What question did this study set out to answer?

To investigate the propagation velocity and attenuation of second sound in liquid helium II under uniform rotation.

December 18, 1956Proceedings of the Royal Society of London A Mathematical and Physical Sciences

The rotation of liquid helium II I. Experiments on the propagation of second sound in uniformly rotating helium II

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To investigate the propagation velocity and attenuation of second sound in liquid helium II under uniform rotation.
Measured second sound propagation in uniformly rotating acoustic resonators filled with liquid helium II across frequencies ranging from 1.5 to 4.5 kc/s.
Evaluated second-sound velocity changes and attenuation as a function of angular velocity, wave amplitude, and propagation angle relative to the rotation axis.
Second sound velocity changed by no more than 0.1% during uniform rotation.
Excess attenuation scaled proportionally with angular velocity, was independent of amplitude and frequency (1.5 to 4.5 kc/s), and exhibited an anisotropy where mutual friction parameter B was of order unity perpendicular to the rotation axis but smaller by a factor of at least 5 parallel to it.

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Implication

Laboratory experiment demonstrates anisotropic attenuation of second sound in uniformly rotating liquid helium II, indicating mutual friction between normal and superfluid components.

Cite This Study

Hall et al. (1956) studied this question.

synapsesocial.com/papers/6a979996329299b5dce3339c https://doi.org/10.1098/rspa.1956.0214

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Implication

Laboratory experiment demonstrates anisotropic attenuation of second sound in uniformly rotating liquid helium II, indicating mutual friction between normal and superfluid components.

The rotation of liquid helium II I. Experiments on the propagation of second sound in uniformly rotating helium II

Key Points

Discussion

Implication

Cite This Study

The rotation of liquid helium II I. Experiments on the propagation of second sound in uniformly rotating helium II

Key Points

Discussion

Implication

Cite This Study

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