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A numerical study of mixed convection heat and mass transfer with film   evaporation in a vertical channel is developed. The emphasis is focused on   the effects of vaporization of three different liquid films having widely   different properties, along the isothermal and wetted walls on the heat and   mass transfer rates in the channel. The induced laminar downward flow is a   mixture of blowing dry air and vapour of water, methanol or acetone, assumed   as ideal gases. A two-dimensional steady state and elliptical flow model,   connected with variable thermo-physical properties, is used and the phase   change problem is based on thin liquid film assumptions. The governing   equations of the model are solved by a finite volume method and the   velocity-pressure fields are linked by SIMPLE algorithm. The numerical   results, including the velocity, temperature and concentration profiles, as   well as axial variations of Nusselt numbers, Sherwood number and   dimensionless film evaporation rate are presented for two values of inlet   temperature and Reynolds number. It was found that lower the inlet   temperature and Re, the higher the induced flows cooling with respect of most   volatile film. The better mass transfer rates related with film evaporation   are found for a system with low mass diffusion coefficient

Numerical study of heat and mass transfer during evaporation of a thin liquid film