Pseudo-contact angle due to superfluid vortices in $^{4}$He
R. Luusalo, A. Husmann, J. Kopu, and P.J. Hakonen
TL;DR
This study explores how superfluid vortices influence the pseudo-contact angle of helium-4 on different substrates, revealing a correlation between vortex distribution and contact angle variation.
Contribution
It introduces a theoretical model linking vortex line distribution and unpinning velocity to observed contact angles in superfluid helium-4.
Findings
Contact angles vary from 0 to 15 mrad on different substrates.
Theoretical calculations explain contact angle variation via vortex line distribution.
Unpinning velocity is inversely proportional to liquid depth.
Abstract
We have investigated spreading of superfluid He on top of polished MgF and evaporated SiO 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.
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