What question did this study set out to answer?

To measure and theoretically describe the period of small torsional oscillations in an Andronikashvili disk system within uniformly rotating liquid helium II.

July 8, 1958Proceedings of the Royal Society of London A Mathematical and Physical Sciences

An Experimental and theoretical study of torsional oscillations in uniformly rotating liquid helium II

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HHH. E. HallUniversity of Manchester

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Implication

Experimental study demonstrates vortex wave dynamics in rotating liquid helium II, confirming Onsager-Feynman theoretical predictions.

Key Points

To measure and theoretically describe the period of small torsional oscillations in an Andronikashvili disk system within uniformly rotating liquid helium II.
Measured oscillation periods of an Andronikashvili disk system superposed on uniform rotation at angular velocity ω0 with varying disk separations and surface roughness.
Modeled hydrodynamic effects using the Onsager-Feynman vortex line framework, incorporating transverse wave propagation along pinned vortex lines.
Observed monotonic increase of effective density ratio ρ'/ρs from 0 to 1 with increasing rotation speed and disk separation when rotation frequency greatly exceeded oscillation frequency (ω0 ≫ Ω).
Detected resonance-dispersion behavior with positive or negative effective density values when rotation frequency was much lower than oscillation frequency (ω0 ≪ Ω).
Calculated the vortex parameter v = (8.5 ± 1.5) × 10⁻⁴ cm²s⁻¹, yielding a value roughly 25% lower than Feynman's theoretical estimate.

Cite This Study

H. E. Hall (1958) studied this question.

synapsesocial.com/papers/6a853cb79df997f4bbd6a2fd https://doi.org/10.1098/rspa.1958.0100

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An Experimental and theoretical study of torsional oscillations in uniformly rotating liquid helium II

Discussion

Member takes

Implication

Key Points

Cite This Study

An Experimental and theoretical study of torsional oscillations in uniformly rotating liquid helium II

Discussion

Member takes

Implication

Key Points

Cite This Study

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