Theory of sound propagation in superfluid-filled porous media

The theory of sound propagation in macroscopically isotropic and homogeneous porous media saturated with superfluid 4He has been developed neglecting all damping processes. The case when the normal fluid component is locked inside a porous medium by viscous forces is investigated in detail. It is sh...

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Bibliographic Details
Published in:Physics letters. A 2002-08, Vol.300 (6), p.672-686, Article 672
Main Authors: Buishvili, T., Kekutia, Sh, Tkeshelashvili, O., Tkeshelashvili, L.
Format: Article
Language:English
Subjects:
Hydrodynamical waves
Porous materials
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Summary:The theory of sound propagation in macroscopically isotropic and homogeneous porous media saturated with superfluid 4He has been developed neglecting all damping processes. The case when the normal fluid component is locked inside a porous medium by viscous forces is investigated in detail. It is shown that in this case one shear wave and two longitudinal, fast and slow, waves exist. Fast wave as well as slow wave is accompanied with temperature oscillations. The velocities of these waves are obtained.
ISSN:0375-9601
1873-2429
DOI:10.1016/S0375-9601(02)00897-6