Strong anisotropy of superfluid He-4 counterflow turbulence

L. Biferale; D. Khomenko; V. S. L'vov; A. Pomyalov; Itamar Procaccia; G. Sahoo

doi:10.1103/PhysRevB.100.134515

Strong anisotropy of superfluid He-4 counterflow turbulence

L. Biferale^*, D. Khomenko, V. S. L'vov, A. Pomyalov, Itamar Procaccia, G. Sahoo

^*Corresponding author for this work

Department of Chemical and Biological Physics

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

We report on a combined theoretical and numerical study of counterflow turbulence in superfluid He-4 in a wide range of parameters. The energy spectra of the velocity fluctuations of both the normal-fluid and superfluid components are strongly anisotropic. The angular dependence of the correlation between velocity fluctuations of the two components plays the key role. A selective energy dissipation intensifies as scales decrease, with the streamwise velocity fluctuations becoming dominant. Most of the flow energy is concentrated in a wave-vector plane which is orthogonal to the direction of the counterflow. The phenomenon becomes more prominent at higher temperatures as the coupling between the components depends on the temperature and the direction with respect to the counterflow velocity.

Original language	English
Article number	134515
Number of pages	15
Journal	Physical Review B
Volume	100
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.100.134515
Publication status	Published - 28 Oct 2019

Bibliographical note

L.B. thanks Michele Buzzicotti for the data analysis and visualization. G.S. thanks AtMath collaboration at University of Helsinki. A.P. and V.L. acknowledge a useful discussion with L. Skrbek. We acknowledge funding from the Prace project “Superfluid Turbulence under counterflows” Pra12 3088.

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10.1103/PhysRevB.100.134515

http://arxiv.org/abs/1908.01144Licence: Other

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title = "Strong anisotropy of superfluid He-4 counterflow turbulence",

abstract = "We report on a combined theoretical and numerical study of counterflow turbulence in superfluid He-4 in a wide range of parameters. The energy spectra of the velocity fluctuations of both the normal-fluid and superfluid components are strongly anisotropic. The angular dependence of the correlation between velocity fluctuations of the two components plays the key role. A selective energy dissipation intensifies as scales decrease, with the streamwise velocity fluctuations becoming dominant. Most of the flow energy is concentrated in a wave-vector plane which is orthogonal to the direction of the counterflow. The phenomenon becomes more prominent at higher temperatures as the coupling between the components depends on the temperature and the direction with respect to the counterflow velocity.",

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AU - Khomenko, D.

AU - L'vov, V. S.

AU - Pomyalov, A.

AU - Procaccia, Itamar

AU - Sahoo, G.

N1 - L.B. thanks Michele Buzzicotti for the data analysis and visualization. G.S. thanks AtMath collaboration at University of Helsinki. A.P. and V.L. acknowledge a useful discussion with L. Skrbek. We acknowledge funding from the Prace project “Superfluid Turbulence under counterflows” Pra12 3088.

PY - 2019/10/28

Y1 - 2019/10/28

N2 - We report on a combined theoretical and numerical study of counterflow turbulence in superfluid He-4 in a wide range of parameters. The energy spectra of the velocity fluctuations of both the normal-fluid and superfluid components are strongly anisotropic. The angular dependence of the correlation between velocity fluctuations of the two components plays the key role. A selective energy dissipation intensifies as scales decrease, with the streamwise velocity fluctuations becoming dominant. Most of the flow energy is concentrated in a wave-vector plane which is orthogonal to the direction of the counterflow. The phenomenon becomes more prominent at higher temperatures as the coupling between the components depends on the temperature and the direction with respect to the counterflow velocity.

AB - We report on a combined theoretical and numerical study of counterflow turbulence in superfluid He-4 in a wide range of parameters. The energy spectra of the velocity fluctuations of both the normal-fluid and superfluid components are strongly anisotropic. The angular dependence of the correlation between velocity fluctuations of the two components plays the key role. A selective energy dissipation intensifies as scales decrease, with the streamwise velocity fluctuations becoming dominant. Most of the flow energy is concentrated in a wave-vector plane which is orthogonal to the direction of the counterflow. The phenomenon becomes more prominent at higher temperatures as the coupling between the components depends on the temperature and the direction with respect to the counterflow velocity.

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DO - 10.1103/PhysRevB.100.134515

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Strong anisotropy of superfluid He-4 counterflow turbulence

Abstract

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