CAS OpenIR
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
Zhu, Quanhong1,2; Xiao, Hang1,2; Chen, Aqiang1,2; Geng, Shujun1,2; Huang, Qingshan1,2,3
2019-05-01
Source PublicationCHINESE JOURNAL OF CHEMICAL ENGINEERING
ISSN1004-9541
Volume27Issue:5Pages:993-1000
AbstractFor 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.
KeywordRushton turbine Flow pattern Transition Simulation Mechanism Mixing
DOI10.1016/j.cjche.2018.10.002
Language英语
WOS KeywordMINIMUM AGITATION SPEED ; IMPELLER CLEARANCE ; SUSPENSION ; TIME ; SIMULATION ; VESSELS ; HOMOGENIZATION
Funding ProjectNational 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 Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational 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
WOS IDWOS:000472199000002
PublisherCHEMICAL INDUSTRY PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/29931
Collection中国科学院过程工程研究所
Corresponding AuthorHuang, Qingshan
Affiliation1.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
Recommended Citation
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Zhu, Quanhong]'s Articles
[Xiao, Hang]'s Articles
[Chen, Aqiang]'s Articles
Baidu academic
Similar articles in Baidu academic
[Zhu, Quanhong]'s Articles
[Xiao, Hang]'s Articles
[Chen, Aqiang]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Zhu, Quanhong]'s Articles
[Xiao, Hang]'s Articles
[Chen, Aqiang]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.