Dissipation in vibrating superleak second sound transducers

Journal Article · Wed May 01 04:00:00 EDT 1985 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00683778· OSTI ID:5561375

Giordano, N

We have performed an experimental study of the generation and detection of second sound in /sup 4/He using vibrating superleak second sound transducers. At temperatures well below T/sub lambda/ and for low driving amplitudes, the magnitude of the generated second sound wave is proportional to the drive amplitude. However, near T/sub lambda/ and for high drive amplitudes this is no longer the case--instead, the second sound amplitude saturates. In this regime we also find that overtones of the drive frequency are generated. Our results suggest that this behavior is due to critical velocity effects in the pores of the superleak in the generator transducer. This type of measurement may prove to be a useful way in which to study critical velocity effects in confined geometries.

• Research Organization: Department of Physics, Purdue University, West Lafayette, Indiana
• OSTI ID: 5561375
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 59:3; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL VELOCITY
ELECTRIC POTENTIAL
EVEN-EVEN NUCLEI
FLUIDS
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LEAK DETECTORS
LIGHT NUCLEI
NONLINEAR PROBLEMS
NUCLEI
QUANTUM FLUIDS
SECOND SOUND
STABLE ISOTOPES
TRANSDUCERS
VELOCITY