EVAPORATION OF FALLING LIQUID FILM ON A VERTICAL CHANNEL COVERED WITH A THIN POROUS LAYER

This article investigates the numerical analysis of heat and mass transfer during the evaporation of water liquid film. The film falls down on one plate of a vertical channel under mixed convection. The first plate of a vertical channel is covered with a thin porous layer of thickness δ and externally subjected to a uniform heated flux qi while the second one (y = d) is dry and isothermal. The liquid consists of pure water film while the gas mixture has two components: dry air and water vapor. The results address the effects of porosity £ and porous layer thickness 5 of the porous media on the heat and mass transfer performance and on the water evaporation rate. It is shown that the presence of the porous layer enhances the heat and mass transfer performance at the liquid−gas interface during the water liquid film evaporation.