Flow structure of microbubble-laden turbulent channel flow measured by PIV combined with the shadow image technique

Atsuhide Kitagawa, Koichi Hishida, Yoshiaki Kodama

Research output: Contribution to journalArticle

72 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)466-475
Number of pages10
JournalExperiments in Fluids
Volume38
Issue number4
DOIs
Publication statusPublished - 2005 Apr

Fingerprint

channel flow
Channel flow
Flow structure
particle image velocimetry
Velocity measurement
Turbulence
bubbles
turbulence
Bubbles (in fluids)
liquid phases
drag reduction
Drag reduction
Liquids
laser induced fluorescence
tracers
Flow fields
flow distribution
Fluorescence
Lasers
Processing

Keywords

  • Drag reduction
  • Microbubble flow
  • Particle tracking velocimetry (PTV)
  • Turbulence modification

ASJC Scopus subject areas

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Mechanics of Materials
  • Computational Mechanics

Cite this

Flow structure of microbubble-laden turbulent channel flow measured by PIV combined with the shadow image technique. / Kitagawa, Atsuhide; Hishida, Koichi; Kodama, Yoshiaki.

In: Experiments in Fluids, Vol. 38, No. 4, 04.2005, p. 466-475.

Research output: Contribution to journalArticle

Kitagawa, Atsuhide ; Hishida, Koichi ; Kodama, Yoshiaki. / Flow structure of microbubble-laden turbulent channel flow measured by PIV combined with the shadow image technique. In: Experiments in Fluids. 2005 ; Vol. 38, No. 4. pp. 466-475.
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