Three-dimensional simulation of dense suspension upflow regime in high-density CFB risers with EMMS-based two-fluid model

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	Three-dimensional simulation of dense suspension upflow regime in high-density CFB risers with EMMS-based two-fluid model
	Zhou, Quan 1,2; Wang, Junwu 1; Li, Jinghai 1
刊名	CHEMICAL ENGINEERING SCIENCE
	2014-04-07
卷号	107 期号:1 页码:206-217
关键词	Meso-scale Stability condition Fluidization Multiphase flow Powder technology Particulate processes
ISSN号	0009-2509
其他题名	Chem. Eng. Sci.
中文摘要	Dense suspension upflow (DSU) regime in high-density circulating fluidized bed (CFB) risers, featuring no downward particle flux and high mean solid holdup, offers significant advantages over conventional fast fluidization, such as much less solid backmixing and higher solid holdup. While most oldie previous CFD simulations are limited to the regime of fast fluidization in low-density CFB risers, it is difficult to reproduce the hydrodynamics of DSU regime using CFD simulation. In this study, a recently proposed EMMS-based two-fluid model (Wang et al., 2012. Chem. Eng. Sci. 75,349-358), where the particle-rich dense phase and gas-rich dilute phase are treated as the two interpenetrating continua instead of treating gas and solid phases as interpenetrating continua as in standard two-fluid models, is first modified and then used to study the hydrodynamics of high-density CFB risers. Extensive simulations haw been performed, and the comparison with experimental data indicated that the EMMS-based two-fluid model had the ability to correctly capture main features of the DSU regime. Therefore, present study not only provided further validation of the idea and feasibility of EMMS-based two-fluid model, but also offered new possibility to explore the hydrodynamic characteristics of DSU regime in high-density CFB risers. (C) 2013 Elsevier Ltd. All rights reserved.
英文摘要	Dense suspension upflow (DSU) regime in high-density circulating fluidized bed (CFB) risers, featuring no downward particle flux and high mean solid holdup, offers significant advantages over conventional fast fluidization, such as much less solid backmixing and higher solid holdup. While most oldie previous CFD simulations are limited to the regime of fast fluidization in low-density CFB risers, it is difficult to reproduce the hydrodynamics of DSU regime using CFD simulation. In this study, a recently proposed EMMS-based two-fluid model (Wang et al., 2012. Chem. Eng. Sci. 75,349-358), where the particle-rich dense phase and gas-rich dilute phase are treated as the two interpenetrating continua instead of treating gas and solid phases as interpenetrating continua as in standard two-fluid models, is first modified and then used to study the hydrodynamics of high-density CFB risers. Extensive simulations haw been performed, and the comparison with experimental data indicated that the EMMS-based two-fluid model had the ability to correctly capture main features of the DSU regime. Therefore, present study not only provided further validation of the idea and feasibility of EMMS-based two-fluid model, but also offered new possibility to explore the hydrodynamic characteristics of DSU regime in high-density CFB risers. (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 ; GROUP-B PARTICLES ; GAS-SOLID FLOWS ; CLUSTER CHARACTERISTICS ; MESOSCALE STRUCTURES ; EULERIAN SIMULATION ; BOUNDARY-CONDITION ; GELDART ; SYSTEMS ; BEHAVIOR
收录类别	SCI
原文出处	://WOS:000330576500018
语种	英语
WOS记录号	WOS:000330576500018
公开日期	2014-05-06
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/8230]
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, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100490, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Quan,Wang, Junwu,Li, Jinghai. Three-dimensional simulation of dense suspension upflow regime in high-density CFB risers with EMMS-based two-fluid model[J]. CHEMICAL ENGINEERING SCIENCE,2014,107(1):206-217.
APA	Zhou, Quan,Wang, Junwu,&Li, Jinghai.(2014).Three-dimensional simulation of dense suspension upflow regime in high-density CFB risers with EMMS-based two-fluid model.CHEMICAL ENGINEERING SCIENCE,107(1),206-217.
MLA	Zhou, Quan,et al."Three-dimensional simulation of dense suspension upflow regime in high-density CFB risers with EMMS-based two-fluid model".CHEMICAL ENGINEERING SCIENCE 107.1(2014):206-217.