Dissipation of Quasiclassical Turbulence in Superfluid 4He

D. E. Zmeev, Paul Walmsley, A. I. Golov, P. V. E. McClintock, S. N. Fisher, W. F. Vinen

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    Abstract

    We compare the decay of turbulence in superfluid 4 He produced by a moving grid to the decay of turbulence created by either impulsive spin-down to rest or by intense ion injection. In all cases, the vortex line density L decays at late time t as L∝t−3/2. At temperatures above 0.8 K, all methods result in the same rate of decay. Below 0.8 K, the spin-down turbulence maintains initial rotation and decays slower than grid turbulence and ion-jet turbulence. This may be due to a decoupling of the large-scale superfluid flow from the normal component at low temperatures, which changes its effective boundary condition from no-slip to slip.
    Original languageEnglish
    Article number115303
    Number of pages5
    JournalPhysical Review Letters
    Volume115
    Issue number15
    DOIs
    Publication statusPublished - 8 Oct 2015

    Keywords

    • quantum turbulence
    • homogeneous isotropic turbulence
    • rotating turbulence
    • grid turbulence
    • dissipation
    • superfluid helium
    • zero temperature limit
    • slip boundary conditions

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