Phys. Rev. Lett. 95, 035302 (2005) [4 pages]Emission of Discrete Vortex Rings by a Vibrating Grid In Superfluid 3He-B: A Precursor to Quantum Turbulence
See accompanying Physics Focus We report a transition in the vorticity generated by a grid moving in the B phase of superfluid 3He at T≪Tc. The evolution of the vorticity after arresting the grid shows a dramatic change in the decay rate at a critical grid velocity. We believe this to reflect a sharp transition from ballistic vortex-ring production at low grid velocities to quantum turbulence at higher velocities and that independent isolated vortex rings provide the precursors to the developed turbulence. Furthermore we believe that this may be a feature of all quantum turbulence arising from repetitive mechanical agitation. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.035302
DOI:
10.1103/PhysRevLett.95.035302
PACS:
67.57.Fg, 67.57.De, 67.57.Hi
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