Numerical investigation on heat transfer of flowing liquid film with inserted porous medium subjected to air jet impingement

In the paper, the physical and mathematical model of flowing liquid film with in-serted porous medium subjected to air jet impingement are constructed. The wall temperature, heat transfer coefficient distribution, and mass flux at the evapora-tion interface during the heat and mass transfer process of porous medium liquid film are obtained to analyze the effects of working fluid-flow Reynolds number, air jet Reynolds number and porous media physical parameters on the heat and mass transfer process of liquid film. The results show that porous medium rebuilds the thermal boundary-layer and increases the heat transfer. Raising the liquid flowing Reynolds number can reduce the wall temperature and decrease the mass flux at the evaporation interface, while increasing the air jet Reynolds number enhances the gas mixing and diffusion at the evaporation interface. In addition, an improved heat transfer can be expected with lower porosity of the porous me-dium due to the higher effective thermal conductivity, intense micro-convection and higher liquid film velocity.