Mass transfer and free convection effects on the flow past an accelerated vertical infinite plate with variable suction or injection

The effects of convective heat and mass transfers on the flow distribution of an incompressible viscous dissipative fluid subjected to variable suction and injection past an infinite vertical porous plate accelerated in its own plane are investigated. Analytic expressions for the velocity, temperature and mass concentrations are obtained on the basis of equations for mass, momentum and energy conservation and mass transfer within a concentration boundary layer. These expressions are also used to calculate the dimensionless skin friction and heat transfer rate. Plots of the velocity profiles indicate that the dimensionless velocity increases with increases in a modified Grashof number and with flow injection, and decreases with the application of suction. For plate heating, a reverse flow to that observed in suction or injection is found, which, however, becomes weaker with increasing Grashof number and suction. Fluid temperature is observed to increase with temperature in both plate heating and cooling, and to be greater inside the thermal boundary layer in injection than in suction. Suction is also shown to decrease frictional drag in the case of plate cooling, while heat transfer rates are greater in the case of no mass transfer, and decrease with increasing modified Grashof number and suction.