文献类型：期刊文献

英文题名：Simulating the impacts of internals on gas-liquid hydrodynamics of bubble column

作者：Guo, Xiaofeng[1];Chen, Caixia[1]

机构：[1]East China Univ Sci & Technol, Minist Educ, Key Lab Coal Gasificat & Energy Chem Engn, Shanghai 200237, Peoples R China

年份：2017

卷号：174

起止页码：311

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20173804184580);WOS:【SCI-EXPANDED(收录号:WOS:000413321000027)】；

基金：This work is supported by China's National Science Foundation (NSFC) under grant 21276085.

语种：英文

外文关键词：Vertical internals; Bubble size distribution; TFM-PBM model; Population balance model; Wall lubrication force

摘要：Impacts of vertical internals on gas-liquid hydrodynamic of bubble columns were simulated using an Eulerian two fluid model coupled with a population balance method (TFM-PBM). The interfacial drag force, the shear induced lift force, and the radial wall lubrication force exerted on bubbles were included in the model. The effects of wall boundary conditions were investigated numerically. The numerical results showed the radial wall lubrication force greatly impacts the radial distribution of time-averaged gas holdup, especially in the internals affecting region. When the internals were present, the turbulent dissipation rates increased significantly in the gaps between the internal walls, and more bubbles with smaller bubble size were predicted in the bubble column. Meanwhile, the gas holdup increased with dense internals insertion, especially in r/R equal to 0.6-0.9 region. The internals and the configurations influence the overall liquid circulation. When 31 thin internals are inserted in column at a low superficial gas velocity, large scale liquid circulations are replaced by small local vortex. However, the variations of liquid circulations are different at a high superficial gas velocity, when the large scale liquid circulations are always present in the column regardless of inserting 31 thin internals or 8 thick internals. (C) 2017 Elsevier Ltd. All rights reserved.