Dissipation of Quasiclassical Turbulence in Superfluid ${}^4$He

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 $L\propto t^{-3/2}$. 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.

Main article: 5 pages, 3 figures. Supplemental material: 4 pages, 3 figures. Accepted for publication in Physical Review Letters

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