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

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)...

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Bibliographic Details
Published in:	International journal of heat and fluid flow Vol. 25; no. 3; pp. 481 - 488
Main Authors:	Fujiwara, Akiko, Minato, Daijyu, Hishida, Koichi
Format:	Journal Article Conference Proceeding
Language:	English
Published:	New York, NY Elsevier Inc 01-06-2004 Elsevier Science
Subjects:	Bubbly pipe flow Exact sciences and technology Fluid dynamics Fundamental areas of phenomenology (including applications) Instantaneous vorticity fluctuation Instrumentation for fluid dynamics Multiphase and particle-laden flows Nonhomogeneous flows Physics Turbulence energy budget Instantaneous vorticity fluctuation Bubbly pipe flow Turbulence energy budget Gas liquid interface Fluorescence spectroscopy Particle size Vertical pipe Upward flow Instrumentation Void fraction Experimental study Two-phase flow Size effect Particle image velocimetry Bubble flow Velocity measurement Turbulence structure
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Summary:	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.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0142-727X 1879-2278
DOI:	10.1016/j.ijheatfluidflow.2004.02.018