Combined particle image velocimetry of turbulence modification in a microbubble channel flow

Atsuhide Kitagawa, Koichi Hishida, Yoshiaki Kodama

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The turbulence structure of flow field including microbubbles in a horizontal channel is experimentally investigated using an image processing technique in order to clarify the mechanism for drag reduction caused by microbubbles. A new system for the simultaneous measurement of liquid and dispersed gas phases is proposed, which is based on the combination of Particle Tracking Velocimetry, Laser Induced Fluorescence and Shadow Image Technique (PTV/LIF/SIT). To accurately detect the velocity vectors of the liquid phase in the two coexistent phases, the tracer particles overlapped with bubble shadow images are almost entirely eliminated in the post-processing stage. Finally, turbulence characteristics of the objective flow field are presented with the measurements for both phases obtained by the proposed system. The local interaction between bubbles and surrounding liquid is clarified.

Original languageEnglish
Pages (from-to)44-51
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume71
Issue number701
Publication statusPublished - 2005 Jan
Externally publishedYes

Fingerprint

channel flow
Channel flow
particle image velocimetry
Velocity measurement
flow distribution
Turbulence
bubbles
turbulence
drag reduction
Flow fields
Liquids
liquids
laser induced fluorescence
tracers
image processing
liquid phases
Drag reduction
vapor phases
Bubbles (in fluids)
Image processing

Keywords

  • Drag Reduction
  • Laser Induced Fluorescence
  • Microbubble Flow
  • Particle Tracking Velocimetry
  • Shadow Image Technique
  • Turbulence Modification

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Combined particle image velocimetry of turbulence modification in a microbubble channel flow. / Kitagawa, Atsuhide; Hishida, Koichi; Kodama, Yoshiaki.

In: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 71, No. 701, 01.2005, p. 44-51.

Research output: Contribution to journalArticle

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