Progress in Multiphase Flow Research
Online ISSN : 1881-6088
Print ISSN : 1881-5804
ISSN-L : 1881-5804
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Effects of Two-Dimensional-Column Thickness on Single-Bubble Rise Characteristics
Kazuya SHIKATAHideo IWAKIYasushige MORIKatsumi TSUCHIYA
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2009 Volume 4 Pages 117-124

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Abstract

Bubble rise characteristics, including the shape of, rise velocity of, and pressure around a single bubble, are examined using a two-dimensional column. Of particular interest are the effects of column thickness on these rise characteristics. The column thickness tested for simulating—based on the volume-of-fluid (VOF) method—the dynamic variations in the flow around/the boundary of deformable bubbles with area-equivalent bubble diameter of 8-10 mm covers a range from 12 to 3 to 1 mm. Besides reasonable agreements in the said characteristics with those obtained experimentally, it is found that the wake vortices, fate of which have a strong influence on the pressure field, remain almost intact over 2-3 cycles of vortex shedding in the 12-mm thick column, just 1 cycle for 3 mm, and in effect with no formation (as well as shedding) of organized vortical structure in the 1-mm thick column.

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© 2009 by The Japanese Society for Multiphase Flow
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