JAPANESE JOURNAL OF MULTIPHASE FLOW
Online ISSN : 1881-5790
Print ISSN : 0914-2843
ISSN-L : 0914-2843
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Effect of Pipe Diameter on the Flow Field around Single Large Bubble Rising in Stagnant Water in a Vertical Pipe
Hisato MINAGAWASatoshi YAMADATakahiro YASUDAYoichi SHIOMI
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JOURNAL FREE ACCESS

2008 Volume 22 Issue 2 Pages 154-160

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Abstract

The measuring method of the averaged liquid velocity fields around a large bubble rising in stagnant liquid in a vertical round pipe using Ultrasonic Velocity Profile monitor (UVP), which the authors have developed in the previous report, was applied to make clear the effect of pipe inner diameter, D, on the velocity field in this report. Two ultrasonic transducers inclined +20 degrees and -20 degrees from the horizontal line, respectively, were used for the measurement to get two dimensional velocity vectors. Three pipes of D = 32, 42 and 54mm were used in the measurement. According to the measured results, the velocity fields in the liquid phase above the large bubble, in the liquid film around the large bubble, and in the wake were presented and discussed, focusing especially on the effect of pipe inner diameter D.

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© 2008 by The Japanese Society for Multiphase Flow
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