Fully coupled dynamics of the two fluids in superfluid 4He: Anomalous anisotropic velocity fluctuations in counterflow

Satoshi Yui, Hiromichi Kobayashi, Makoto Tsubota, Wei Guo

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate the thermal counterflow of the superfluid 4He by numerically simulating three-dimensional fully coupled dynamics of the two fluids, namely quantized vortices and a normal fluid. We analyze the velocity fluctuations of the laminar normal fluid arising from the mutual friction with the quantum turbulence of the superfluid component. The streamwise fluctuations exhibit higher intensity and longer-range autocorrelation, as compared to transverse fluctuations. Those anomalous fluctuations are consistent with the experiments. The fluctuations will trigger the transition of the normal fluid to turbulence unlike single-component flows.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2019 Nov 5

ASJC Scopus subject areas

  • General

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