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Vortex rings in superfluid He-3-B at low temperatures.

Bradley, D. Ian and Fisher, Shaun N. and Guénault, A.M. and Haley, Richard P. and Matthews, C. J. and Pickett, George R. and Roberts, John Edward and O'Sullivan, Samantha and Tsepelin, Viktor (2007) Vortex rings in superfluid He-3-B at low temperatures. Journal of Low Temperature Physics, 148 (3-4). pp. 235-243. ISSN 0022-2291

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Abstract

Turbulence in classical fluids has far-reaching technological implications but is poorly understood. A better understanding might be gained from studying turbulence in quantum systems. In a pure superfluid (at low temperatures), there is no viscosity and vortex lines are quantised. Quantum turbulence consists of a tangle of quantised vortex lines which interact via their self-induced flow. We have recently developed techniques for detecting vortices in superfluid He-3-B in the low temperature limit. We find that the transition to turbulence from a moving grid occurs by the entanglement of emitted vortex rings. Here, we discuss the propagation of the ballistic vortex rings emitted at low grid velocities. We have measured the temperature at which the rings decay before reaching the detectors. Our results, at two different pressures, confirm that the vortex rings decay in accordance with mutual friction.

Item Type: Article
Journal or Publication Title: Journal of Low Temperature Physics
Uncontrolled Keywords: QUANTUM TURBULENCE ; MUTUAL FRICTION ; VELOCITY ; GENERATION ; WIRE
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23475
Deposited By: Dr Richard P. Haley
Deposited On: 23 Jan 2009 14:17
Refereed?: Yes
Published?: Published
Last Modified: 17 Jul 2013 10:22
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23475

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