Generation of turbulence by oscillating structures in superfluid helium at very low temperatures

The paper is concerned with the interpretation of many experiments that have been reported recently on the production of quantum turbulence by oscillating spheres, wires and grids in both {sup 4}He and {sup 3}He-B at temperatures so low that there is a negligible fraction of normal fluid. The experi...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2007-02, Vol.75 (6), Article 064502
Main Authors: Hänninen, R., Tsubota, M., Vinen, W. F.
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL VELOCITY
DRAG
HELIUM
HELIUM 3
HELIUM 4
NUCLEATION
SIMULATION
SUPERFLUIDITY
TEMPERATURE RANGE 0013-0065 K
TURBULENCE
VORTICES
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Summary:The paper is concerned with the interpretation of many experiments that have been reported recently on the production of quantum turbulence by oscillating spheres, wires and grids in both {sup 4}He and {sup 3}He-B at temperatures so low that there is a negligible fraction of normal fluid. The experimental results are compared with those obtained in analogous experiments with classical fluids and with preliminary simulations of the quantum turbulence. Particular attention is paid to observed values of drag coefficients and to the very different critical velocities observed in {sup 4}He and {sup 3}He. It is tentatively concluded that in the case of {sup 4}He behavior may well be similar to that observed in the classical analogues, with relatively small changes when the characteristic size of the oscillating structure is not large compared with the quantized vortex spacing, but that in the case of {sup 3}He behavior is very different and due perhaps to very rapid intrinsic nucleation of the quantized vortices.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.75.064502