Choking and flow regime transitions: Simulation by a multi-scale CFD approach

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	Choking and flow regime transitions: Simulation by a multi-scale CFD approach
	Wang, Wei; Lu, Bona; Li, Jinghai
刊名	CHEMICAL ENGINEERING SCIENCE
	2007-02-01
卷号	62 期号:3 页码:814-819
关键词	choking transition fluidization multi-scale simulation two-phase flow
ISSN号	0009-2509
其他题名	Chem. Eng. Sci.
中文摘要	The so-called "choking" phenomenon in fluidized systems lacks understanding from micro-scale hydrodynamics and hence always causes disputes. To solve this problem, a newly established multi-scale CFD (computational fluid dynamics) approach, which is based on drag correction from the EMMS (energy-minimization multi-scale) model, is used to simulate our experiments about choking and relevant flow-regime transitions. The computed flow-regime diagram is described with the functional relation between the imposed pressure drop and the solids flux at given gas flow rates. A bell-shaped area with an abrupt plateau, within which the solids flux equals the saturation carrying capacity and the dense upflow coexists with the dilute pneumatic transport, marks the choking transition in this diagram. The non-choking transition, however, is characterized by a smooth shift from the dilute flow to the dense flow, without an area for coexistence of flow regimes. The critical point, the summit of the bell-shaped area, demarcates between the choking and the non-choking transitions, near which the fluctuation of solids volume fraction reaches a maximum. In general, this CFD simulation of flow regime transitions suggests a good perspective of the EMMS based multi-scale approach. (c) 2006 Elsevier Ltd. All rights reserved.
英文摘要	The so-called "choking" phenomenon in fluidized systems lacks understanding from micro-scale hydrodynamics and hence always causes disputes. To solve this problem, a newly established multi-scale CFD (computational fluid dynamics) approach, which is based on drag correction from the EMMS (energy-minimization multi-scale) model, is used to simulate our experiments about choking and relevant flow-regime transitions. The computed flow-regime diagram is described with the functional relation between the imposed pressure drop and the solids flux at given gas flow rates. A bell-shaped area with an abrupt plateau, within which the solids flux equals the saturation carrying capacity and the dense upflow coexists with the dilute pneumatic transport, marks the choking transition in this diagram. The non-choking transition, however, is characterized by a smooth shift from the dilute flow to the dense flow, without an area for coexistence of flow regimes. The critical point, the summit of the bell-shaped area, demarcates between the choking and the non-choking transitions, near which the fluctuation of solids volume fraction reaches a maximum. In general, this CFD simulation of flow regime transitions suggests a good perspective of the EMMS based multi-scale approach. (c) 2006 Elsevier Ltd. All rights reserved.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Engineering, Chemical
研究领域[WOS]	Engineering
关键词[WOS]	GAS-SOLID FLOW ; SYSTEMS
收录类别	SCI
原文出处	://WOS:000243714900015
语种	英语
WOS记录号	WOS:000243714900015
公开日期	2013-10-15
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/3460]
专题	过程工程研究所_研究所（批量导入）
作者单位	Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Wang, Wei,Lu, Bona,Li, Jinghai. Choking and flow regime transitions: Simulation by a multi-scale CFD approach[J]. CHEMICAL ENGINEERING SCIENCE,2007,62(3):814-819.
APA	Wang, Wei,Lu, Bona,&Li, Jinghai.(2007).Choking and flow regime transitions: Simulation by a multi-scale CFD approach.CHEMICAL ENGINEERING SCIENCE,62(3),814-819.
MLA	Wang, Wei,et al."Choking and flow regime transitions: Simulation by a multi-scale CFD approach".CHEMICAL ENGINEERING SCIENCE 62.3(2007):814-819.