This study concerns the liquid transpiration cooling effect on thermal protection of a porous plate wall. The results indicate that the effectiveness reaches more than 95% for a very weak effusion rate, about 0.1%, that is to say 50 times weaker than that of gas effusion. The concentration profile in the boundary layer is calculated experimentally and the rate of liquid evaporated is then calculated numerically, using a model based an utilization of momentum equations in laminar flow for the boundary layer. The results of this numerical study confirm evaporation rates calculated by semi-empirical relations.