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

Atsuhide Kitagawa, Koichi Hishida, Yoshiaki Kodama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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
Issue number701
Publication statusPublished - 2005 Jan


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

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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