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 |
| Publication status | Published - 2004 Aug |
| Externally published | Yes |
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Keywords
- Bifurcation
- Biological Engineering
- Oscillatory Flow
- Pipe Flow
- Transition
- Turbulence
ASJC Scopus subject areas
- Mechanical Engineering
Cite this
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
}
TY - JOUR
T1 - Transition to turbulence in oscillatory flow through a model pulmonary bifurcation
AU - Tanaka, Gaku
AU - Ueda, Yoshiro
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.
KW - Bifurcation
KW - Biological Engineering
KW - Oscillatory Flow
KW - Pipe Flow
KW - Transition
KW - Turbulence
UR - http://www.scopus.com/inward/record.url?scp=8344276744&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=8344276744&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:8344276744
VL - 70
SP - 2057
EP - 2064
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
SN - 0387-5016
IS - 696
ER -