Interfacial Evaporation of Falling Liquid Films with Wall Heating

摘要

The interfacial evaporation of falling water films with wall heating was experimentally studied andanalyzed. The results presented in this paper showed that the capillary-induced interfacial evaporation playedan important role in heat transfer of a falling liquid film. It would be independent of the wall heat flux andsomewhat lower than that without wall heating for impure fluids such as water-air system. The thermodynamicanalysis conducted gave a theoretical basis for the experimental observations. The effective capillary radiuswas correlated with the mass flow rate. The experimental results and analysis showed that the interfacialevaporation should be taken into account in the study of falling liquid film heat transfer.``