of the skin-friction coefficient, nusselt number and the sherwood number are presented graphically and discussed.