文献类型：期刊文献

英文题名：Effects of gas distributor on hydrodynamics in gas-liquid bubble column by visual experiments and CFD simulations

作者：Yao, Zhipeng[1];Chen, Caixia[1];Wang, Teng[1];Xia, Zihong[1];Zhao, Luhaibo[2];Tang, Zhiyong[2];Yan, Shuai[3]

机构：[1]East China Univ Sci & Technol, Dept Energy & Chem Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Adv Res Inst SARI, Shanghai 201210, Peoples R China;[3]Ningbo Univ Technol, Sch Mat & Chem Engn, Ningbo 315211, Peoples R China

年份：2025

卷号：504

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20245217567050);WOS:【SCI-EXPANDED(收录号:WOS:001394260100001)】；

基金：The authors would like to acknowledge the financial support to the research provided by the National Natural Science Foundation of China (Grant No. 22278418) and the "Low-carbon transformation technologies and demonstrations in chemical engineering and metallurgical processing", Strategic Priority Research Program of the Chinese Academy of Sciences, Grant No. XDA0390501.

语种：英文

外文关键词：Bubble column; Gas distributor; Flow regime transition; Bubble size distribution; Computational fluid dynamics

摘要：Visual experiments and simulations are conducted to study the effects of varying the size and arrangement of apertures in gas distributors on gas-liquid flow in bubble columns. Flow characteristics, such as bubble size distribution and flow pattern, are investigated using swarm velocity and drift flux methods, which show that the global gas holdup and the flow regime transition point are primarily determined by the opening size of orifices rather than their spatial arrangement. With the aid of high-speed photography and the dynamic gas disengagement method, two mechanisms for flow regime transition are identified, namely "coalescence-induced transition" and the "distributor-induced transition". In addition, a modified two-fluid model-population balance model (TFM-PBM) framework relating gas distributor shape and initial bubble size is established and validated using experimental data. Simulations indicate that a gas distributor with a central aeration mode leads to improved mixing owing to high rising velocity and shear rate, which may benefit mass transfer-limited reactions. In contrast, a distributor with a peripheral aeration mode results in a lower shear effect, which may be applicable to cell growth processes.