Europhys. Lett, 47 (3), pp. 345-351 (1999)
Boiling crisis and non-equilibrium drying transition
V. S. Nikolayev and D. A. Beysens
Département de Recherche Fondamentale sur la
Matière Condensée, CEA Grenoble
17, rue des Martyrs, 38054, Grenoble Cedex 9, France
(received 22 December 1998; accepted in final form 31 May 1999)
PACS. 68.45Gd - Wetting.
PACS. 68.45Da - Adsorption and desorption kinetics; evaporation and condensation.
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.
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