Multi-scale analysis of gas-liquid interaction and CFD simulation of gas-liquid flow in bubble columns

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	Multi-scale analysis of gas-liquid interaction and CFD simulation of gas-liquid flow in bubble columns
	Yang, N.; Wu, Z. Y.; Chen, J. H.; Wang, Y. H.; Li, J. H.
	2011
会议名称	10th International Conference on Gas-Liquid and Gas-Liquid-Solid Reactor Engineering
会议日期	JUN 26-29, 2011
会议地点	Braga, PORTUGAL
关键词	Bubble columns Hydrodynamics Multiphase flow Simulation CFD Multi-scale STABILITY CONDITION REGIME TRANSITION COMPLEX-SYSTEMS FLUIDIZED-BED MODEL DYNAMICS SIZE
期号	14
其他题名	Chem. Eng. Sci.
页码	3212-3222
中文摘要	The 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.
收录类别	ISTP
会议网址	://WOS:000291475000015
会议录	Chemical Engineering Science
语种	英语
内容类型	会议论文
源URL	[http://ir.ipe.ac.cn/handle/122111/11275]
专题	过程工程研究所_研究所（批量导入）
推荐引用方式 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]. 见:10th International Conference on Gas-Liquid and Gas-Liquid-Solid Reactor Engineering. Braga, PORTUGAL. JUN 26-29, 2011.://WOS:000291475000015.