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A general EMMS drag model applicable for gas-solid turbulent beds and cocurrent downers
Hu, Shanwei; Liu, Xinhua
2019-09-21
Source PublicationCHEMICAL ENGINEERING SCIENCE
ISSN0009-2509
Volume205Pages:14-24
AbstractEulerian-Eulerian models incorporated with the kinetic theory of granular flow were widely used in the simulation of gas-solid two-phase flow, while the effects of mesoscale structures such as particle clusters and gas bubbles could not be considered adequately if traditional homogeneous drag models were adopted in the coarse grid simulations. The energy minimization multiscale (EMMS) model has been proved to facilitate calculating a structure-dependent drag coefficient by considering particle clustering phenomena, which can be coupled with the two-fluid model (TFM) to improve the accuracy of coarse-grid simulation of gas-solid circulating fluidized beds. However, the original EMMS drag model cannot be further applied to the simulation of gas-solid fluidized beds with solids flow rate smaller than zero, e.g., turbulent fluidized beds and cocurrent downward flow, because the original cluster diameter correlation gives rise to a value smaller than single particle diameter or even negative value at extremely low solids fluxes or downward gas-solid flow. In this study, a new proposed cluster evolution equation is proposed by quantifying local clustering dynamics to replace the original cluster diameter correlation. The newly formulated EMMS drag model can be used to avoid a negative cluster diameter to be involved in calculating interphase drag force in the overall fluidization regime. The improved EMMS drag law is incorporated into the Eulerian-Eulerian model to simulate gas-solid turbulent fluidized beds and cocurrent downer reactors, since they both were widely used in many industrial processes. By analyzing local hydrodynamics as well as the axial and radial heterogeneous distributions in the two kinds of fluidized beds, it is clarified that the simulation using the improved EMMS drag model shows a better agreement with the experimental data than the computation using the homogeneous drag law. (C) 2019 Elsevier Ltd. All rights reserved.
KeywordEMMS drag Simulation Mesoscale Cluster Turbulent bed Cocurrent downer
DOI10.1016/j.ces.2019.04.033
Language英语
WOS KeywordFLUIDIZED-BEDS ; NUMERICAL-SIMULATION ; MESOSCALE STRUCTURES ; CFD SIMULATION ; 2-PHASE FLOW ; HYDRODYNAMICS ; RISER ; BEHAVIOR ; HETEROGENEITY ; GELDART
Funding ProjectStrategic Priority Research Program of the Chinese Academy of Sciences[XDA21040400] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA07080400] ; National Natural Science Foundation of China[21376244] ; National Natural Science Foundation of China[91334107]
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationStrategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China
WOS IDWOS:000470303000002
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/29849
Collection中国科学院过程工程研究所
Corresponding AuthorLiu, Xinhua
AffiliationChinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Hu, Shanwei,Liu, Xinhua. A general EMMS drag model applicable for gas-solid turbulent beds and cocurrent downers[J]. CHEMICAL ENGINEERING SCIENCE,2019,205:14-24.
APA Hu, Shanwei,&Liu, Xinhua.(2019).A general EMMS drag model applicable for gas-solid turbulent beds and cocurrent downers.CHEMICAL ENGINEERING SCIENCE,205,14-24.
MLA Hu, Shanwei,et al."A general EMMS drag model applicable for gas-solid turbulent beds and cocurrent downers".CHEMICAL ENGINEERING SCIENCE 205(2019):14-24.
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