Effects of Particle Diameter on Bubble Coalescence in a Slurry Bubble Column

被引:31
|
作者
Ojima, Shimpei [1 ]
Sasaki, Shohei [1 ]
Hayashi, Kosuke [1 ]
Tomiyama, Akio [1 ]
机构
[1] Kobe Univ, Grad Sch Engn, Kobe, Hyogo 6578501, Japan
基金
日本学术振兴会;
关键词
Bubble Coalescence; Multi-Fluid Model; Gas Holdup; Numerical Simulation; FLOW REGIME TRANSITION; GAS HOLDUP; SOLIDS; MODEL; SIZE;
D O I
10.1252/jcej.14we248
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The time, t(C), elapsed from bubble contact to the rupture of the liquid film between two bubbles in a quasi two-dimensional column was measured to investigate the effects of the particle diameter on bubble coalescence. The particle diameter ranged from 60 to 150 mu m and the particle volumetric concentration ranged from 0 to 0.50 (50%). The effects of particle diameter on bubble coalescence were evaluated through the experiments and were implemented into a bubble lcoalescence model for a multi-fluid model. Distributions of the gas holdup in a three-dimensional slurry bubble column were also measured using an electrical conductivity probe to obtain experimental data for validation of the coalescence model. The conclusions obtained are as follows: (1) t(C) decreases, in other words, bubble coalescence is enhanced with decreasing the particle diameter, which results in the reduction of the gas holdup of the slurry bubble column, (2) the particle-effect multiplier to t(C) is of great use to take into account the effects of the particle concentration and diameter in multi-fluid simulations of slurry bubble columns, and (3) the interaction between the bubble interfaces and particles in the bubble coalescence process after bubble contact is a local phenomenon and rarely depends on the macroscopic behavior of the interface, which allows us to develop a correlation for particle-induced enhancement of bubble coalescence for three-dimensional bubble columns even with a small experimental setup like a Hele-Shaw cell.
引用
收藏
页码:181 / 189
页数:9
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