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Lookup NU author(s): Professor Carlo Barenghi
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Nucleation of vortex rings accompanies the collapse of ultrasound bubbles in superfluids. Using the Gross-Pitaevskii equation for a uniform condensate we elucidate the various stages of the collapse of a stationary spherically symmetric bubble and establish conditions necessary for vortex nucleation. The minimum radius of the stationary bubble, whose collapse leads to vortex nucleation, was found to be 28+/-1 healing lengths. The time after which the nucleation becomes possible is determined as a function of the bubble's radius. We show that vortex nucleation takes place in moving bubbles of even smaller radius if the motion makes them sufficiently oblate.
Author(s): Berloff NG, Barenghi CF
Publication type: Article
Publication status: Published
Journal: Physical Review Letters
ISSN (print): 0031-9007
ISSN (electronic): 1079-7114
Publisher: American Physical Society
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