文献类型：期刊文献

英文题名：CFD simulation of effects of the configuration of gas distributors on gas-liquid flow and mixing in a bubble column

作者：Lia, Guang[2];Yang, Xiaogang[1];Dai, Gance[2]

机构：[1]Glyndwr Univ, Sch Sci & Technol, Wrexham LL11 2AW, Wales;[2]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2009

卷号：64

期号：24

起止页码：5104

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20095012535203);WOS:【SCI-EXPANDED(收录号:WOS:000274341500002)】；

基金：The authors gratefully acknowledge the support provided by the National High-Tech Research and Development Program of China under the contract 2007AA04Z159, Program for Changjiang Scholars and Innovative Research Team in University (IRT0721) and the 111 Project (1308021). Guang Li would also like to acknowledge the support of State Key Laboratory of Chemical Reactors, East China University of Science and Technology for a Doctoral programme scholarship. Xiaogang Yang would especially like to thank the support of Glyndwr University for a Research Fellowship. The assistance of Mr. R. Parry in proofing the manuscript is also appreciated. The authors also would like to thank the reviewers for their expert guidance on revising the manuscript of this paper.

语种：英文

外文关键词：Bubble column; CFD; Gas distributors; Mixing; Bubble size

摘要：Numerical simulations of gas-liquid flow in a cylindrical bubble column of 400 mm in diameter at the superficial gas velocity U-g = 0.10 ms(-1) were conducted to investigate effects of the configuration of gas distributors on hydrodynamic behaviour, gas hold-up and mixing characteristics. Eight different gas distributors were adopted in the simulation. The simulation results clearly show that the configuration of gas distributor have an important impact on liquid velocity and local gas hold-up in the vicinity of the gas distributor. Comparisons of the overall gas holdup and mixing time among different gas distributors have demonstrated that none of the adopted gas distributors was able to produce the highest interfacial area and also yield the shortest mixing time. The CFD modelling results reveal that an increase in the number of gas sparging pipes used in gas distributors is beneficial in improving the gas hold-up but is disadvantageous in reducing bubble size due to a decrease in turbulent kinetic dissipation. It has been demonstrated from the simulations that the appearance of asymmetrical flow patterns in the bubble column and the adoption of smaller gas sparging pipes for gas distributors are effective in improving the mixing characteristics. (C) 2009 Elsevier Ltd. All rights reserved.