Flow structure of microbubble-laden turbulent channel flow measured by PIV combined with the shadow image technique |
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| Authors: | Atsuhide Kitagawa Koichi Hishida Yoshiaki Kodama |
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| Affiliation: | (1) Department of Mechanical and System Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyou-ku, Kyoto 606-8585, Japan;(2) Department of System Design Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan;(3) Center for Smart Control of Turbulence, National Maritime Research Institute, 6-38-1 Shinkawa, Mitaka, Tokyo 181-0004, Japan |
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| Abstract: | The turbulence structure of a horizontal channel flow with microbubbles is experimentally investigated using combined particle image velocimetry (PIV) in order to clarify the mechanism of drag reduction caused by microbubbles. A new system which simultaneously measures the liquid phase and the dispersed bubbles is proposed, based on a combination of particle tracking velocimetry (PTV), laser-induced fluorescence (LIF) and the shadow image technique (SIT). To accurately obtain the velocity of the liquid phase, tracer particles which overlap with the bubble shadow images are almost entirely eliminated in the post-processing. Finally, the turbulence characteristics of the flow field are presented, including measurements for both phases, and the bubble effect on the turbulence is quantified. |
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| Keywords: | Microbubble flow Drag reduction Turbulence modification Particle tracking velocimetry (PTV) |
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