par Debaste, Frédéric ;Colinet, Pierre
Référence World Congress of Chemical Engineering (8th: 23-27 août 2009: Montréal, Canada)
Publication Non publié, 2009-08-25
Communication à un colloque
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 vapour 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 compared to with film thickness profiles obtained experimentaly using a Mach-Zehnder Interferometer. Strong discrepancies are observed, however it is shown that these can all be attributed to the evaluation of a precise disjoining pressure expression.