Accession Number:

AD0735924

Title:

Attenuation of Third Sound in Liquid Helium and the Stability of Multiply Quantized Persistent Circulations of a Thin Helium Film in the Landau Region.

Descriptive Note:

Technical rept.,

Corporate Author:

CALIFORNIA UNIV LOS ANGELES DEPT OF PHYSICS

Personal Author(s):

• Wang,Taylor Gun-Jin

Report Date:

1971-10-01

Pagination or Media Count:

106.0

Abstract:

The attenuation coefficiency has been measured by generating a third sound in a He II film coating a cylinder and observing the decay of pulses which propagate in both directions around the axis of the cylinder. Observed attenuations can be divided into three regions. The stability of multiply quantized persistent circulations was investigated by measuring the relative velocity of two third-sound waves thermally generated from two parallel aluminum strips and detected by a superconductor strip midway between them. The author concludes that persistent currents with high quantum numbers are unstable in times of the order of that of the experiment, namely 160 sec. Author

Descriptors:

• (*SUPERFLUIDITY
• HEAT TRANSFER)
• (*HELIUM
• TRANSPORT PROPERTIES)
• LIQUEFIED GASES
• DIELECTRIC FILMS
• VELOCITY
• ATTENUATION

Subject Categories:

• Physical Chemistry
• Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE