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Session: Superfluids 1
Session starts: Wednesday 26 August, 10:30
Presentation starts: 11:30
Room: Room E

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Andrei Golov (The University of Manchester)
Dmitry Zmeev (Lancaster University)
Paul Walmsley (The University of Manchester)
Peter McClintock (Lancaster University)
William Vinen (University of Birmingham)

Abstract:
We compare the decay of turbulence in superfluid 4He produced by a moving grid to the decay of turbulence in the same channel created by either an impulsive spin-down to rest or by intensive ion injection. In all cases the vortex line density L at late time t decays as L ~ t^-3/2. Below 0.8 K, the spin-down turbulence maintains initial rotation and decays slower than grid turbulence and ion-jet turbulence. This is presumably due to the decoupling of the superfluid component from the normal one at large length scales at low temperatures, thus changing its effective boundary condition from no-slip to slip.