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A grid-independent EMMS/bubbling drag model for bubbling and turbulent fluidization
Luo, Hao1,3; Lu, Bona1,2; Zhang, Jingyuan1,2; Wu, Hao3; Wang, Wei1,2
2017-10-15
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume326Issue:OCTPages:47-57
Abstract

The EMMS/bubbling drag model takes the effects of meso-scale structures (i.e. bubbles) into modeling of drag coefficient and thus improves coarse-grid simulation of bubbling and turbulent fluidized beds. However, its dependence on grid size has not been fully investigated. In this article, we adopt a two-step scheme to extend the EMMS/bubbling model to the sub-grid level. Thus the heterogeneity index, H-D, which accounts for the hydrodynamic disparity between homogeneous and heterogeneous fluidization, can be correlated as a function of both local voidage and slip velocity. Simulations over a periodic domain show the new drag model is less sensitive to grid size because of the additional dependence on local slip velocity. When applying the new drag model to simulations of realistic bubbling and turbulent fluidized beds, we find grid-independent results are easier to obtain for high-velocity turbulent fluidized bed cases. The simulation results indicate that the extended EMMS/bubbling drag model is a potential method for coarse-grid simulations of large-scale fluidized beds. (C) 2017 Elsevier B.V. All rights reserved.

KeywordFluidized Bed Emms Simulation Grid Dependence Drag Coefficient Cfd
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.cej.2017.04.145
Indexed BySCI
Language英语
WOS KeywordGAS-SOLID FLOW ; FILTERED 2-FLUID MODELS ; CFD SIMULATION ; FCC PARTICLES ; MULTISCALE CFD ; BED REACTORS ; EMMS MODEL ; SUSPENSIONS ; RISER ; COEFFICIENT
WOS Research AreaEngineering
WOS SubjectEngineering, Environmental ; Engineering, Chemical
Funding OrganizationNational Natural Science Foundation of China(21576263 ; "Strategic Priority Research Program" of Chinese Academy of Sciences(XDA07080202) ; Youth Innovation Promotion Association CAS(2015033) ; 21625605 ; 91334204)
WOS IDWOS:000406137200006
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/22985
Collection多相复杂系统国家重点实验室
Affiliation1.Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sino Danish Coll, Beijing 100049, Peoples R China
3.Tech Univ Denmark, Dept Chem & Biochem Engn, DK-2800 Lyngby, Denmark
Recommended Citation
GB/T 7714
Luo, Hao,Lu, Bona,Zhang, Jingyuan,et al. A grid-independent EMMS/bubbling drag model for bubbling and turbulent fluidization[J]. CHEMICAL ENGINEERING JOURNAL,2017,326(OCT):47-57.
APA Luo, Hao,Lu, Bona,Zhang, Jingyuan,Wu, Hao,&Wang, Wei.(2017).A grid-independent EMMS/bubbling drag model for bubbling and turbulent fluidization.CHEMICAL ENGINEERING JOURNAL,326(OCT),47-57.
MLA Luo, Hao,et al."A grid-independent EMMS/bubbling drag model for bubbling and turbulent fluidization".CHEMICAL ENGINEERING JOURNAL 326.OCT(2017):47-57.
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