Volume 81, Number 3, February 2008
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||03 January 2008|
Vortex spectrum in superfluid turbulence: Interpretation of a recent experiment
Institut NÉEL, CNRS/UJF - BP166, F-38042 Grenoble Cedex 9, France
2 School of Mathematics, University of Newcastle - Newcastle upon Tyne, NE1 7RU, UK
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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