P.-E. Roche and C. F. Barenghi 2008 EPL 81 36002 doi:10.1209/0295-5075/81/36002
P.-E. Roche1 and C. F. Barenghi2
Show affiliationsWe 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).
67.25.dk Vortices and turbulence
47.37.+q Hydrodynamic aspects of superfluidity; quantum fluids
Issue 3 (February 2008)
Received 4 September 2007, accepted for publication 30 November 2007
Published 3 January 2008
P.-E. Roche and C. F. Barenghi 2008 EPL 81 36002
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