Numerical study of turbulent bubbly upflow: effect of density ratio
文献类型：期刊论文
| 作者 | Lu M(卢敏)1,2; Yang ZX(杨子轩)1,2; Deng BQ(邓冰清)2 |
| 刊名 | JOURNAL OF FLUID MECHANICS
 |
| 出版日期 | 2025-03-17 |
| 卷号 | 1007页码:24 |
| 关键词 | turbulence simulation gas/liquid flows turbulence theory |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2025.129 |
| 通讯作者 | Yang, Zixuan(yangzx@imech.ac.cn) |
| 英文摘要 | In this study, we conducted interface-capturing high-resolution simulations of a bubbly upflow in a vertical channel to investigate the bubble distribution and its interaction with surrounding turbulence, focusing on the effects of the density ratio. A bulk Reynolds number $Re_b=2300$ was used for all simulations. The influence of density ratio on vortex structures and turbulence statistics differed between the near-wall and core regions of the channel. Adding 5.43 $\%$ gas caused an increase in wall friction. By applying a generalised FIK identity to analyse wall friction, it was determined that the drag rise in the bubbly channel was mostly due to the near-wall region. Visualisation of the bubble and vortex structures showed that small bubbles near the wall induced larger magnitude of Reynolds shear stress and increased wall friction. Bubble behaviour near the wall region was similar for density ratios above 30, leading to wall friction saturation. In the core region, large deformable bubbles created wake vortices due to slip velocity between liquid and gas phases. Wake vortices help large bubbles absorb smaller bubbles and maintain their sizes. As the density ratio increased, the slip velocity increased owing to greater difference in the gravitational acceleration between liquid and gas phases, resulting in corresponding increase in wake intensity and velocity fluctuations. However, quadrant analysis showed that Q1 and Q3 events increased together with Q2 and Q4 events in the core region, cancelling out any net effect of wake vortices on Reynolds shear stress or wall friction. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | SIMULATION ; COALESCENCE ; EFFICIENT ; FLOWS |
| 资助项目 | National Natural Science Foundation of China (NSFC) Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics'[11988102] ; NSFC project[11972038] ; NSFC project[12402260] ; Chinese Academy of Sciences Project for Young Scientists in Basic Research[YSBR- 087] ; China Postdoctoral Science Foundation[2024M753317] |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001445810400001 |
| 资助机构 | National Natural Science Foundation of China (NSFC) Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics' ; NSFC project ; Chinese Academy of Sciences Project for Young Scientists in Basic Research ; China Postdoctoral Science Foundation |
| 其他责任者 | 杨子轩 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/100670]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lu M,Yang ZX,Deng BQ. Numerical study of turbulent bubbly upflow: effect of density ratio[J]. JOURNAL OF FLUID MECHANICS,2025,1007:24. |
| APA | 卢敏,杨子轩,&邓冰清.(2025).Numerical study of turbulent bubbly upflow: effect of density ratio.JOURNAL OF FLUID MECHANICS,1007,24. |
| MLA | 卢敏,et al."Numerical study of turbulent bubbly upflow: effect of density ratio".JOURNAL OF FLUID MECHANICS 1007(2025):24. |
入库方式： OAI收割
来源：力学研究所
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