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

Akiko Fujiwara, Daijyu Minato, Koichi Hishida

Research output: Contribution to journalArticle

65 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 languageEnglish
Pages (from-to)481-488
Number of pages8
JournalInternational Journal of Heat and Fluid Flow
Volume25
Issue number3
DOIs
Publication statusPublished - 2004 Jun 1

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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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