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The Decay of a Quantized Vortex Ring and the Influence of Tracer Particles

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Bewley,  Gregory P.
Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Bewley, G. P., & Sreenivasan, K. R. (2009). The Decay of a Quantized Vortex Ring and the Influence of Tracer Particles. Journal of Low Temperature Physics, 156, 84-94. doi:10.1007/s10909-009-9903-1.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-12DB-2
Abstract
We capture the decay of a quantized vortex ring in superfluid helium-4 by imaging particles trapped on the vortex core. The ring shrinks in time, providing direct evidence for the dissipation of energy in the superfluid. The ring with trapped particles collapses more slowly than predicted by an available theory, but the collapse rate can be predicted correctly if the trapping of the particles on the core is taken into account. We theoretically explore the conditions under which particles may be considered passive tracers of quantized vortices and estimate, in particular, that their dynamics on the large-scale is largely unaffected by the burden of trapped particles if the latter are spaced by more than ten particle diameters along the vortex core, at temperatures between 1.5 K and 2.1 K.