Transition to turbulence in oscillatory flow through a model pulmonary bifurcation

Gaku Tanaka, Yoshiro Ueda, Takashi Okaniwa, Kotaro Oka, Kazuo Tanishita

Research output: Contribution to journalArticlepeer-review


In order to reveal the nature of turbulence in a lung, the measurements of turbulence in the oscillatory flow in a model of bronchial bifurcation were made by a two-colour laser-Doppler velocimeter. Experiments were performed for the Reyonolds number from 1 100 to 10 000, and for the frequency parameter from 3 to 10. The spatial and temporal variation of turbulence were strongly dependent on the secondary flow structure generated by the branch. It was also found that as the frequency parameter became larger, the transition Reynolds number became smaller compared with that for the straight tube.

Original languageEnglish
Pages (from-to)2057-2064
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number696
Publication statusPublished - 2004 Aug
Externally publishedYes


  • Bifurcation
  • Biological Engineering
  • Oscillatory Flow
  • Pipe Flow
  • Transition
  • Turbulence

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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