| Issue |
EPL
Volume 81, Number 3, February 2008
|
|
|---|---|---|
| Article Number | 36002 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/81/36002 | |
| Published online | 03 January 2008 | |
Vortex spectrum in superfluid turbulence: Interpretation of a recent experiment
1
Institut NÉEL, CNRS/UJF - BP166, F-38042 Grenoble Cedex 9, France
2
School of Mathematics, University of Newcastle - Newcastle upon Tyne, NE1 7RU, UK
Received:
4
September
2007
Accepted:
30
November
2007
We discuss a recent experiment in which the spectrum of the
vortex line density fluctuations has been measured in superfluid turbulence.
The observed frequency dependence of the spectrum, 
, disagrees with classical vorticity spectra if, following the literature, the vortex line
density is interpreted as a measure of the vorticity or enstrophy. We argue that the
disagrement is solved if the vortex line density field is decomposed into
a polarised field (which carries most of the energy) and an isotropic field (which is responsible for the spectrum).
PACS: 67.40.Vs – Vortices and turbulence / 47.37.+q – Hydrodynamic aspects of superfluidity: quantum fluids / 67.57.De – Quantum fluids and solids; liquid and solid helium: Superflow and hydrodynamics
© EPLA, 2008
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