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 | |
会议录 | Chemical Engineering Science
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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. |
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