Transition to turbulence in oscillatory flow through a model pulmonary bifurcation

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

doi:10.1299/kikaib.70.2057

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 journal › Article › peer-review

Abstract

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 language	English
Pages (from-to)	2057-2064
Number of pages	8
Journal	Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume	70
Issue number	696
DOIs	https://doi.org/10.1299/kikaib.70.2057
Publication status	Published - 2004 Aug
Externally published	Yes

Keywords

Bifurcation
Biological Engineering
Oscillatory Flow
Pipe Flow
Transition
Turbulence

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering

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10.1299/kikaib.70.2057

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Transition to turbulence in oscillatory flow through a model pulmonary bifurcation. / Tanaka, Gaku; Ueda, Yoshiro; Okaniwa, Takashi; Oka, Kotaro; Tanishita, Kazuo.

In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 70, No. 696, 08.2004, p. 2057-2064.

Research output: Contribution to journal › Article › peer-review

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abstract = "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.",

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AU - Okaniwa, Takashi

AU - Oka, Kotaro

AU - Tanishita, Kazuo

PY - 2004/8

Y1 - 2004/8

N2 - 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.

AB - 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.

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KW - Pipe Flow

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KW - Turbulence

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JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

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Transition to turbulence in oscillatory flow through a model pulmonary bifurcation

Abstract

Keywords

ASJC Scopus subject areas

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