NUMERICAL STUDY OF LIQUID-FILM COOLING IN A TURBULENT GAS-STREAM

A numerical method for analyzing liquid film cooling along an inclined plate in a turbulent stream of air is presented. Heat and mass transfer characteristics in an air-water system are mainly considered. A marching procedure is employed for solutions of the equations of mass, momentum, energy and concentration in the system. The effects of the inclined angle phi, free-stream temperature T(infinity), free-stream velocity u(infinity) and inlet film thickness delta on the heat and mass transfer along the gas-liquid interface are examined in detail. Results show that an increase in free-stream temperature or velocity may cause a reduction in interfacial temperature, while an increase in inclined angle or inlet film thickness results in an increase in interfacial temperature. Additionally, a reduction in inclined angle phi causes an increase in interfacial temperature, which in turn leads to a larger latent heat flux and mass evaporation rate.