Vortex density spectrum of quantum turbulence
Philippe-Emmanuel P.-E. Roche (NEEL), Pantxo Diribarne (NEEL,, Phys-ENS), Thomas Didelot (NEEL), Olivier Fran\c{c}ais (GROUPE ESIEE, CNAM),, Lionel Rousseau (GROUPE ESIEE), Herv\'e Willaime (ESPCI)
TL;DR
This study measures vortex density fluctuations in quantum turbulence using second-sound attenuation, revealing a power spectrum consistent with a (-5/3) law, contributing to understanding quantum fluid turbulence.
Contribution
First direct measurement of vortex density spectrum in quantum turbulence using micromachined resonator and second-sound attenuation.
Findings
Vortex density spectrum follows a (-5/3) power law.
Measurement technique effectively probes quantum turbulence.
Discussion on the physical interpretation remains open.
Abstract
The fluctuations of the vortex density in a turbulent quantum fluid are deduced from local second-sound attenuation measurements. These measurements are performed with a micromachined open-cavity resonator inserted across a flow of turbulent He-II near 1.6 K. The power spectrum of the measured vortex line density is compatible with a (-5/3) power law. The physical interpretation, still open, is discussed.
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