Theoretical prediction of flow regime transition in bubble columns by the population balance model

被引:135
作者
Wang, TF [1 ]
Wang, JF [1 ]
Jin, Y [1 ]
机构
[1] Tsinghua Univ, Dept Chem Engn, Beijing 100084, Peoples R China
关键词
regime transition; population balance model (PBM); bubble size distribution; coalescence; breakup; bubble column;
D O I
10.1016/j.ces.2005.04.027
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Theoretical prediction of flow regime transition in bubble columns was studied based on the bubble size distribution by the population balance model (PBM). Models for bubble coalescence and breakup due to different mechanisms, including coalescence due to turbulent eddies, coalescence due to different bubble rise velocities, coalescence due to bubble wake entrainment, breakup due to eddy collision and breakup due to large bubble instability, were proposed. Simulation results showed that at relatively low superficial gas velocities, bubble coalescence and breakup were relatively weak and the bubble size was small and had a narrow distribution; with an increase in the superficial gas velocity, large bubbles began to form due to bubble coalescence, resulting in a much wider bubble size distribution. The regime transition was predicted to occur when the volume fraction of small bubbles sharply decreased. The predicted transition superficial gas velocity was about 4cm/s for the air-water system, in accordance with the values obtained from experimental approaches. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:6199 / 6209
页数:11
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