Abstract
This paper focuses on the hydrodynamics of third sound on a superfluid 3 He film. We solve the hydrodynamical equations in the limit of thick films with weak interaction with the substrate. The surface tension at the free interface is shown to have a large effect on the third sound velocity and on the attenuation for frequencies larger than 1Hz. In the case of a diffusely scattering substrate a ripplon-like dispersion relation is found for this frequency range.
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Eggenkamp, M., Shvarts, V.A., Blaauwgeers, R. et al. On the Possibility of Observing Third Sound on 3He. Journal of Low Temperature Physics 110, 299–304 (1998). https://doi.org/10.1023/A:1022580615819
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DOI: https://doi.org/10.1023/A:1022580615819