CFD study on double- to single-loop flow pattern transition and its influence on macro mixing efficiency in fully baffled tank stirred by a Rushton turbine
文献类型:期刊论文
作者 | Zhu, Quanhong1,2; Xiao, Hang1,2; Chen, Aqiang1,2; Geng, Shujun1,2; Huang, Qingshan1,2,3 |
刊名 | CHINESE JOURNAL OF CHEMICAL ENGINEERING |
出版日期 | 2019-05-01 |
卷号 | 27期号:5页码:993-1000 |
ISSN号 | 1004-9541 |
关键词 | Rushton turbine Flow pattern Transition Simulation Mechanism Mixing |
DOI | 10.1016/j.cjche.2018.10.002 |
英文摘要 | For a fully baffled tank stirred by a Rushton turbine (RT), the flow pattern will change from double- to single-loop as the off bottom dearance (C) of the RTdeaeases from one third of the tank diameter. Such a flow pattern transition as well as its influence on the macro mixing efficiency was investigated via CFD simulation. The transient sliding mesh approach coupled with the standard k-s turbulence model could correctly and efficiently reproduce the reported critical C range where the flow pattern changes. Simulation results indicated that such a critical C range varied hardly with the impeller rotation speed but decreased significantly with increasing impeller diameter. Small RTs are preferable to generating the single-loop flow pattern. A mechanism of the flow pattern transition was further proposed to explain these phenomena. The discharge stream from the RT deviates downwards from the horizontal direction for small C values; if it meets the tank wall first, the double-loop will form; if it hits the tank bottom first, the single-loop will form. With the flow pattern transition, the mixing time decreased by about 35% at the same power input (P), indicating that the single-loop flow pattern was more efficient than the double-loop to enhance the macro mixing in the tank. A comparison was further made between the single-loop RT and pitched blade turbine (PBT, 45 degrees) from macro mixing perspective. The single-loop RT was found to be less efficient than the PBT and usually required 60% more time to achieve the same level of macro mixing at the same P. (C) 2018 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved. |
WOS关键词 | MINIMUM AGITATION SPEED ; IMPELLER CLEARANCE ; SUSPENSION ; TIME ; SIMULATION ; VESSELS ; HOMOGENIZATION |
资助项目 | National Key Research and Development Program of China[2016YFB0301701] ; National Natural Science Foundation of China[91434114] ; National Natural Science Foundation of China[21376254] ; Instrument Developing Project of the CAS[YZ201641] ; "Transformational Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the CAS[XDA21060400] ; CAS Key Technology Talent Program |
WOS研究方向 | Engineering |
语种 | 英语 |
出版者 | CHEMICAL INDUSTRY PRESS |
WOS记录号 | WOS:000472199000002 |
资助机构 | National Key Research and Development Program of China ; National Natural Science Foundation of China ; Instrument Developing Project of the CAS ; "Transformational Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the CAS ; CAS Key Technology Talent Program |
源URL | [http://ir.ipe.ac.cn/handle/122111/29930] |
专题 | 中国科学院过程工程研究所 |
通讯作者 | Huang, Qingshan |
作者单位 | 1.Chinese Acad Sci, Key Lab Biofuels, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao 266101, Shandong, Peoples R China 2.Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China 3.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China |
推荐引用方式 GB/T 7714 | Zhu, Quanhong,Xiao, Hang,Chen, Aqiang,et al. CFD study on double- to single-loop flow pattern transition and its influence on macro mixing efficiency in fully baffled tank stirred by a Rushton turbine[J]. CHINESE JOURNAL OF CHEMICAL ENGINEERING,2019,27(5):993-1000. |
APA | Zhu, Quanhong,Xiao, Hang,Chen, Aqiang,Geng, Shujun,&Huang, Qingshan.(2019).CFD study on double- to single-loop flow pattern transition and its influence on macro mixing efficiency in fully baffled tank stirred by a Rushton turbine.CHINESE JOURNAL OF CHEMICAL ENGINEERING,27(5),993-1000. |
MLA | Zhu, Quanhong,et al."CFD study on double- to single-loop flow pattern transition and its influence on macro mixing efficiency in fully baffled tank stirred by a Rushton turbine".CHINESE JOURNAL OF CHEMICAL ENGINEERING 27.5(2019):993-1000. |
入库方式: OAI收割
来源:过程工程研究所
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