Laminar-turbulent transition generated by an oscillating object in superfluid 4He

H. Yano, Y. Nago, R. Goto, K. Obara, O. Ishikawa, T. Hata

研究成果: Article査読

5 被引用数 (Scopus)

抄録

The transition to turbulence in boundary flow of superfluid 4He is investigated using a vibrating wire. An object in a superfluid can easily generate the turbulence by oscillation even at very low temperatures, because remanent vortices are attached to it from the beginning. However, these vortices affect the transition to turbulence, occasionally causing intermittent switchings between laminar and turbulent flows. Recently, we have successfully devised a condition of vortex-free superfluid, in which a vibrating wire cannot generate turbulence. This condition prevents an oscillator from the switchings, enabling us to study the transition from turbulent to laminar flows. Using a vortex-free vibrating wire and a generator of vortex rings, we find that a turbulent state has a lifetime at driving forces near the transition, while it seems to be permanent at high driving forces. Lifetime data scatter widely, suggesting that the transition from turbulent to laminar flows is a probability event.

本文言語English
論文番号032126
ジャーナルJournal of Physics: Conference Series
150
3
DOI
出版ステータスPublished - 2009

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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