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Lookup NU author(s): Dr Demosthenes Kivotides,
Dr David Samuels,
Professor Carlo Barenghi
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We study numerically statistics of superfluid turbulence. We generate a quantized superfiuid vortex tangle driven by a realistic model of normal-fluid turbulence whose energy spectrum obeys Kolmogorov's classical k-5/3 law, where k is the wave number. We find that the resulting superfluid velocity spectrum has approximately a k-1 -dependence for wave numbers of the order of 1/δ and larger, where δ is the average intervortex spacing. This result is similar to what happens in a pure superflow. We also find that the spectrum of the total velocity field follows the classical k-5/3 law, even at temperatures low enough that the normal-fluid mass is only 5% of the total helium mass. We discuss our assumptions and results in view of recent experiments.
Author(s): Kivotides D, Vassilicos CJ, Samuels DC, Barenghi CF
Publication type: Article
Publication status: Published
Journal: Europhysics Letters
Print publication date: 01/01/2002
ISSN (print): 0295-5075
ISSN (electronic): 1286-4854
Publisher: EDP Sciences
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