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Ubiquity of particle–vortex interactions in turbulent counterflow of superfluid helium

Published online by Cambridge University Press:  25 January 2021

P. Švančara Open the ORCID record for P. Švančara [Opens in a new window] ,
D. Duda ,
P. Hrubcová ,
M. Rotter Open the ORCID record for M. Rotter [Opens in a new window] ,
L. Skrbek Open the ORCID record for L. Skrbek [Opens in a new window] ,
M. La Mantia Open the ORCID record for M. La Mantia [Opens in a new window] ,
E. Durozoy ,
P. Diribarne Open the ORCID record for P. Diribarne [Opens in a new window] ,
B. Rousset Open the ORCID record for B. Rousset [Opens in a new window]  and
M. Bourgoin Open the ORCID record for M. Bourgoin [Opens in a new window]
...Show all authors
P. Švančara
Affiliation:
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16Prague, Czech Republic
D. Duda
Affiliation:
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16Prague, Czech Republic
P. Hrubcová
Affiliation:
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16Prague, Czech Republic
M. Rotter
Affiliation:
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16Prague, Czech Republic
L. Skrbek
Affiliation:
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16Prague, Czech Republic
M. La Mantia*
Affiliation:
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16Prague, Czech Republic
E. Durozoy
Affiliation:
Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000Grenoble, France
P. Diribarne
Affiliation:
Univ. Grenoble Alpes, CEA IRIG-DSBT, 38000Grenoble, France
B. Rousset
Affiliation:
Univ. Grenoble Alpes, CEA IRIG-DSBT, 38000Grenoble, France
M. Bourgoin
Affiliation:
Laboratoire de Physique, Université Lyon, ENS de Lyon, Université Lyon 1, CNRS, 69342Lyon, France
M. Gibert
Affiliation:
Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000Grenoble, France
*
†Email address for correspondence: [email protected]
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Abstract

Thermal counterflow of superfluid $^4$He is investigated experimentally, by employing the particle tracking velocimetry technique. A flat heater, located at the bottom of a vertical channel of square cross-section, is used to generate this unique type of thermally driven flow. Micronic solid particles, made in situ, probe this quantum flow and their time-dependent positions are collected by a digital camera, in a plane perpendicular to the heat source, away from the channel walls. The experiments are performed at relatively large heating powers, resulting in fluid velocities exceeding $10\ \textrm {mm}\,\textrm {s}^{-1}$, to ensure the existence of sufficiently dense tangles of quantized vortices. Within the investigated parameter range, we observe that the particles intermittently switch between two distinct motion regimes, along their trajectories, that is, a single particle can experience both regimes while travelling upward. The regimes can be loosely associated with fast particles, which are moving away from the heat source along almost straight tracks, and to slow particles, whose erratic upward motion can be said to be significantly influenced by quantized vortices. We propose a separation scheme to study the properties of these regimes and of the corresponding transients between them. We find that particles in both regimes display non-classical, broad distributions of velocity, which indicate the relevance of particle–vortex interactions in both cases. At the same time, we observe that the fast particles move along straighter trajectories than the slow ones, suggesting that the strength of particle–vortex interactions in the two regimes is notably different.

JFM classification

Complex Fluids: Quantum fluids Multiphase and Particle-laden Flows: Particle/fluid flow Turbulent Flows: Turbulent Flows
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 911 , 25 March 2021 , A8
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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Footnotes

‡

Present address: Faculty of Mechanical Engineering, University of West Bohemia, Plzeň, Czech Republic.

§

Present address: Department of Physics, Royal Holloway University of London, Egham, Surrey, United Kingdom.

References

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