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Multi-scale analysis of gas-liquid interaction and CFD simulation of gas-liquid flow in bubble columns
Alternative TitleChem. Eng. Sci.
Yang, N.; Wu, Z. Y.; Chen, J. H.; Wang, Y. H.; Li, J. H.
2011
Conference Name10th International Conference on Gas-Liquid and Gas-Liquid-Solid Reactor Engineering
Source PublicationChemical Engineering Science
Issue14
Pages3212-3222
Conference DateJUN 26-29, 2011
Conference PlaceBraga, PORTUGAL
AbstractThe ratio of effective drag coefficient to bubble diameter is of critical importance for CFD simulation of gas-liquid flow in bubble columns. In this study, a novel model is proposed to calculate the ratio on the basis of the Dual-Bubble-Size (DBS) model. The motivation of the study is that a stability condition reflecting the compromise between different dominant mechanisms can serve for a closure in addition to mass and momentum conservative constraints, and the interphase momentum transfer should be related to different paths of energy dissipation. With the DBS model, we can first offer a physical interpretation on macro-scale regime transition via the shift of global minimum point of micro-scale energy dissipation from one potential trough to the other. Then the proposed drag model is integrated into a CFD simulation. Prior to this integration, we investigate the respective effects of bubble diameter and correction factor and found that the effect of bubble diameter is limited, whereas the correction factor due to the bubble swarm effect is eminent and appropriate correction factor has to be selected for different correlations of standard drag efficient to be in accord with experiments. By contrast, the DBS drag model can well predict the radial gas holdup distribution, the total gas holdup as well as the two-phase flow field without the need to adjust model parameters, showing its great potential and advantage in understanding the complex nature of multi-scale structure of gas-liquid flow in bubble columns. (C) 2011 Elsevier Ltd. All rights reserved.
KeywordBubble Columns Hydrodynamics Multiphase Flow Simulation Cfd Multi-scale Stability Condition Regime Transition Complex-systems Fluidized-bed Model Dynamics Size
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Indexed ByISTP
Language英语
Document Type会议论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/11275
Collection研究所(批量导入)
Recommended Citation
GB/T 7714
Yang, N.,Wu, Z. Y.,Chen, J. H.,et al. Multi-scale analysis of gas-liquid interaction and CFD simulation of gas-liquid flow in bubble columns[C],2011:3212-3222.
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