Damping of fourth sound in /sup 4/He due to normal fluid flow

Journal Article · Fri Mar 01 04:00:00 EST 1985 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00681140· OSTI ID:5547825

Tam, W Y; Ahlers, G

Measurements of the attenuation of fourth sound were made in superfluid /sup 4/He contained in several porous media with characteristic sizes sufficiently large to permit some normal fluid flow. The data are for pressures between vapor pressure and 25 bar and for temperatures between 1.4 K and the lambda-line. The attenuation was dominated by viscous dissipation associated with the normal fluid flow. For a given medium, it varied by nearly two orders of magnitude over the pressure and temperature range of the experiment. Analysis of the data alog isobars and isotherms in terms of an idealized model for the porous medium yielded a unique temperature- and pressure-independent characteristic size for each medium.

• Research Organization: Department of Physics, University of California, Santa Barbara, California
• OSTI ID: 5547825
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 58:5; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DAMPING
DATA
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FLUID FLOW
FLUIDS
FOURTH SOUND
HELIUM 4
HELIUM II
HELIUM ISOTOPES
INFORMATION
ISOTOPES
LIGHT NUCLEI
MATERIALS
MEDIUM PRESSURE
NUCLEI
NUMERICAL DATA
POROUS MATERIALS
QUANTUM FLUIDS
SOUND WAVES
STABLE ISOTOPES
SUPERFLUIDITY
ULTRALOW TEMPERATURE
VELOCITY
VISCOUS FLOW