par Debaste, Frédéric ;Dubois, Frank ;Colinet, Pierre
Référence EUROTHERM(84: 25-27 mai 2009: Namur), Proceedings of the EUROTHERM n°84 Seminar on “Thermodynamics of Phase Changes”
Publication Publié, 2009
Publication dans des actes
Résumé : A model of evaporation from the extended meniscus, including the thin liquid film, in a capillary tube in presence of inert gas is developed. The simplified case of an isothermal slowly evaporating liquid is considered. The vapor is assumed to be diluted. Gas phase diffusive mass transfer is coupled with the liquid film lubrification equation. The model is used to evaluate the impact of the expression of disjoining pressure on the global evaporation rate and on the film profile. The results highlight strong differences for polar and non-polar fluids. Under the considered assumptions, the film may have a strong influence on the global evaporation rate only when the disjoining pressure expression combines polar and non-polar terms. The model results are also compared to with film thickness profiles obtained experimentaly using a Mach-Zehnder Interferometer.