Numerical Simulation Of An Intermediate Sized
Bubble Rising In A Vertical Pipe
Author(s)
J. Hua, S. Quan & J. Nossen
Abstract
A Computational Fluid Dynamics (CFD) based front tracking algorithm is
applied to investigate the rising behaviour of a single bubble in a vertical pipe
with a stagnant or flowing viscous liquid. The ratio of the pipe diameter to the
bubble equivalent diameter ( b D D / ) is varied within the range of 1.0∼10.0. The
wall effects on the terminal bubble rising speed (U ) and shape are investigated
under various flow conditions, which are characterised by the parameters
Archimedes number ( Ar ), Bond number ( Bo ), and bulk liquid flow speed ( l U ).
It is found that the terminal bubble rising speed (U ) relates to the bubble rising
speed in an infinite domain ( ∞ U ) and the pipe diameter by the formula
α ) / ( / ) ( D D U U U b ∝ − ∞ ∞ , where αis an exponent relating to the bubble
deformability, and it is found to be in the range of 1.0∼0.7 in this study. In
addition, the effects of flowing liquid on the terminal bubble rising speed and
shape are also investigated for different sized pipes. It is demonstrated that the
bubble rising behaviour is significantly affected by the flowing liquid in the pipe
with a small diameter. Moreover, the detailed flow field around the bubble is
presented to understand the physics of bubble rising behaviour in a vertical pipe
under various flow conditions.
Keywords: bubble rising, wall effect, front tracking method, Taylor bubble.
Keywords
bubble rising, wall effect, front tracking method, Taylor bubble
Related Book
Other papers in this volume
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