Fully Coupled Two-Fluid Dynamics in Superfluid He 4: Anomalous Anisotropic Velocity Fluctuations in Counterflow

Satoshi Yui, Hiromichi Kobayashi, Makoto Tsubota, Wei Guo

研究成果: Article査読

14 被引用数 (Scopus)

抄録

We investigate the thermal counterflow of the superfluid He4 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 ones. The anomalous fluctuations are consistent with visualization experiments [Mastracci et al., Phys. Rev. Fluids 4, 083305 (2019)PLFHBR2469-990X10.1103/PhysRevFluids.4.083305], and our results confirm their analysis with simple models on the anisotropic fluctuations. This success validates the model of the fully coupled dynamics and paves the way for solving some outstanding problems in this two-fluid system.

本文言語English
論文番号155301
ジャーナルPhysical review letters
124
15
DOI
出版ステータスPublished - 2020 4月 17

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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