Volume 47, Number 3, August I 1999
|Page(s)||345 - 351|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Boiling crisis and non-equilibrium drying transition
Département de Recherche Fondamentale sur la Matière Condensée, CEA Grenoble 17, rue des Martyrs, 38054, Grenoble Cedex 9, France
Accepted: 31 May 1999
Boiling crisis is the rapid formation of the quasi-continuous vapor film between the heater and the liquid when the heat supply exceeds a critical value. We propose a mechanism for the boiling crisis that is based on the spreading of the dry spot under a vapor bubble. The spreading is initiated by the vapor recoil force, a force coming from the liquid evaporation into the bubble. Since the evaporation intensity increases sharply near the triple contact line, the influence of the vapor recoil can be described as a change of the apparent contact angle. Therefore, for the most usual case of complete wetting of the heating surface by the liquid, the boiling crisis can be understood as a drying transition from complete to partial wetting.
PACS: 68.45.Gd – Wetting / 68.45.Da – Adsorption and desorption kinetics; evaporation and condensation
© EDP Sciences, 1999
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