Eulerian-Lagrangian simulation of bubble coalescence in bubbly flow using the spring-dashpot model

doi:10.1016/j.cjche.2016.08.006

›› 2017, Vol. 25 ›› Issue (3): 249-256.DOI: 10.1016/j.cjche.2016.08.006

• Fluid Dynamics and Transport Phenomena • 下一篇

Eulerian-Lagrangian simulation of bubble coalescence in bubbly flow using the spring-dashpot model

Jing Xue^1,2, Feiguo Chen¹, Ning Yang¹, Wei Ge¹

1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, P. O. Box 353, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2016-04-15 修回日期:2016-08-08 出版日期:2017-03-28 发布日期:2017-04-15
通讯作者: Ning Yang
基金资助:
The authors wish to acknowledge the long term support from the National Natural Science Foundation of China (Grant No. 91434121), Ministry of Science and Technology of China (Grant No. 2013BAC12B01) and State Key Laboratory of Multiphase complex systems (Grant No. MPCS-2015-A-03) and Chinese Academy of Sciences (Grant No. XDA07080301).

Eulerian-Lagrangian simulation of bubble coalescence in bubbly flow using the spring-dashpot model

Jing Xue^1,2, Feiguo Chen¹, Ning Yang¹, Wei Ge¹

1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, P. O. Box 353, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2016-04-15 Revised:2016-08-08 Online:2017-03-28 Published:2017-04-15
Supported by:
The authors wish to acknowledge the long term support from the National Natural Science Foundation of China (Grant No. 91434121), Ministry of Science and Technology of China (Grant No. 2013BAC12B01) and State Key Laboratory of Multiphase complex systems (Grant No. MPCS-2015-A-03) and Chinese Academy of Sciences (Grant No. XDA07080301).

摘要/Abstract

摘要： The Eulerian-Lagrangian simulation of bubbly flow has the advantage of tracking the motion of bubbles in continuous fluid, and hence the position and velocity of each bubble could be accurately acquired. Previous simulation usually used the hard-sphere model for bubble-bubble interactions, assuming that bubbles are rigid spheres and the collisions between bubbles are instantaneous. The bubble contact time during collision processes is not directly taken into account in the collision model. However, the contact time is physically a prerequisite for bubbles to coalesce, and should be long enough for liquid film drainage. In thiswork we applied the spring-dashpot model to model the bubble collisions and the bubble contact time, and then integrated the spring-dashpot model with the film drainage model for coalescence and a bubble breakage model. The bubble contact time is therefore accurately recorded during the collisions. We investigated the performance of the spring-dashpot model and the effect of the normal stiffness coefficient on bubble coalescence in the simulation. The results indicate that the spring-dashpot model together with the bubble coalescence and breakage model could reasonably reproduce the two-phase flow field, bubble coalescence and bubble size distribution. The influence of normal stiffness coefficient on simulation is also discussed.

关键词: Bubble column, Spring-dashpot model, Coalescence, Break-up, Bubble size distribution

Abstract: The Eulerian-Lagrangian simulation of bubbly flow has the advantage of tracking the motion of bubbles in continuous fluid, and hence the position and velocity of each bubble could be accurately acquired. Previous simulation usually used the hard-sphere model for bubble-bubble interactions, assuming that bubbles are rigid spheres and the collisions between bubbles are instantaneous. The bubble contact time during collision processes is not directly taken into account in the collision model. However, the contact time is physically a prerequisite for bubbles to coalesce, and should be long enough for liquid film drainage. In thiswork we applied the spring-dashpot model to model the bubble collisions and the bubble contact time, and then integrated the spring-dashpot model with the film drainage model for coalescence and a bubble breakage model. The bubble contact time is therefore accurately recorded during the collisions. We investigated the performance of the spring-dashpot model and the effect of the normal stiffness coefficient on bubble coalescence in the simulation. The results indicate that the spring-dashpot model together with the bubble coalescence and breakage model could reasonably reproduce the two-phase flow field, bubble coalescence and bubble size distribution. The influence of normal stiffness coefficient on simulation is also discussed.

Key words: Bubble column, Spring-dashpot model, Coalescence, Break-up, Bubble size distribution

Jing Xue, Feiguo Chen, Ning Yang, Wei Ge. Eulerian-Lagrangian simulation of bubble coalescence in bubbly flow using the spring-dashpot model[J]. , 2017, 25(3): 249-256.

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Eulerian-Lagrangian simulation of bubble coalescence in bubbly flow using the spring-dashpot model

Eulerian-Lagrangian simulation of bubble coalescence in bubbly flow using the spring-dashpot model

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