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Emission of discrete vortex rings by a vibrating grid in superfluid He-3-B : a precursor to quantum turbulence.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>13/07/2005
<mark>Journal</mark>Physical review letters
Issue number3
Number of pages0
Pages (from-to)035302
Publication StatusPublished
<mark>Original language</mark>English


We report a transition in the vorticity generated by a grid moving in the B phase of superfluid He-3 at T < T-c. 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.