HEAT AND MASS-TRANSFER IN EVAPORATING 2-COMPONENT LIQUID-FILM FLOW

Turbulent multicomponent gas flow with evaporation from a two-component liquid film is considered. To model the transport processes in detail special attention is drawn to the phase equilibrium of binary liquids and multicomponent thermodynamics. The numerical method applied solves the coupled governing equations together with the boundary and interfacial conditions. The solution technique is based upon a variational procedure for the determination of the temperature at the gas-liquid interface. The prediction for the evaporation of benzene-methanol mixtures into a hot tubular air stream clearly shows the influence of the phase equilibrium and its interaction with the local transport processes. Even small portions of a second component can lead to significant changes in the heat and mass transfer. This verifies the importance of detailed physical models and efficient solution procedures. © 1990.