Volume 134, Number 4, June 2021
|Number of page(s)||7|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||26 July 2021|
Local measurement of vortex statistics in quantum turbulence
Univ. Grenoble Alpes, CNRS, Institut NEEL - F-38042 Grenoble, France
Received: 16 February 2021
Accepted: 18 April 2021
The density fluctuations of quantum vortex lines are measured in a turbulent flow of superfluid He, at temperatures corresponding to superfluid fractions of 16%, 47% and 81%. The probe is a micro-fabricated second sound resonator allowing for local and small-scale measurements in the core of the flow, downstream a grid at a 10-mesh size. Remarkably, all the vortex power spectra collapse on a single master curve, independently from the superfluid fraction and the mean velocity. By contrast with previous measurements, we report a peculiar shape of the power spectra. The vortex density probability distributions are found to be strongly skewed, similarly to the vorticity distributions observed in classical turbulence. Implications of those results are discussed.
© 2021 EPLA
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