TY - JOUR
TI - Numerical study of heat and mass transfer during evaporation of a thin liquid film
AU - Oubella M'hand
AU - Feddaoui M'barek
AU - Mir Rachid
JN - Thermal Science
PY - 2015
VL - 19
IS - 5
SP - 1805
EP - 1819
PT - Article
AB - 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.