Abstract
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 \(\lambda \)-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 \(4\,\mathrm {kHz}\) 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.
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Acknowledgments
We thank Bohumil Vejr and Martin Jackson for valuable help. We acknowledge the support of the Czech Science Foundation—GAČR 16–00580S; D. D. also acknowledges the support of Charles University—GAUK 1968214 and D. S. also acknowledges institutional support under UNCE 2040.
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Duda, D., Švančara, P., La Mantia, M. et al. Cavitation Bubbles Generated by Vibrating Quartz Tuning Fork in Liquid \(^4\)He Close to the \(\lambda \)-Transition. J Low Temp Phys 187, 376–382 (2017). https://doi.org/10.1007/s10909-016-1684-8
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DOI: https://doi.org/10.1007/s10909-016-1684-8