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Simulation of the multiphase flow in bubble columns with stability-constrained multi-fluid CFD models
Xiao, Qi1,2; Wang, Jue2,3; Yang, Ning2; Li, Jinghai2
2017-12-01
发表期刊CHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
卷号329期号:DEC页码:88-99
摘要

The simulation of multiphase flow using multi-fluid CFD models is pertinent to the closure models for drag coefficient and bubble diameter, and empirical correlations or adjustable model parameters were inevitably needed. We proposed the stability-constrained multi-fluid models (SCMF) in our previous works based on the Dual-Bubble-Size (DBS) model and Energy-Minimization Multi-Scale (EMMS) concept. It utilized a stability condition to close the two-fluid models through the ratio of drag coefficient to bubble diameter. The stability condition reflects the compromise of two dominant mechanisms relevant to small bubbles or large bubbles. In this study, we further compared the three SCMF models with experiments and other multi-fluid models, i.e., the two-fluid models with Schiller-Naumann drag or Simonnet drag, the three-fluid model with Krishna drag, and the two-fluid model integrated with the population balance model (PBM). The SCMF models can offer better prediction without the need of empirical correlations or adjusting parameters for both the homogeneous and heterogeneous regimes. We further compared SCMF-A (gas and liquid phases), SCMF-B (dense and dilute phases) and SCMF-C (small bubble, large bubble and liquid) models. The three models are different in terms of the phase separation at the level of conservation equations. We found that SCMF-C cannot give further remarkable improvement, suggesting that the phase separation into three fluids at the level of conservation equations is not necessary, and the essential lies in the stability condition in the DBS model which reflects the compromise of two different dominant mechanisms represented by the two bubble classes. This may enhance our understanding on the mechanisms of scale separation in model developments. (C) 2017 Elsevier B.V. All rights reserved.

关键词Multiphase Flow Cfd Bubble Column Stability Condition Mesoscale Multiscale
文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1016/j.cej.2017.06.008
收录类别SCI ; ISTP
语种英语
关键词[WOS]CHURN-TURBULENT REGIME ; EULERIAN SIMULATIONS ; SCALE-UP ; HYDRODYNAMICS ; REACTORS ; TRANSITION ; DYNAMICS ; LIQUID ; VELOCITY ; BREAKUP
WOS研究方向Engineering
WOS类目Engineering, Environmental ; Engineering, Chemical
项目资助者National Natural Science Foundation of China(91434121 ; Natural Science Foundation of Hubei Province(2015CFB521) ; 91634203)
WOS记录号WOS:000410765700010
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/23241
专题多相复杂系统国家重点实验室
作者单位1.Wuhan 2nd Ship Design & Res Inst, Wuhan 430064, Hubei, Peoples R China
2.Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Xiao, Qi,Wang, Jue,Yang, Ning,et al. Simulation of the multiphase flow in bubble columns with stability-constrained multi-fluid CFD models[J]. CHEMICAL ENGINEERING JOURNAL,2017,329(DEC):88-99.
APA Xiao, Qi,Wang, Jue,Yang, Ning,&Li, Jinghai.(2017).Simulation of the multiphase flow in bubble columns with stability-constrained multi-fluid CFD models.CHEMICAL ENGINEERING JOURNAL,329(DEC),88-99.
MLA Xiao, Qi,et al."Simulation of the multiphase flow in bubble columns with stability-constrained multi-fluid CFD models".CHEMICAL ENGINEERING JOURNAL 329.DEC(2017):88-99.
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