Pseudo-contact angle due to superfluid vortices in
Low Temperature Laboratory, Helsinki University of Technology, Espoo
P.O. Box 2200, FIN-02015 HUT, Finland
Accepted: 27 January 2000
We have investigated spreading of superfluid on top of polished and evaporated substrates. Our results show strongly varying contact angles of 0–15 mrad on the evaporated layers. According to our theoretical calculations, these contact angles can be explained by a spatially varying distribution of vortex lines, the unpinning velocity of which is inversely proportional to the liquid depth.
PACS: 68.45.Gd – Wetting / 67.70.+n – Films (including physical adsorption) / 67.40.Vs – Vortices and turbulence
© EDP Sciences, 2000