par Colinet, Pierre ;Haut, Benoît ;Margerit, Jonathan;Peeters, Fabienne ;Legros, Jean Claude ;Halloin, Véronique
Référence CHISA-15(Prague, République Tchèque), Proceedings of the 15th International Congress of Chemical and Process Engineering
Publication Publié, 2002
Publication dans des actes
Résumé : A theoretical model of the evaporation process of a pure liquid layer is developed, focusing on the influence of an inert gaseous component, in addition to vapour, on surface-tension-driven Bénard instabilities. Assuming that the gas phase is perfectly mixed at some distance from the interface (given composition, pressure and temperature) and provided this distance is not much larger than the liquid depth, it is shown that a reduction of the full two-layer problem to a one-layer problem is possible, provided the evaporation rate is not too high. An expression is given for the corresponding dimensionless heat transfer coefficient (i.e. the Biot number) at the evaporating interface, and the approach is validated by comparison with a direct resolution of the full two-layer problem.