Investigations of oscillating superleak second-sound transducers

Journal Article · Thu Oct 31 23:00:00 EST 1985 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00681632· OSTI ID:6076262

Zimmermann, G; Pobell, F

An investigation has been made of the performance of oscillating superleak transducers with channel diameters 0.1, 0.2, and 0.4 m for excitation and detection of second sound in superfluid UHe. The results indicate that the sound amplitude decreases with increasing channel diameter and increasing temperature due to normal fluid Poiseuille flow in the channels of the oscillating filter paper. The sound amplitude also depends strongly on the surface roughness of the stationary backing plate of the transducers, reaching a maximum for scratches with typical dimensions of about 20 m.

• Research Organization: Physikalisches Institut, Universitaet Bayreuth, Bayreuth, West Germany
• OSTI ID: 6076262
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 61:3; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
EVEN-EVEN NUCLEI
FILTERS
FLUID FLOW
FLUIDS
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LAMINAR FLOW
LIGHT NUCLEI
NUCLEI
OSCILLATIONS
PAPER
QUANTUM FLUIDS
ROUGHNESS
SECOND SOUND
SPECTRA
STABLE ISOTOPES
SUPERFLUIDITY
SURFACE PROPERTIES
SURFACES
TEMPERATURE DEPENDENCE
TRANSDUCERS
ULTRALOW TEMPERATURE