Université Paris-Saclay (Espace Technologique, Bat. Discovery - RD 128 - 2e ét., 91190 Saint-Aubin - France)
Abstract : We study the dynamics of evaporating ethanol films deposited by a receding liquid
meniscus. The films are surrounded by pure vapor in a capillary heated above the saturation
temperature. We observe the substrate dewetting with the dewetting ridge in spite of the
complete wetting at equilibrium. The dewetting is caused by a high contact angle (∼30◦)
induced by evaporation. The obtained values agree with a theory proposed earlier. The film
shape is measured with both grid deflection technique and interferometry. The phenomenon
is convenient to observe inside a capillary with an axial thermal gradient. When the capillary
is closed at one end and open at another to a constant pressure reservoir, the meniscus
oscillations are known to appear spontaneously. Such a system is the simplest version of
an industrial device called a pulsating heat pipe. The effect is general and can be used in
any system to control the wetting properties
https://hal-cea.archives-ouvertes.fr/cea-01485388
Contributeur : Dominique Girard
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Soumis le : mercredi 8 mars 2017 - 16:28:34
Dernière modification le : jeudi 15 mars 2018 - 15:06:54
Document(s) archivé(s) le : vendredi 9 juin 2017 - 13:48:34
L. Fourgeaud, E. Ercolani, J. Duplat, P. Gully, Vadim S. Nikolayev. Evaporation-driven dewetting of a liquid film. Physical Review Fluids, American Physical Society, 2016, 1, pp.41901(R). 〈10.1103/PhysRevFluids.1.041901〉. 〈cea-01485388〉
