The Dynamics of Vortex Generation in Superfluid 3He-B

A profound change occurs in the stability of quantized vortices in externally applied flow of superfluid 3 He-B at temperatures ≲0.6  T c , owing to the rapidly decreasing damping in vortex motion with decreasing temperature. At low damping an evolving vortex may become unstable and generate a new i...

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Bibliographic Details
Published in:Journal of low temperature physics 2008-12, Vol.153 (5-6), p.197-227
Main Authors: de Graaf, R., Hänninen, R., Chagovets, T. V., Eltsov, V. B., Krusius, M., Solntsev, R. E.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Computational fluid dynamics
Condensed Matter Physics
Fluid flow
Instability
Magnetic Materials
Magnetism
Physics
Physics and Astronomy
Stability
Turbulence
Turbulent flow
Vortices
Walls
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Summary:A profound change occurs in the stability of quantized vortices in externally applied flow of superfluid 3 He-B at temperatures ≲0.6  T c , owing to the rapidly decreasing damping in vortex motion with decreasing temperature. At low damping an evolving vortex may become unstable and generate a new independent vortex loop. This single-vortex instability is the generic precursor of turbulence. We investigate the instability with non-invasive NMR measurements on a rotating cylindrical sample in the intermediate temperature regime (0.3–0.6)  T c . From comparisons with numerical calculations we interpret that the instability occurs at the container wall, when the vortex end moves along the wall in applied flow.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-008-9827-1