Effect of bubble diameter on modification of turbulence in an upward pipe flow

Akiko Fujiwara; Daijyu Minato; Koichi Hishida

doi:10.1016/j.ijheatfluidflow.2004.02.018

Effect of bubble diameter on modification of turbulence in an upward pipe flow

Akiko Fujiwara, Daijyu Minato, Koichi Hishida

Department of System Design Engineering

Research output: Contribution to journal › Article › peer-review

71 Citations (Scopus)

Abstract

The experimental study in vertical upward driven bubbly pipe flow with void fractions of 0.5% and 1.0% is conducted to elucidate the effect of dispersed bubble size on turbulence modification. Liquid phase velocity is measured by particle image velocimetry with fluorescent tracer particles (PIV/LIF). Bubble size and velocity are estimated from the bubble image observed by a projected shadow image technique. Bubbles strongly accumulate near the wall which accelerate the liquid phase. The high concentration of bubbles in the vicinity of the wall induces a reduction of the fluctuation velocity intensity of the liquid. The effect of bubble-induced turbulence on the global pipe flow structure was investigated by the turbulence energy production and dissipation, estimated from the experiment data, and local vortical structure around the bubbles.

Original language	English
Pages (from-to)	481-488
Number of pages	8
Journal	International Journal of Heat and Fluid Flow
Volume	25
Issue number	3
DOIs	https://doi.org/10.1016/j.ijheatfluidflow.2004.02.018
Publication status	Published - 2004 Jun

Keywords

Bubbly pipe flow
Instantaneous vorticity fluctuation
Turbulence energy budget

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering
Fluid Flow and Transfer Processes

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10.1016/j.ijheatfluidflow.2004.02.018

Cite this

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title = "Effect of bubble diameter on modification of turbulence in an upward pipe flow",

abstract = "The experimental study in vertical upward driven bubbly pipe flow with void fractions of 0.5% and 1.0% is conducted to elucidate the effect of dispersed bubble size on turbulence modification. Liquid phase velocity is measured by particle image velocimetry with fluorescent tracer particles (PIV/LIF). Bubble size and velocity are estimated from the bubble image observed by a projected shadow image technique. Bubbles strongly accumulate near the wall which accelerate the liquid phase. The high concentration of bubbles in the vicinity of the wall induces a reduction of the fluctuation velocity intensity of the liquid. The effect of bubble-induced turbulence on the global pipe flow structure was investigated by the turbulence energy production and dissipation, estimated from the experiment data, and local vortical structure around the bubbles.",

keywords = "Bubbly pipe flow, Instantaneous vorticity fluctuation, Turbulence energy budget",

author = "Akiko Fujiwara and Daijyu Minato and Koichi Hishida",

note = "Funding Information: This research was carried out as part of the research activity at the Center for Smart Control of Turbulence and funded by MEXT. The first author expresses her gratitude to Mr. Tanaka for conducting the experiment, assisting in the data analysis and helpful discussions. ",

year = "2004",

month = jun,

doi = "10.1016/j.ijheatfluidflow.2004.02.018",

language = "English",

volume = "25",

pages = "481--488",

journal = "Heat Fluid Flow",

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publisher = "Elsevier",

number = "3",

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T1 - Effect of bubble diameter on modification of turbulence in an upward pipe flow

AU - Fujiwara, Akiko

AU - Minato, Daijyu

AU - Hishida, Koichi

N1 - Funding Information: This research was carried out as part of the research activity at the Center for Smart Control of Turbulence and funded by MEXT. The first author expresses her gratitude to Mr. Tanaka for conducting the experiment, assisting in the data analysis and helpful discussions.

PY - 2004/6

Y1 - 2004/6

N2 - The experimental study in vertical upward driven bubbly pipe flow with void fractions of 0.5% and 1.0% is conducted to elucidate the effect of dispersed bubble size on turbulence modification. Liquid phase velocity is measured by particle image velocimetry with fluorescent tracer particles (PIV/LIF). Bubble size and velocity are estimated from the bubble image observed by a projected shadow image technique. Bubbles strongly accumulate near the wall which accelerate the liquid phase. The high concentration of bubbles in the vicinity of the wall induces a reduction of the fluctuation velocity intensity of the liquid. The effect of bubble-induced turbulence on the global pipe flow structure was investigated by the turbulence energy production and dissipation, estimated from the experiment data, and local vortical structure around the bubbles.

AB - The experimental study in vertical upward driven bubbly pipe flow with void fractions of 0.5% and 1.0% is conducted to elucidate the effect of dispersed bubble size on turbulence modification. Liquid phase velocity is measured by particle image velocimetry with fluorescent tracer particles (PIV/LIF). Bubble size and velocity are estimated from the bubble image observed by a projected shadow image technique. Bubbles strongly accumulate near the wall which accelerate the liquid phase. The high concentration of bubbles in the vicinity of the wall induces a reduction of the fluctuation velocity intensity of the liquid. The effect of bubble-induced turbulence on the global pipe flow structure was investigated by the turbulence energy production and dissipation, estimated from the experiment data, and local vortical structure around the bubbles.

KW - Bubbly pipe flow

KW - Instantaneous vorticity fluctuation

KW - Turbulence energy budget

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DO - 10.1016/j.ijheatfluidflow.2004.02.018

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SN - 0142-727X

VL - 25

SP - 481

EP - 488

JO - Heat Fluid Flow

JF - Heat Fluid Flow

IS - 3

ER -

Effect of bubble diameter on modification of turbulence in an upward pipe flow

Abstract

Keywords

ASJC Scopus subject areas

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