Abstract
The effect of the introduction of swirling motion into turbulent flow in a curved pipe is studied experimentally. The friction of the flow in a straight pipe is known to increase as the introduced swirling motion intensifies. In the present study, it is found that the friction in a curved pipe is reduced when weak swirling motion is provided. In order to investigate this drag reduction, velocity distributions are measured at some cross sections in the curved pipe by use of the rotating probe technique with an inclined hot-wire. Detailed measurements of the velocity field reveal that interesting swingback phenomena appear as the vortical flow structure develops from the entrance of the pipe, which may cause the drag reduction in case of weak swirls.
| Original language | English |
|---|---|
| Pages (from-to) | 997-1003 |
| Number of pages | 7 |
| Journal | Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B |
| Volume | 66 |
| Issue number | 644 |
| Publication status | Published - Apr 2000 |
| Externally published | Yes |
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Keywords
- Curved pipe
- Drag reduction
- Secondary flow
- Swirling flow
- Three-dimensional flow
- Turbulent flow
- Vortex
ASJC Scopus subject areas
- Mechanical Engineering
- Condensed Matter Physics
Cite this
Drag reduction of turbulent flows in a curved pipe due to the swirling instability. / Takami, Toshïro; Yanase, Shinichiro; Maruyama, Yuichi; Araki, Keisuke.
In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 66, No. 644, 04.2000, p. 997-1003.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Drag reduction of turbulent flows in a curved pipe due to the swirling instability
AU - Takami, Toshïro
AU - Yanase, Shinichiro
AU - Maruyama, Yuichi
AU - Araki, Keisuke
PY - 2000/4
Y1 - 2000/4
N2 - The effect of the introduction of swirling motion into turbulent flow in a curved pipe is studied experimentally. The friction of the flow in a straight pipe is known to increase as the introduced swirling motion intensifies. In the present study, it is found that the friction in a curved pipe is reduced when weak swirling motion is provided. In order to investigate this drag reduction, velocity distributions are measured at some cross sections in the curved pipe by use of the rotating probe technique with an inclined hot-wire. Detailed measurements of the velocity field reveal that interesting swingback phenomena appear as the vortical flow structure develops from the entrance of the pipe, which may cause the drag reduction in case of weak swirls.
AB - The effect of the introduction of swirling motion into turbulent flow in a curved pipe is studied experimentally. The friction of the flow in a straight pipe is known to increase as the introduced swirling motion intensifies. In the present study, it is found that the friction in a curved pipe is reduced when weak swirling motion is provided. In order to investigate this drag reduction, velocity distributions are measured at some cross sections in the curved pipe by use of the rotating probe technique with an inclined hot-wire. Detailed measurements of the velocity field reveal that interesting swingback phenomena appear as the vortical flow structure develops from the entrance of the pipe, which may cause the drag reduction in case of weak swirls.
KW - Curved pipe
KW - Drag reduction
KW - Secondary flow
KW - Swirling flow
KW - Three-dimensional flow
KW - Turbulent flow
KW - Vortex
UR - http://www.scopus.com/inward/record.url?scp=71149097462&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=71149097462&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:71149097462
VL - 66
SP - 997
EP - 1003
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 - 644
ER -