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- Title
First-sound rarefaction and compression waves in superfluid He-II.
- Authors
Efimov, V. B.; Kolmakov, G. V.; Lebedeva, E. V.; Mezhov-Deglin, L. P.; Trusov, A. B.
- Abstract
The evolution of the form of first-sound waves, excited in superfluid He-II by a pulsed heater, with increasing power Q of the perturbing heat pulse is investigated. In liquid compressed to 13.3 atm, a first-sound rarefaction wave (wave of heating) is observed, which transforms into a compression wave and then into a compression shock wave as Q increases, i.e., the change in the conditions of heat transfer at a solid-He-II interface can be judged according to the change in the form of the sound wave. It follows from our measurements that in He-II compression waves are excited at pressures P ≥ 1 atm primarily as a result of the thermal expansion of a normal He-I liquid layer arising at the He-II-heater interface for power Q above a critical level.
- Subjects
SUPERFLUIDITY; HELIUM
- Publication
JETP Letters, 1999, Vol 69, Issue 10, p767
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.568088