Theory of Sound Propagation in Superfluid Solutions Filled Porous Media

Details Theory of Sound Propagation in Superfluid Solutions Filled Porous Media Theory of Sound Propagation in Superfluid Solutions Filled Porous Media

2005-02-10

arxiv.org/abs/cond-mat/0502259v1

Physics

Condensed Matter

Soft Condensed Matter

13 pages, 0 figures

Scientific paper

10.1088/1742-5468/2005/12/P12008

A theory of the propagation of acoustic waves in a porous medium filled with superfluid solution is developed. The elastic coefficients in the system of equations are expressed in terms of physically measurable quantities. The equations obtained describe all volume modes that can propagate in a porous medium saturated with superfluid solution. Finally, derived equations are applied to the most important particular case when the normal fluid component is locked inside a highly porous media (aerogel) by viscous forces and the velocities of two longitudinal sound modes are calculated.

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