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An EMMS drag model for coarse grid simulation of polydisperse gas-solid flow in circulating fluidized bed risers
Qin, Zhiyuan1,2; Zhou, Quan1; Wang, Junwu1,2
2019-11-02
Source PublicationCHEMICAL ENGINEERING SCIENCE
ISSN0009-2509
Volume207Pages:358-378
Abstract

Polydisperse gas-solid systems are more common in both industry and the natural world than their monodisperse counterparts. This paper aims to investigate the hydrodynamics of polydisperse gas-solid flow systems by extending the energy minimization multiscale (EMMS) drag model. The continuous particle size is discretized into several characteristic sizes, by which the polydisperse particles are classified into several discrete groups. A polydisperse EMMS drag model is then developed by treating these particle groups as solid phases. Finally, the proposed drag model is coupled with the multifluid model to simulate the hydrodynamics of polydisperse gas-solid flow in CFB risers. Extensive simulations are conducted to validate the effectiveness of the polydisperse EMMS drag model and investigate the effects of gas-particle drag models, kinetic theories, and particle-particle drag models on the simulation results. It was found that (i) the polydisperse EMMS drag model can predict the concentration and particle size distribution of polydisperse gas-solid flows better than the traditional drag model; (ii) the particle-particle drag force has an important influence on the mixing and segregation of different particles whereas the particulate phase stress has only a very minor effect, especially when the superficial gas velocity is low. The second finding highlights the need for a suitable particle-particle drag model that considers the effects of mesoscale structures, which will be the topic of our future study. (C) 2019 Elsevier Ltd. All rights reserved.

KeywordFluidization Clustering Structure Emms Drag Model Meso Scale Structure Particle Size Distribution
DOI10.1016/j.ces.2019.06.037
Language英语
WOS KeywordGroup-b Particles ; Lattice-boltzmann Simulations ; Cluster Characteristics ; Mesoscale Structures ; Eulerian Simulation ; Bidisperse Arrays ; Size Distribution ; Binary-mixtures ; 2-fluid Model ; Cfb Risers
Funding ProjectInnovation Academy for Green Manufacture, Chinese Academy of Sciences[IAGM-2019-A13] ; National Natural Science Foundation of China[91834303] ; National Natural Science Foundation of China[91334106] ; Key Research Program of Frontier Science, Chinese Academy of Sciences[QYZDJ-SSW-JSC029]
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationInnovation Academy for Green Manufacture, Chinese Academy of Sciences ; National Natural Science Foundation of China ; Key Research Program of Frontier Science, Chinese Academy of Sciences
WOS IDWOS:000481644300029
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/30547
Collection中国科学院过程工程研究所
Corresponding AuthorWang, Junwu
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Qin, Zhiyuan,Zhou, Quan,Wang, Junwu. An EMMS drag model for coarse grid simulation of polydisperse gas-solid flow in circulating fluidized bed risers[J]. CHEMICAL ENGINEERING SCIENCE,2019,207:358-378.
APA Qin, Zhiyuan,Zhou, Quan,&Wang, Junwu.(2019).An EMMS drag model for coarse grid simulation of polydisperse gas-solid flow in circulating fluidized bed risers.CHEMICAL ENGINEERING SCIENCE,207,358-378.
MLA Qin, Zhiyuan,et al."An EMMS drag model for coarse grid simulation of polydisperse gas-solid flow in circulating fluidized bed risers".CHEMICAL ENGINEERING SCIENCE 207(2019):358-378.
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