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

Atsuhide Kitagawa; Koichi Hishida; Yoshiaki Kodama

doi:10.1007/s00348-004-0926-8

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 journal › Article › peer-review

99 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 language	English
Pages (from-to)	466-475
Number of pages	10
Journal	Experiments in Fluids
Volume	38
Issue number	4
DOIs	https://doi.org/10.1007/s00348-004-0926-8
Publication status	Published - 2005 Apr
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Computational Mechanics
Mechanics of Materials
Physics and Astronomy(all)
Fluid Flow and Transfer Processes

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10.1007/s00348-004-0926-8

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

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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AU - Kitagawa, Atsuhide

AU - Hishida, Koichi

AU - Kodama, Yoshiaki

PY - 2005/4

Y1 - 2005/4

N2 - 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.

AB - 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.

KW - Drag reduction

KW - Microbubble flow

KW - Particle tracking velocimetry (PTV)

KW - Turbulence modification

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

Abstract

Keywords

ASJC Scopus subject areas

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