RESUMEN

In this paper unsteady laminar free convection flow of a viscous incompressible fluid past and accelerated infinite vertical porous plate subjected to a constant suction (or injection) is considered. Numerical results for the skin friction on the plate are obtained for the class of accelerated motions whose velocity is of the form U_Otⁿ where t is time, U_O a constant and n is a positive integer. The skin friction tends to 0 with increasing t when the Grashorf number Gr= λ², the Prandtl number σ =1, n=0, and λ>0 which corresponds to suctions.