Turbulence in boundary flow of superfluid He4 triggered by free vortex rings

R. Goto, S. Fujiyama, H. Yano, Y. Nago, N. Hashimoto, K. Obara, O. Ishikawa, M. Tsubota, T. Hata

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

The transition to turbulence in the boundary flow of superfluid He4 is investigated using a vortex-free vibrating wire. At high wire vibration velocities, we found that stable alternating flow around the wire enters a turbulent phase triggered by free vortex rings. Numerical simulations of vortex dynamics demonstrate that vortex rings can attach to the surface of an oscillating obstacle and expand unstably due to the boundary flow of the superfluid, forming turbulence. Experimental investigations indicate that the turbulent phase continues even after stopping the injection of vortex rings, which is also confirmed by the simulations.

Original languageEnglish
Article number045301
JournalPhysical review letters
Volume100
Issue number4
DOIs
Publication statusPublished - 2008 Feb 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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