文献类型：期刊文献

英文题名：Numerical simulations of fluid dynamics and mixing in a large shallow bubble column: effects of the sparging pipe allocations for multiple-pipe gas distributors

作者：Li, Guang[1];Cai, Qingbai[1];Dai, Gance[1];Yang, Xiaogang[2]

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

年份：2009

卷号：1

期号：2-3

起止页码：165

外文期刊名：INTERNATIONAL JOURNAL OF ENGINEERING SYSTEMS MODELLING AND SIMULATION

收录：WOS:【ESCI(收录号:WOS:000219491800009)】；

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 (B08021). 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 from Glyndwr University where he was awarded a Research Fellowship. The assistance of Mr. R. Parry in proofing the manuscript is also appreciated.

语种：英文

外文关键词：CFD modelling; multiphase flow; multiple-pipe gas distributor; shallow bubble column; two-fluid model; turbulence modelling.

摘要：Numerical simulations of gas-liquid flow in a bubble column of 800 mm in diameter using two-fluid model and multi-size-group (MUSIG) model were conducted to investigate the effect of allocation of sparging pipes in gas distributors on hydrodynamic flow, gas hold-up, mixing characteristics, turbulence and bubble size. In the simulation, six different arrangements were assessed, which four-sparging pipes are mounted to a gas distributor with the allocation ring to bubble column ratios (d/D-T) being 0.3, 0.37, 0.4, 0.5, 0.6 and 0.7, respectively. The simulation results have clearly demonstrated that the allocation of sparging pipes to the gas distributor has an important impact on gas hold-up and mixing characteristics. It was found from the simulations that the mixing time and overall gas hold-up increase initially with the increase of d/D-T but decrease with further increase of d/D-T. As a result, it was revealed that the optimum value of d/D-T is around 0.4 for the highest overall gas hold-up and is confirmed by the experiment. It was also indicated from the simulation that d/D-T of 0.5 yields the maximum mixing time.