Local measurement of vortex statistics in quantum turbulence
arXiv:2102.10866 · doi:10.1209/0295-5075/134/46002
Abstract
The density fluctuations of quantum vortex lines are measured in a turbulent flow of superfluid He, at temperatures corresponding to superfluid fraction of 16%, 47% and 81%. The probe is a micro-fabricated second sound resonator that allows for local and small-scale measurements in the core of the flow, at a 10-mesh-size behind a grid. 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 an 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.
References in corpus (15)
- Introduction to quantum turbulence
- Turbulent velocity spectra in superfluid flows
- Vortex density spectrum of quantum turbulence
- Energy cascade and the four-fifths law in superfluid turbulence
- Coherent vortex structures in quantum turbulence
- Vortex spectrum in superfluid turbulence: interpretation of a recent experiment
- Energy and Vorticity Spectra in Turbulent Superfluid He from to
- Mesoscale Equipartition of kinetic energy in Quantum Turbulence
- Intermittency of quantum turbulence with superfluid fractions from 0% to 96%
- Vortex density fluctuations in quantum turbulence
- Visualizing Pure Quantum Turbulence in Superfluid He: Andreev Reflection and its Spectral Properties
- Visualization of quantum turbulence in superfluid He-B: Combined numerical/experimental study of Andreev reflection
- Detection of vortex coherent structures in superfluid turbulence
- Scaling of locally averaged energy dissipation and enstrophy density in isotropic turbulence
- Fluctuations of the vortex line density in turbulent flows of quantum fluids