Collision Drag Effect on Two-Fluid Hydrodynamics of Superfluid 3He in Aerogel
Abstract
Sound propagation in superfluid He in aerogel is studied on the basis of a two-fluid model taking into account the effect by the drag force due to collisions between He-quasiparticles and aerogel molecules. The drag force plays a role of frictional force between the aerogel and the normal-fluid component. In local equilibrium, they move together in accordance with McKenna {\it et al.}'s model. The deviation from the local equilibrium leads to the damping of sound. We give explicit expressions for the attenuation of longitudinal sounds in this system. We also discuss the sound propagation in a superfluid He-aerogel system embedded in a narrow pore. It is shown that the forth sound propagates in such a system because of the clamping of the normal fluid by the aerogel.
Keywords
Cite
@article{arxiv.cond-mat/0306648,
title = {Collision Drag Effect on Two-Fluid Hydrodynamics of Superfluid 3He in Aerogel},
author = {M. Miura and S. Higashitani and M. Yamamoto and K. Nagai},
journal= {arXiv preprint arXiv:cond-mat/0306648},
year = {2009}
}
Comments
9 pages, no figures, RevTeX