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Coarse grid simulation of heterogeneous gas-solid flow in a CFB riser with polydisperse particles
Chen, Xizhong1,2; Wang, Junwu1; Li, Jinghai1
2013-12-01
Source PublicationCHEMICAL ENGINEERING JOURNAL
Volume234Issue:0Pages:173-183
AbstractIndustrial fluidized beds usually show a wide particle size distribution which significantly affects the performance of gas-solid two-phase reactors. However, in traditional CFD models the particle size distribution is often represented by the Sauter mean diameter no matter whether the distribution is wide or narrow, which cannot reflect the effects of the particle size distribution on its operation. In this study, a simplified population balance model (PBM) is combined with two-fluid model (TFM) and the Energy Minimization Multi-Scale (EMMS) drag model for simulating heterogeneous gas-solid flow. The EMMS drag model is used to characterize the effects of meso-scale clustering structures on the inter-phase drag force. The current model is compared with the model with the assumption of single particle diameter, and is used to study the segregation and mixing characteristics in a riser. It was shown that (i) for the specific cases we studied, particle polydispersity has a negligible effect on the time-averaged axial solid concentration profiles but has a notable effect on the particle velocity distributions, (ii) the experimental hydrodynamics as well as segregation and mixing patterns in a riser with a continuous particle size distribution can be predicted reasonably well by present combined TFM-EMMS-PBM method. (C) 2013 Elsevier B.V. All rights reserved.
KeywordMultiphase Flow Population Balance Model Fluidization Meso-scale Structure Emms Drag Model Particle Polydispersity
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
Language英语
WOS KeywordDIRECT QUADRATURE METHOD ; CIRCULATING FLUIDIZED-BEDS ; POPULATION BALANCE ; SIZE DISTRIBUTION ; KINETIC-THEORY ; TURBULENT FLUIDIZATION ; EULERIAN SIMULATION ; MULTIPHASE FLOW ; BUBBLE-COLUMNS ; FCC PARTICLES
WOS Research AreaEngineering
WOS SubjectEngineering, Environmental ; Engineering, Chemical
WOS IDWOS:000328588300022
Citation statistics
Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/13758
Collection研究所(批量导入)
Affiliation1.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
Recommended Citation
GB/T 7714
Chen, Xizhong,Wang, Junwu,Li, Jinghai. Coarse grid simulation of heterogeneous gas-solid flow in a CFB riser with polydisperse particles[J]. CHEMICAL ENGINEERING JOURNAL,2013,234(0):173-183.
APA Chen, Xizhong,Wang, Junwu,&Li, Jinghai.(2013).Coarse grid simulation of heterogeneous gas-solid flow in a CFB riser with polydisperse particles.CHEMICAL ENGINEERING JOURNAL,234(0),173-183.
MLA Chen, Xizhong,et al."Coarse grid simulation of heterogeneous gas-solid flow in a CFB riser with polydisperse particles".CHEMICAL ENGINEERING JOURNAL 234.0(2013):173-183.
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