Investigation of properties of superfluid He4 turbulence using a hot-wire signal

P. Diribarne, M. Bon Mardion, A. Girard, J.-P. Moro, B. Rousset, F. Chilla, J. Salort, A. Braslau, F. Daviaud, B. Dubrulle, B. Gallet, I. Moukharski, E.-W. Saw, C. Baudet, M. Gibert, P.-E. Roche, E. Rusaouen, Andrei Golov, Victor L'vov, and Sergey Nazarenko
Phys. Rev. Fluids 6, 094601 – Published 8 September 2021

Abstract

We report hot-wire measurements performed in two very different, co- and counterrotating flows, in normal and superfluid helium at 1.6K, 2K, and 2.3K. As recently reported, the power spectrum of the hot-wire signal in superfluid flows exhibits a significant bump at high frequency [Diribarne et al., Phys. Rev. B 103, 144509 (2021)]. We confirm that the bump frequency does not depend significantly on the temperature and further extend the previous analysis of the velocity dependence of the bump, over more than one decade of velocity. The main result is that the bump frequency depends on the turbulence intensity of the flow, and that using the turbulent Reynolds number rather than the velocity as a control parameter collapses results from both co- and counterrotating flows. The vortex shedding model previously proposed, in its current form, does not account for this observation. This suggests that the physical origin of the bump is related to the small scale turbulence properties of the flow. We finally propose some qualitative physical mechanism by which the smallest structures of the flow, at intervortex distance, could affect the heat flux of the hot wire.

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  • Received 31 May 2021
  • Accepted 24 August 2021

DOI:https://doi.org/10.1103/PhysRevFluids.6.094601

©2021 American Physical Society

Physics Subject Headings (PhySH)

Fluid DynamicsCondensed Matter, Materials & Applied Physics

Authors & Affiliations

P. Diribarne, M. Bon Mardion, A. Girard, J.-P. Moro, and B. Rousset

  • University of Grenoble Alpes, IRIG-DSBT, F-38000 Grenoble, France

F. Chilla and J. Salort

  • University of Lyon, ENS de Lyon, Claude Bernard University, CNRS, Laboratoire de Physique, Lyon, France

A. Braslau, F. Daviaud, B. Dubrulle, B. Gallet, I. Moukharski, and E.-W. Saw

  • Laboratoire SPHYNX, CEA/IRAMIS/SPEC, CNRS URA 2464, F-91191 Gif-sur-Yvette, France

C. Baudet

  • CNRS, LEGI, F-38041 Grenoble, France

M. Gibert, P.-E. Roche, and E. Rusaouen

  • Univ. Grenoble Alpes, Institut NEEL, F-38042 Grenoble, France

Andrei Golov

  • Department of Physics and Astronomy, The University of Manchester, Manchester MP13 9PL, United Kingdom

Victor L'vov

  • Department of Chemical and Biological Physics, Weizmann Institute of Science, 7610001 Rehovot, Israel

Sergey Nazarenko

  • Institut de Physique de Nice, Université Nice-Sophia Antipolis, Parc Valrose, 06108 Nice, France

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Issue

Vol. 6, Iss. 9 — September 2021

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