J. Phys. II France
Volume 3, Numéro 1, January 1993
Page(s) 21 - 26
DOI: 10.1051/jp2:1993108
J. Phys. II France 3 (1993) 21-26

Triple line dynamics in superfluid helium

Françoise Brochard-Wyart

Institut Curie, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France

(Received 14 September 1992, accepted in final form 28 October 1992)

Superfluid $^4\rm He$ fails to wet any substrate, as has been shown theoretically and experimentally. We study some hydrodynamic features expected in partial wetting (in conditions where exchanges with the vapor are negligible): i) the dynamics of dewetting: thin films deposited on non wettable surfaces are metastable below a critical thickness and evolve by nucleation and growth of dry holes. The holes are predicted here to open at constant velocity. ii) The collective modes of a contact line, "triplons", which are propagative.


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