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CFD modeling the hydrodynamics of binary particle mixture in pseudo-2D bubbling fluidized bed: Effect of model parameters
Geng, Shujun1,2; Jia, Zhengrui3; Zhan, Jinhui1; Liu, Xiaoxing1; Xu, Guangwen1
2016-11-01
Source PublicationPOWDER TECHNOLOGY
ISSN0032-5910
Volume302Issue:NOVPages:384-395
Abstract

The hydrodynamics of binary coal-sand mixture in a pseudo-2D rectangular bubbling fluidized bed (0.385 m x 0.005 m x 0.128 m) was simulated using the multi-fluid Eulerian model incorporating the kinetic theory of granular flow. Parametric studies of the boundary wall condition, particle-particle restitution coefficient, friction packing limit, as well as transport equation for granular temperature were performed to investigate their influences on the predicted mixing/segregation behavior. The CFD simulation results demonstrated that the predicted mixing behavior was closely related to the expression for granular temperature transport equation and specularity coefficient. When the full transport equation for granular temperature was adopted, the predicted mixing degree decreased with the increase of specularity coefficient. And the best agreement between simulation results and experimental data was achieved when specularity coefficient was equal to 1.0. Nevertheless, when the algebraic transport equation for granular temperature was adopted, the system was always predicted in well-mixing rather than segregation state. Under the full transport equation for granular temperature and the no slip boundary wall condition, the predicted mixing degree decreased with the increase of the particle-particle restitution coefficient and frictional packing limit. The supplementary simulations indicated that for the considered gas-solid system there exist a critical bed thickness larger than which the system was in well-mixing state and the simulation results were independent from the investigated parameters. The hydrodynamic analysis indicated that the reduction of bubble size and the solid axial movement could be the mechanism responsible for the occurrence of axial segregation. (C) 2016 Elsevier B.V. All rights reserved.

KeywordBubbling Fluidized Bed Mixing Restitution Coefficient Solid Shear Viscosity Boundary Wall Conditions Cfd
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.powtec.2016.09.001
Indexed BySCI
Language英语
WOS KeywordKINETIC-THEORY APPROACH ; SEGREGATION BEHAVIOR ; SPHERICAL-PARTICLES ; GRANULAR FLOW ; COEFFICIENT ; SIMULATION ; RESTITUTION ; DRAG ; MIXING/SEGREGATION ; VERIFICATION
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Natural Science Foundation of China(21576265) ; "Hundred Talents Program" of Chinese Academy of Sciences
WOS IDWOS:000386420500038
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/21579
Collection多相复杂系统国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
Recommended Citation
GB/T 7714
Geng, Shujun,Jia, Zhengrui,Zhan, Jinhui,et al. CFD modeling the hydrodynamics of binary particle mixture in pseudo-2D bubbling fluidized bed: Effect of model parameters[J]. POWDER TECHNOLOGY,2016,302(NOV):384-395.
APA Geng, Shujun,Jia, Zhengrui,Zhan, Jinhui,Liu, Xiaoxing,&Xu, Guangwen.(2016).CFD modeling the hydrodynamics of binary particle mixture in pseudo-2D bubbling fluidized bed: Effect of model parameters.POWDER TECHNOLOGY,302(NOV),384-395.
MLA Geng, Shujun,et al."CFD modeling the hydrodynamics of binary particle mixture in pseudo-2D bubbling fluidized bed: Effect of model parameters".POWDER TECHNOLOGY 302.NOV(2016):384-395.
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