Abstract
Water evaporation from an homogeneous porous media, which is submitted to radiative and convective fluxes on its interface with air, is analysed by the energy balance equations and the classical transfer equations. Two Ievels are considered: the surface of the body, or its interface with air, and the deep front of evaporation. In this first analysis, the part located between these two levels is considered only as the site of a heat conductive flux and a water vapour flux, all liquid water flux is supposed negligible compared with water vapour flux. Then, it is possible to express the density of latent heat flux and the equilibrium values which characterize the level of the evaporation front and the surface of the body, such as temperature and water vapour pressure. These expressions are functions of the characteristics of air flow, radiative balance and coefficients, mainly two unidimensional numbers one of which has been used in the study of heat-transfer phenomena by Luikov [1]; these coefficients are the Brun numbers referred to heat and mass transfer.
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