Cavitation in liquid helium using a vibrating piston

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Abstract
Experiments have been performed in which a piston is vibrated inside a glass tube containing liquid helium. The piston was driven by an electromagnetic shaker in the frequency range 20–80 Hz at an intensity capable of generating cavitation effects. At critical particle velocity amplitudes of a few centimeters per second noise is generated. This threshold velocity appears to be independent of frequency. A much higher velocity, about an order of magnitude greater, is required to produce visible bubbles in superfluid Helium II, but the two thresholds are the same in Helium I. The results are believed to indicate that fluid dynamic effects are important in cavitation nucleation. Subject Classification: [43]25.60; [43]35.32, [43]35.47.

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