par Colinet, Pierre 
;Rossomme, Séverine ;Rednikov, Alexei
Référence ILASS 2008(22: 8-10 September 2008: Como lake), Proceedings of the 22nd European Conference on Liquid Atomization and Spray Systems, page (018)
Publication Publié, 2008
;Rossomme, Séverine ;Rednikov, Alexei Référence ILASS 2008(22: 8-10 September 2008: Como lake), Proceedings of the 22nd European Conference on Liquid Atomization and Spray Systems, page (018)
Publication Publié, 2008
Publication dans des actes
| Résumé : | Evaporation/condensation processes of thin films of pure liquids lying on heated or cooled horizontal homogeneous and flat substrates are studied thanks to a lubrication-type equation describing the evolution of their deformable free surface. The one-sided model is restricted to a pure vapour phase at constant pressure, and includes the interfacial kinetic resistance to evaporation, the capillary and disjoining pressures, together with the thermodynamic influence of these last two effects on the saturation conditions. Besides flat liquid films, which are characterized for different forms of the disjoining pressure isotherm, the model also admits drop-like solutions, whose evaporation/condensation dynamics is explored in some details. Note that the analysis is limited to cases where an adsorbed (or precursor) film surrounds the droplets, whatever the regime considered. For a heated plate and attractive molecular interactions with the substrate (favouring complete wetting), the droplets appear as connections between a macroscopic quasi-spherical region and the adsorbed film, and evaporate with slowly receding apparent contact line. For a cooled substrate and molecular interactions promoting partial wetting, provided the initial film profile exceeds some nucleation threshold, similar drop-like solutions are observed after some time, though now growing with slowly advancing contact line. Coalescence of droplets and transition to film condensation is also observed after a certain time. |
