Apparent dewetting due to superfluid flow
Laboratoire de Physique Statistique de l'École
associé au CNRS et aux Universités Paris 6 et Paris 7
24 rue Lhomond, 75231 Paris Cedex 05, France
Accepted: 27 March 2002
We have investigated the wetting behaviour of superfluid helium-4 on silicon. Surprisingly, we observe pseudo-dewetting: though a thick superfluid film covers the substrate, the meniscus diplays a finite contact angle which decreases from about at low temperature down to zero at the superfluid transition. We show that this behaviour can be explained by a pressure decrease due to a superfluid flow, closely related to the Kontorovich effect.
PACS: 68.08.Bc – Wetting / 68.15.+e – Liquid thin films / 83.10.Bb – Kinematics of deformation and flow
© EDP Sciences, 2002