Hydrodynamic equations and collective modes in a system comprising a porous medium and a He 3 – He 4 superfluid mixture

The dynamical equations are obtained for a system comprising a porous material and a He 3 – He 4 superfluid mixture. The elastic coefficients that appear in the equations are expressed in terms of physically measurable quantities. The equations obtained describe all of the bulk modes that propagate...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2006-07, Vol.32 (7), p.621-627
Main Authors: Kekutia, Sh. E., Chkhaidze, N. D.
Format: Article
Language:English
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Summary:The dynamical equations are obtained for a system comprising a porous material and a He 3 – He 4 superfluid mixture. The elastic coefficients that appear in the equations are expressed in terms of physically measurable quantities. The equations obtained describe all of the bulk modes that propagate in a porous medium filled with a He 3 – He 4 superfluid mixture. The propagation of acoustic modes is investigated for an aerogel filled with a He 3 – He 4 superfluid mixture. The velocities of the longitudinal modes propagating in that system are calculated, and the relations between oscillatory quantities are established.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.2216213