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题名:
A grid-independent EMMS/bubbling drag model for bubbling and turbulent fluidization
作者: Luo, Hao1,3; Lu, Bona1,2; Zhang, Jingyuan1,2; Wu, Hao3; Wang, Wei1,2
刊名: CHEMICAL ENGINEERING JOURNAL
出版日期: 2017-10-15
卷号: 326, 页码:47-57
关键词: Fluidized bed ; EMMS ; Simulation ; Grid dependence ; Drag coefficient ; CFD
收录类别: SCI
WOS记录号: WOS:000406137200006
DOI: 10.1016/j.cej.2017.04.145
文章类型: Article
英文摘要: 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.
WOS标题词: Science & Technology ; Technology
类目[WOS]: Engineering, Environmental ; Engineering, Chemical
研究领域[WOS]: Engineering
关键词[WOS]: GAS-SOLID FLOW ; FILTERED 2-FLUID MODELS ; CFD SIMULATION ; FCC PARTICLES ; MULTISCALE CFD ; BED REACTORS ; EMMS MODEL ; SUSPENSIONS ; RISER ; COEFFICIENT
项目资助者: National Natural Science Foundation of China(21576263 ; "Strategic Priority Research Program" of Chinese Academy of Sciences(XDA07080202) ; Youth Innovation Promotion Association CAS(2015033) ; 21625605 ; 91334204)
语种: 英语
ISSN号: 1385-8947
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ipe.ac.cn/handle/122111/22985
Appears in Collections:多相复杂系统国家重点实验室_期刊论文

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作者单位: 1.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:
Luo, Hao,Lu, Bona,Zhang, Jingyuan,et al. A grid-independent EMMS/bubbling drag model for bubbling and turbulent fluidization[J]. CHEMICAL ENGINEERING JOURNAL,2017,326:47-57.
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