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Mutual-friction induced instability of normal-fluid vortex tubes in superfluid helium-4

Kivotides, Demosthenes (2018) Mutual-friction induced instability of normal-fluid vortex tubes in superfluid helium-4. Physics Letters A, 382 (22). pp. 1481-1485. ISSN 0375-9601

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    Abstract

    It is shown that, as a result of its interactions with superfluid vorticity, a normal-fluid vortex tube in helium-4 becomes unstable and disintegrates. The superfluid vorticity acquires only a small (few percents of normal-fluid tube strength) polarization, whilst expanding in a front-like manner in the intervortex space of the normal-fluid, forming a dense, unstructured tangle in the process. The accompanied energy spectra scalings offer a structural explanation of analogous scalings in fully developed finite-temperature superfluid turbulence. A macroscopic mutual-friction model incorporating these findings is proposed.

    Item type:Article
    ID code:63691
    Keywords:turbulence, vortices, computation, Physics, Physics and Astronomy(all)
    Subjects:Science > Physics
    Department:Faculty of Engineering > Chemical and Process Engineering
    Depositing user: Pure Administrator
    Date deposited:11 Apr 2018 15:13
    Last modified:05 Jun 2019 03:35
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/63691
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