Transition to quantum turbulence generated by thin vibrating wires in superfluid 4He

H. Yano, T. Ogawa, A. Mori, Y. Miura, Y. Nago, K. Obara, O. Ishikawa, T. Hata

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

We report the turbulent transition in superfluid 4He generated by a vibrating wire as a function of its thickness. The response of a vibrating wire with a 3 μm diameter in superfluid 4He at 1.2 K reveals a hysteresis at the turbulent transition between an up sweep and a down sweep of driving force, while no hysteresis appears for wires with a thickness larger than 4.7 μm diameter. These results indicate that the 3 μm wire is efficient for reducing the number of vortex lines attached to it. A cover box and slow cooling also prevent vortex lines from attaching to a wire, resulting in a vortex-free vibrating wire. The effective mass of the vortex-free vibrating wire is almost constant in a wide range of velocities up to 400 mm/s; however, the wire density estimated from the resonance frequency is a half of the expected value of wire material, suggesting that a wire mass becomes lighter or a wire diameter becomes larger in the superfluid effectively.

Original languageEnglish
Pages (from-to)132-144
Number of pages13
JournalJournal of Low Temperature Physics
Volume156
Issue number3-6
DOIs
Publication statusPublished - 2009 May 18

Keywords

  • Oscillatory flow
  • Quantum turbulence
  • Superfluid helium

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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