Linking discrete particle simulation to continuum properties of the gas fluidization of cohesive particles

Discrete particle simulation can explicitly consider interparticle forces and obtain microscopic properties of the fluidized cohesive particles, but it is computationally expensive. It is thus pivotal to link the microscopic discrete properties to the macroscopic continuum description of the system...

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Bibliographic Details
Published in:AIChE journal 2020-05, Vol.66 (5), p.n/a
Main Authors: Wu, Yongli, Hou, Qinfu, Yu, Aibing
Format: Article
Language:English
Subjects:
agglomeration
averaging method
CFD‐DEM
Cohesion
cohesive particle
Computational fluid dynamics
Computer applications
Computer simulation
Discrete element method
Fluid dynamics
Fluidization
Fluidizing
Hydrodynamics
Pressure
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Summary:Discrete particle simulation can explicitly consider interparticle forces and obtain microscopic properties of the fluidized cohesive particles, but it is computationally expensive. It is thus pivotal to link the microscopic discrete properties to the macroscopic continuum description of the system for large scale applications. This work studies the fluidization of cohesive particles through the coupled computational fluid dynamics and discrete element method (CFD‐DEM). First, discrete CFD‐DEM results show the increased particle cohesion leads to the severe particle agglomeration which affects the fluidization quality significantly. Then, continuum properties are attained by a weighted time‐volume averaging method, showing that tensile pressure becomes significant as particle cohesion increases. By incorporating Rumpf correlation into the solid pressure equation, the tensile pressure could be predicted consistently with the averaged CFD‐DEM results for different particle cohesion. Finally, those overall steady averaged properties of the bed are obtained for understanding the general macroscopic properties of the system.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.16944