Simulation study of microbubbles' break-up and coalescence in centrifugal pump based on TFM-PBM coupling model

被引：0
|
作者：
Gao S. [1 ,2 ]
Xu Y. [1 ,2 ,3 ]
Li J. [1 ,2 ]
Ye S. [1 ,2 ]
Huang W. [1 ,2 ,3 ]
机构：
[1] Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai
[2] University of Chinese Academy of Sciences, Beijing
[3] School of Physical Science and Technology, Shanghai Tech University, Shanghai
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 10期
关键词：
Centrifugal pump; Gas holdup; Gas-liquid flow; Microbubble; Size distribution; TFM-PBM coupling model;
D O I：
10.11949/0438-1157.20210355
中图分类号：
学科分类号：
摘要：
Understanding the generation characteristics of microbubbles in centrifugal pumps is essential for optimizing the performance of existing microbubble generation devices based on rotating equipment and improving the pollutant removal rate of industrial wastewater and waste gas. Recognizing bubble break-up and coalescence, this paper examines how microbubbles evolve under different inlet gas volume fraction (IGVF) and different inlet bubble size in two-phase rotating flow field by coupling two fluid model (TFM) and population balance model (PBM), which was verified to be effective through comparing with experimental head and average bubble size. The results show that gas accumulation in impeller to be the main factor affecting the performance of bubbles with IGVF increasing, which causes bubble size increase as break-up dominated turn to coalescence dominated in impeller. Furthermore, the influence of inlet bubble size on outlet bubble size is sensitive to IGVF. Outlet bubble size increases first and then decreases with inlet bubble size increasing at low IGVF, while this influence is not obvious at high IGVF by gas accumulation in impeller. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：5082 / 5093
页数：11
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