Evaluation of drag models for cocurrent and countercurrent gas-solid flows

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	Evaluation of drag models for cocurrent and countercurrent gas-solid flows
	Ullah, Atta 1,2; Wang, Wei 1; Li, Jinghai 1
刊名	CHEMICAL ENGINEERING SCIENCE
	2013-04-05
卷号	92 期号:0 页码:89-104
关键词	Chemical reactors Fluidization Mathematical modelling Multiphase flow Meso-scale Simulation
英文摘要	Gas-solid systems, whether cocurrent or countercurrent, manifest meso-scale heterogeneity to some extent. However, most of the previous modelling efforts, including the study of the effects of meso-scale structures as well as relevant drag closures, are mainly focused on cocurrent up riser flows, leaving cocurrent down and countercurrent systems less explored. In this work, by extending drift flux analysis and experimental validation for cocurrent down and countercurrent flow systems, we show that the most commonly used homogeneous drag models may be successful in a certain range of operating conditions, especially with fine-grid resolution. Fine-grid resolution is indeed helpful for reliable simulation of coexisting states, by predicting concave slip velocity curves. By comparison, the energy minimization multiscale (EMMS) drag model allows the use of much coarser grid resolution and better prediction over wider range of operating conditions. Its predictability of the overall slip velocity as well as the drift flux is nearly grid independent over the entire range of voidage. This fact leads us to the obvious advantage of saving computational time. (C) 2013 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]	CIRCULATING FLUIDIZED-BED ; MULTISCALE CFD APPROACH ; FULLY-DEVELOPED REGION ; PARTICLE FLOW ; NUMERICAL-SIMULATION ; RISER REACTORS ; DOWNER REACTOR ; KINETIC-THEORY ; 2-FLUID MODEL ; EMMS APPROACH
收录类别	SCI
语种	英语
WOS记录号	WOS:000316670400007
公开日期	2015-05-27
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/13379]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.Chinese Acad Sci, Inst Proc Engn, EMMS Grp, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Ullah, Atta,Wang, Wei,Li, Jinghai. Evaluation of drag models for cocurrent and countercurrent gas-solid flows[J]. CHEMICAL ENGINEERING SCIENCE,2013,92(0):89-104.
APA	Ullah, Atta,Wang, Wei,&Li, Jinghai.(2013).Evaluation of drag models for cocurrent and countercurrent gas-solid flows.CHEMICAL ENGINEERING SCIENCE,92(0),89-104.
MLA	Ullah, Atta,et al."Evaluation of drag models for cocurrent and countercurrent gas-solid flows".CHEMICAL ENGINEERING SCIENCE 92.0(2013):89-104.