Large-scale superfluid vortex rings at nonzero temperatures

We numerically model experiments in which large-scale vortex rings-bundles of quantized vortex loops-are created in superfluid helium by a piston-cylinder arrangement. We show that the presence of a normal-fluid vortex ring together with the quantized vortices is essential to explain the coherence o...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-12, Vol.90 (22)
Main Authors: Wacks, D H, Baggaley, A W, Barenghi, C F
Format: Article
Language:English
Subjects:
Condensed matter
Fluid flow
Fluids
Mathematical models
Superfluidity
Turbulence
Turbulent flow
Vortex rings
Vortices
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Summary:We numerically model experiments in which large-scale vortex rings-bundles of quantized vortex loops-are created in superfluid helium by a piston-cylinder arrangement. We show that the presence of a normal-fluid vortex ring together with the quantized vortices is essential to explain the coherence of these large-scale vortex structures at nonzero temperatures, as observed experimentally. Finally we argue that the interaction of superfluid and normal-fluid vortex bundles is relevant to recent investigations of superfluid turbulence.
ISSN:1098-0121
1550-235X