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Dissipation of quasiclassical turbulence in superfluid 4He

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Article number155303
<mark>Journal publication date</mark>9/10/2015
<mark>Journal</mark>Physical review letters
Issue number15
Volume115
Number of pages5
Publication statusPublished
Early online date8/10/15
Original languageEnglish

Abstract

We compare the decay of turbulence in superfluid 4He produced by a moving grid to the decay of urbulence 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 approximately as L / -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.