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Journal Articles EPL - Europhysics Letters Year : 2008

Vortex spectrum in superfluid turbulence: interpretation of a recent experiment

Abstract

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, $f^{-5/3}$, 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).
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hal-00169495 , version 1 (04-09-2007)

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Philippe-Emmanuel Roche, Carlo Barenghi. Vortex spectrum in superfluid turbulence: interpretation of a recent experiment. EPL - Europhysics Letters, 2008, 81, pp.36002. ⟨10.1209/0295-5075/81/36002⟩. ⟨hal-00169495⟩

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