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- W1969603669 abstract "Ultrasonic cavitation was induced in liquid helium using plane and cylindrical standing-wave systems resonant at 89 and 53 kc/sec, respectively. The threshold voltage for cavitation noise was measured at different rotation rates of a shaft, with and without an attached paddle, rotating in the vicinity of the sound field. Below the $ensuremath{lambda}$ point the threshold was found to be lowered sharply at a critical rotation rate ${ensuremath{omega}}_{c}$. The experiments were repeated with five different shaft sizes, and ${ensuremath{omega}}_{c}$ was found to be inversely proportional to ${r}^{2}$, where $r$ is the radius of the shaft. The constant of proportionality was found to be $frac{ensuremath{hbar}}{m}$, where $m$ is the mass of one helium atom. Further, smaller threshold reductions were observed at rotation rates of $2{ensuremath{omega}}_{c}$, with the largest shaft sizes. These results are consistent with the theory of quantized vortex formation and appear to indicate that such vortices play a role in the cavitation nucleation process." @default.
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- W1969603669 date "1967-09-05" @default.
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- W1969603669 title "Production and Detection of Solitary Macroscopic Quantized Vortices in Helium II" @default.
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- W1969603669 doi "https://doi.org/10.1103/physrev.161.202" @default.
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