STUDY OF THE EVAPORATION IN MIXED CONVECT ION OF A LIQUID-FILM OF A BINARY MIXTURE FLOWING ON AN INCLINED PLANE SUBJECTED TO A CONSTANT HEAT-FLUX

In this article we propose a numerical analysis of the heat and mass t ransfer in a binary thin film flowing on an inclined plane. This analy sis rests on the resolution of transfer equations in liquid and vapour phases by using an implicit finite difference method. These equations are coupled and the mass diffusion in the liquid film is taken into a ccount. The most interesting results are obtained in forced convection , particularly in the case of ethylene glycol-water mixture. In fact, results obtained show that it is possible to increase the accumulated evaporation rate when the molar fraction of ethylene glycol is less th an 40%. In addition, even if the heat transfer coefficient decreases g enerally when the ethylene glycol composition in the mixture increases , it was found that is is possible to stabilise perhaps to increase th e heat transfer coefficient. This remark has already been observed by other authors. (C) 1998 Elsevier Science Ltd. All rights reserved.