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| VOLUME 83 | ISSUE 3 |
PAGE 157
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| Energy spectra of quantum turbulence in He II and 3He-B - a unified view
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L. Skrbek
Joint Low Temperature Laboratory, Institute of Physics ASCR
Faculty of Mathematics and Physics, Charles University, 180 00 Prague, Czech Republic
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PACS: 47.27.Ak, 67.40.Vs, 67.57.De
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Abstract
Quantum turbulence in superfluid He II and in 3He-B
that can be regarded as nearly isothermal, isotropic and
homogeneous is discussed within the two-fluid model. A general
form of the 3D energy spectrum is proposed: at large length
scales, where normal and superfluid eddies are locked together by
the mutual friction force, the energy spectrum is essentially
classical and includes an inertial range of a Kolmogorov K62-form.
With increasing wavenumber, k, the normal fluid part of the
spectrum terminates due to finite viscosity while the superfluid
part of the spectral energy density changes towards k-3 and
then back into Kolmogorov-like k-5/3 again.
Agreement with computer simulations and experiments is claimed if
account is taken of the turbulent box size and of the energy decay
rate.
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