Spectrum and nature of superfluid turbulence

Details Spectrum and nature of superfluid turbulence Spectrum and nature of superfluid turbulence

2012-03-28

arxiv.org/abs/1203.6182v1

Physics

Condensed Matter

Other Condensed Matter

7 pages, 6 figures

Scientific paper

Quantum turbulence can be generated in superfluid helium either thermally (by applying a heat flux, as in counterflow) or mechanically (by stirring the liquid). We compare the two forms of turbulence by computing their energy spectra. We find that in the case of thermal drive (uniform normal fluid velocity) the energy spectrum peaks at intermediate length scales and the vortex tangle is featureless. In the case of mechanical drive (turbulent normal fluid velocity) the energy spectrum has the classical Kolmogorov form observed in ordinary turbulence: the energy is concentrated at the largest scales, and the vortex tangle contains regions of concentrated vorticity.

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