The characteristics of vortex structures and turbulent events of drag-reducing surfactant (CTAC) solution flows in a two-dimensional channel have been studied using particle image velocimetry (PIV) to measure the instantaneous velocity fields in a streamwise-wall-normal plane. Through visualizing the instantaneous velocity field, contour maps of the swirling strength and instantaneous value of uv, the characteristic angle of vortex packets was quantified, and it was shown that the drag-reducing CTAC additive reduced both the strength and frequency of turbulent bursts near the wall, and that the characteristics of vortex structures and bursts were not only dependent on drag-reduction level but also on concentration of additive. Based on the quantified parameters characterizing turbulent events in a wall-bounded turbulent flow, a model of turbulent contribution to the friction factor, fT, was proposed. It was obtained that fT was linearly proportional to the product of frequency and strength of turbulent events.
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ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
July 11–15, 2004
Charlotte, North Carolina, USA
Conference Sponsors:
- Heat Transfer Division and Fluids Engineering Division
ISBN:
0-7918-4690-3
PROCEEDINGS PAPER
Influence of Drag-Reducing Surfactant Additives on Vortex Structures and Turbulent Events in a Channel Flow
Feng-Chen Li,
Feng-Chen Li
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
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Yasuo Kawaguchi,
Yasuo Kawaguchi
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
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Takehiko Segawa,
Takehiko Segawa
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
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Koichi Hishida
Koichi Hishida
Keio University, Yokohama, Japan
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Feng-Chen Li
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
Yasuo Kawaguchi
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
Takehiko Segawa
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
Koichi Hishida
Keio University, Yokohama, Japan
Paper No:
HT-FED2004-56119, pp. 103-110; 8 pages
Published Online:
February 24, 2009
Citation
Li, F, Kawaguchi, Y, Segawa, T, & Hishida, K. "Influence of Drag-Reducing Surfactant Additives on Vortex Structures and Turbulent Events in a Channel Flow." Proceedings of the ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. Volume 1. Charlotte, North Carolina, USA. July 11–15, 2004. pp. 103-110. ASME. https://doi.org/10.1115/HT-FED2004-56119
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