Fluctuating mass transfer on unsteady three-dimensional flow through a porous medium with variable permeability

An analysis of three-dimensional unsteady free convection flow, in presence of fluctuating mass transfer past an infinite vertical porous plate and heat transfer is carried out when the permeability of porous medium oscillates in time about a constant mean. Assuming constant suction at the plate, the problem becomes three-dimensional due to periodic variation of permeability in the transverse direction. The governing equations are solved by adopting complex notation and the expressions for the velocity, concentration and temperature fields are obtained. The wall shear-stress, rate of mass transfer and rate of heat transfer have been examined in details.