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Journal of Low Temperature Physics

, Volume 162, Issue 3–4, pp 322–328 | Cite as

Time-of-Flight Experiments of Vortex Rings Propagating from Turbulent Region of Superfluid 4He at High Temperature

  • Y. Nago
  • T. Ogawa
  • K. Obara
  • H. Yano
  • O. Ishikawa
  • T. Hata
Article

Abstract

We report the time-of-flight of quantized vortex rings generated by a vibrating wire in superfluid 4He which contains normal fluid component. A cover box of vibrating wires and slow cooling of superfluid reduce the number of vortices attached to wire surfaces, enabling us to study vortex rings propagating from a turbulent region. Using two vibrating wires as a generator and a detector of vortices, the time-of-flight of vortices propagating a distance of 0.88 mm was measured at 1.25 K. We find that the time-of-flights distribute from 0.06 s to 27.4 s, much larger than the lifetimes of circular vortex rings limited in the size of a generator amplitude. These results imply that large vortex rings with non-circular shape or vortex tangles are created by the generator, propagating slowly and colliding with the detector before complete disappearance.

Keywords

Quantized vortex Quantum turbulence Oscillatory flow Superfluid helium 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Y. Nago
    • 1
  • T. Ogawa
    • 1
  • K. Obara
    • 1
  • H. Yano
    • 1
  • O. Ishikawa
    • 1
  • T. Hata
    • 1
  1. 1.Graduate School of ScienceOsaka City UniversityOsakaJapan

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