Abstract
A quartz fork vibrating at high amplitude is used to study cavitation in He I and He II along the saturated vapor pressure (SVP) curve and at slightly elevated pressures. Cavitation is observed as a breakdown of the resonance response at critical velocity when slowly sweeping the frequency of the drive across the resonance and confirmed by visual observation of a bubble occurring in He II in the space between the prongs of the fork. On decreasing the temperature from 4.2 K along the SVP curve the critical velocity slowly increases from about 0.4 m/s to 1 m/s, until a steep increase up to about 2 m/s occurs within about 20 mK just below the superfluid transition. We discuss our results, including the measured dependence of the critical velocity versus overpressure at fixed bath temperature.
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Blažková, M., Chagovets, T.V., Rotter, M. et al. Cavitation in Liquid Helium Observed in a Flow Due to a Vibrating Quartz Fork. J Low Temp Phys 150, 194–199 (2008). https://doi.org/10.1007/s10909-007-9533-4
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DOI: https://doi.org/10.1007/s10909-007-9533-4