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Measurement of Turbulence Modification by Microbubbles Causing Frictional Drag Reduction

[+] Author Affiliations
Atsuhide Kitagawa, Kazuyasu Sugiyama, Yoshiaki Kodama

National Maritime Research Institute, Tokyo, Japan

Masa-aki Ashihara

Industrial Technology Center of Fukui Prefecture, Fukui, Fukui, Japan

Koichi Hishida

Keio University, Yokohama, Kanagawa, Japan

Paper No. FEDSM2003-45648, pp. 675-681; 7 pages
doi:10.1115/FEDSM2003-45648
From:
  • ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
  • Volume 1: Fora, Parts A, B, C, and D
  • Honolulu, Hawaii, USA, July 6–10, 2003
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3696-7 | eISBN: 0-7918-3673-8
  • Copyright © 2003 by ASME

abstract

In this research, in order to clarify the mechanism for drag reduction caused by microbubbles, the turbulence structure of flow field including microbubbles in a horizontal channel is experimentally investigated using particle tracking velocimetry and laser induced fluorescence (PTV/LIF) technique. First, we discuss the particle image velocimetry (PIV) and PTV results for the liquid phase velocity detection. Second, using instantaneous measurement data, we obtain the profiles of the mean velocity, turbulence intensity and Reynolds stress of the liquid phase. In order to obtain the information of both the liquid and gas phases simultaneously, furthermore, we propose a new system based on the combination of PTV, LIF and infrared shadow technique (IST).

Copyright © 2003 by ASME

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