| A numerical study of effects of counter-current gas flow rate on local hydrodynamic characteristics of falling films over horizontal tubes | |
| Li, Meijun1,2,3; Lu, Yuan1,2; Zhang, Shijie1,2; Xiao, Yunhan1,2 | |
| 刊名 | Desalination
 |
| 2016-04-01 | |
| 卷号 | 383页码:68-80 |
| 关键词 | Mode transitions Film thickness distribution Falling film Cfd Counter-current gas flow |
| ISSN号 | 0011-9164 |
| DOI | 10.1016/j.desal.2016.01.016 |
| 通讯作者 | Zhang, shijie(zhangsj@mail.etp.ac.cn) |
| 英文摘要 | A three-dimensional computational fluid dynamics (cfd) model based on the vof method is developed to investigate the hydrodynamic characteristics of falling film over horizontal tubes. the model not only considers gravity and surface tension, but also considers drag force when counter-current gas flow is imposed. for different liquid flow rates, laminar model, and k-epsilon turbulence model are employed to improve the model accuracy. simulations are performed for the film re varying from 100 to 1000 and gas flow rate ranging from 0 m/s to 0.5375 m/s. based on the simulations, the gas flow effects on flow mode transitions agree well with the experimental data. in the circumferential direction, all bulk film thicknesses increase with the increased gas flow rate in the three basic flow modes droplet, column, and sheet. in both the droplet and column flow mode, the position in which the thinnest film is located changes when gas flow is imposed. in the axial direction, the maximum film thickness is approximately twice that of the minimum in the droplet flow mode. regular stable-crest-stable distribution can be observed in the column flow mode and the film distribution nearly has no variation in the sheet flow mode over time. (c) 2016 elsevier b.v. all rights reserved. |
| WOS关键词 | HEAT-TRANSFER ; LIQUID-FILMS ; MODE TRANSITIONS ; MASS-TRANSFER ; ABSORPTION ; THICKNESS ; ABSORBER ; EVAPORATION ; DROPLETS ; BANKS |
| WOS研究方向 | Engineering ; Water Resources |
| WOS类目 | Engineering, Chemical ; Water Resources |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCIENCE BV |
| WOS记录号 | WOS:000384634100009 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2375037 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Zhang, Shijie |
| 作者单位 | 1.Chinese Acad Sci, Inst Engn Thermophys, Key Lab Adv Energy & Power, Beijing 100790, Peoples R China 2.Chinese Acad Sci, Res Ctr Clean Energy & Power, Lianyungang 222069, Jiangsu, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Meijun,Lu, Yuan,Zhang, Shijie,et al. A numerical study of effects of counter-current gas flow rate on local hydrodynamic characteristics of falling films over horizontal tubes[J]. Desalination,2016,383:68-80. |
| APA | Li, Meijun,Lu, Yuan,Zhang, Shijie,&Xiao, Yunhan.(2016).A numerical study of effects of counter-current gas flow rate on local hydrodynamic characteristics of falling films over horizontal tubes.Desalination,383,68-80. |
| MLA | Li, Meijun,et al."A numerical study of effects of counter-current gas flow rate on local hydrodynamic characteristics of falling films over horizontal tubes".Desalination 383(2016):68-80. |
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