Numerical Prediction of Turbulent Heat and Mass Transfer above a Porous Wall Subjected to Vaporisation Cooling
J. L. Lopez-Matencio, J. Bellettre and A. Lallemand
A numerical model is performed to simulate the evaporative cooling of porous walls subjected to hot turbulent airflow. In this approach, the vaporisation of liquid ethanol over the porous plate is considered in order to study the transfer into the turbulent boundary layer. Both dynamic and thermal aspects (including phase change) have been considered. Our results have shown good agreement with the experimental data available. We also notice the shear wall stress decrease by blowing in the boundary layer. This leads us to validate our approach and to calculate the vaporisation rate needed in liquid transpiration process for different hot main flow temperatures.