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Onset velocity of circulating fluidization and particle residence time distribution: A CFD-DEM study
Han, Qiqi1,2; Yang, Ning2; Zhu, Jiahua3; Liu, Mingyan1
2015-08-01
Source PublicationPARTICUOLOGY
ISSN1674-2001
Volume21Issue:AUGPages:187-195
Abstract

Until now, the onset velocity of circulating fluidization in liquid-solid fluidized beds has been defined by the turning point of the time required to empty a bed of particles as a function of the superficial liquid velocity, and is reported to be only dependent on the liquid and particle properties. This study presents a new approach to calculate the onset velocity using CFD-DEM simulation of the particle residence time distribution (RTD). The onset velocity is identified from the intersection of the fitted lines of the particle mean residence time as a function of superficial liquid velocity. Our results are in reasonable agreement with experimental data. The simulation indicates that the onset velocity is influenced by the density and size of particles and weakly affected by riser height and diameter. A power-law function is proposed to correlate the mean particle residence time with the superficial liquid velocity. The collisional parameters have a minor effect on the mean residence time of particles and the onset velocity, but influence the particle RTD, showing some humps and trailing. The particle RTD is found to be related to the particle trajectories, which may indicate the complex flow structure and underlying mechanisms of the particle RTD. (C) 2015 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

KeywordDiscrete Element Method (Dem) Computational Fluid Dynamics (Cfd) Liquid Solid Circulating Fluidized Bed Particle Residence Time Distribution Onset Velocity
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.partic.2014.10.011
Indexed BySCI
Language英语
WOS KeywordBED ; SIMULATION ; FLOW
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Chemical ; Materials Science, Multidisciplinary
WOS IDWOS:000356980700021
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/19313
Collection多相复杂系统国家重点实验室
Affiliation1.Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
3.Sichuan Univ, Coll Chem Engn, Chengdu 610065, Peoples R China
Recommended Citation
GB/T 7714
Han, Qiqi,Yang, Ning,Zhu, Jiahua,et al. Onset velocity of circulating fluidization and particle residence time distribution: A CFD-DEM study[J]. PARTICUOLOGY,2015,21(AUG):187-195.
APA Han, Qiqi,Yang, Ning,Zhu, Jiahua,&Liu, Mingyan.(2015).Onset velocity of circulating fluidization and particle residence time distribution: A CFD-DEM study.PARTICUOLOGY,21(AUG),187-195.
MLA Han, Qiqi,et al."Onset velocity of circulating fluidization and particle residence time distribution: A CFD-DEM study".PARTICUOLOGY 21.AUG(2015):187-195.
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