A study of the liquid evaporation with Darcian resistance effect on mixed convection in porous media

A problem of the evaporation of liquid with Darcian resistance effect on mixed convection flow over a vertical plate in an isotropic porous medium has been studied. Two flow models, aiding and opposing flows, are considered. The boundary layer equations are integrated numerically to obtain the non-similar solutions for the velocity, temperature and concentration distributions for several values of the Darcian resistance and buoyancy force parameters. The results show that the evaporation of liquid on the wall increases when the buoyancy force RaK / Pex is gradually increased and the overall heat transfer rate will be pronounced when the Darcian resistance ζ is very small.