Pressure release superleak sound modes in He II

Journal Article · Sat Mar 01 04:00:00 EST 1980 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00115493· OSTI ID:5459632

Heckerman, D; Rosenbaum, R; Putterman, S; Williams, G A

The sound modes of He II in a waveguide partially packed with superleak are investigated for the case of a free surface within the waveguide. In the limit of zero vapor density, two propagating modes are found: one a gravity wave whose velocity depends on the superfluid fraction, and the other a temperature wave which is analogous to adiabatic U-tube oscillations. With finite vapor the U-tube mode in pure /sup 4/He mixes strongly with the vapor sound; however, in /sup 3/He--/sup 4/He mixtures it is uncoupled from the vapor and is observable. Experimental results are in qualitative agreement with the theory.

• Research Organization: Department of Physics, University of California, Los Angeles, California
• OSTI ID: 5459632
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 38:5; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DISPERSIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUIDS
GASES
GRAVITY WAVES
HELIUM 3
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MIXTURES
NUCLEI
QUANTUM FLUIDS
SOUND WAVES
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
VAPORS
WAVE PROPAGATION
WAVEGUIDES