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Cavitation Bubbles Generated by Vibrating Quartz Tuning Fork in Liquid 4 He Close to the λ -Transition

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  • Daniel Duda
  • Patrik Švančara
  • Marco La Mantia
  • Miloš Rotter
  • David Schmoranzer
  • Oleg Kolosov
  • Ladislav Skrbek
<mark>Journal publication date</mark>1/06/2017
<mark>Journal</mark>Journal of Low Temperature Physics
Issue number5-6
Number of pages7
Pages (from-to)376-382
Publication StatusPublished
Early online date28/10/16
<mark>Original language</mark>English


We report direct optical observation of cavitation bubbles in liquid helium, both in classical viscous He I and in superfluid He II, close to the λ-transition. Heterogenous cavitation due to the fast-flowing liquid over the rough surface of prongs of a quartz tuning fork oscillating at its fundamental resonant frequency of 4kHz occurs in the form of a cluster of small bubbles rapidly changing its size and position. In accord with previous investigators, we find the cavitation threshold lower in He I than in He II. In He I, the detached bubbles last longer than one camera frame (10 ms), while in He II the cavitation bubbles do not tear off from the surface of the fork up to the highest attainable drive.