NUMERICAL-ANALYSIS OF FLUID-FLOW AND MASS-TRANSFER IN A CHANNEL WITH A POROUS BOTTOM WALL

The flow of a solution between parallel plates is considered. The bott om plate is porous, while the top one is an impermeable solid. A compu ter program based on the control volume approach was developed to anal yse the flow and concentration fields. The effects of the slip at the porous wall on the velocity and particle concentration distributions w ere investigated. It was observed that as the slip increases, the conc entration on the porous wall decreases and the maximum velocity moves towards the porous wall. The concentration on the porous wall increase s in the flow direction. This increase in the particle concentration a long the porous wall may cause a reduction of the porosity and hence a variation in the suction rate along the porous wall. In order to take this effect into account, a linearly varying transverse velocity alon g the porous wall was considered. The results were compared with the d ata available in the literature.