Coexistence of quantum and classical flows in quantum turbulence in the T=0 limit

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    Abstract

    Tangles of quantized vortex line of initial density {\cal L}(0) \sim 6\times 10^3\,cm-2 and variable amplitude of fluctuations of flow velocity U(0) at the largest length scale were generated in superfluid 4He at T=0.17\,K, and their free decay {\cal L}(t) was measured. If U(0) is small, the excess random component of vortex line length firstly decays as {\cal L} \propto t-1 until it becomes comparable with the structured component responsible for the classical velocity field, and the decay changes to {\cal L} \propto t-3/2. The latter regime always ultimately prevails, provided the classical description of U holds. A quantitative model of coexisting cascades of quantum and classical energies describes all regimes of the decay.
    Original languageEnglish
    Article number134501
    JournalPhysical Review Letters
    Volume118
    DOIs
    Publication statusPublished - 29 Mar 2017

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