DEM Simulation of the Particle Mixing in Spouted Bed of Three Solids Differing in Diameter

In this work, the mixing characteristic of ternary diameter particle system in a rectangular spouted bed was carried out three-dimensional discrete element method (DEM). In particular, the standard k- two-equation model and the Beer & Johnson equation were adopted to investigate the influence of turbulence and rolling friction, and Ashton mixing index was adopted to evaluate the dynamic mixing process of the ternary diameter particle systems. The particle velocity profiles, the gas-solid flow patterns, the particles distribution and the effect of gas velocity on mixing are discussed.

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CFD-DEM Simulation of Spouted Bed Dynamics under High Temperature with an Adhesive Model

Energies ◽

10.3390/en14082276 ◽

2021 ◽

Vol 14 (8) ◽

pp. 2276

Author(s):

Zhao Chen ◽

Lin Jiang ◽

Mofan Qiu ◽

Meng Chen ◽

Rongzheng Liu ◽

...

Keyword(s):

High Temperature ◽

Particle Surface ◽

Particle Collision ◽

Gas Velocity ◽

Spouted Bed ◽

Dem Simulation ◽

Linear Spring ◽

Adhesion Model ◽

Adhesive Model ◽

Damping Model

Particle adhesion is of great importance to coating processes due to its effect on fluidization. Currently, Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) has become a powerful tool for the study of multiphase flows. Various contact force models have also been proposed. However, particle dynamics in high temperature will be changed with particle surface properties changing. In view of this, an adhesion model is developed based on approaching-loading-unloading-detaching idea and particle surface change under high temperature in this paper. Analyses of the adhesion model are given through two particle collision process and validated by experiment. Effects of inlet gas velocity and adhesion intensity on spouted bed dynamics are investigated. It is concluded that fluidization cycle will be accelerated by adhesion, and intensity of fluidization will be marginally enhanced by slight adhesion. Within a certain range, increasing inlet gas velocity will lead to strong intensity of particle motion. A parameter sensitivity comparison of linear spring-damping model and Hertz-Mindlin Model is given, which shows in case of small overlaps, forces calculated by both models have little distinction, diametrically opposed to that of large overlaps.

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DEM simulation on particle mixing in dry and wet particles spouted bed

Powder Technology ◽

10.1016/j.powtec.2011.02.025 ◽

2011 ◽

Vol 210 (1) ◽

pp. 73-81 ◽

Cited By ~ 37

Author(s):

R.R. Zhu ◽

W.B. Zhu ◽

L.C. Xing ◽

Q.Q. Sun

Keyword(s):

Spouted Bed ◽

Dem Simulation ◽

Particle Mixing ◽

Wet Particles

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Influence of binary and ternary particle systems on the spouting stability in a three-dimensional prismatic spouted bed

Powder Technology ◽

10.1016/j.powtec.2019.08.065 ◽

2019 ◽

Vol 357 ◽

pp. 305-312

Author(s):

S. Pietsch ◽

P. Kieckhefen ◽

M. Müller ◽

M. Schönherr ◽

F. Kleine Jäger ◽

...

Keyword(s):

Three Dimensional ◽

Particle Systems ◽

Spouted Bed

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Comparisons of laboratory scale measurements of three-dimensional acoustic propagation with solutions by a parabolic equation model

The Journal of the Acoustical Society of America ◽

10.1121/1.4770252 ◽

2013 ◽

Vol 133 (1) ◽

pp. 108-118 ◽

Cited By ~ 17

Author(s):

Frédéric Sturm ◽

Alexios Korakas

Keyword(s):

Parabolic Equation ◽

Three Dimensional ◽

Acoustic Propagation ◽

Equation Model ◽

Laboratory Scale

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3D Numerical Simulation of Polydisperse Pressurized Gas-Solid Fluidized Bed

ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D ◽

10.1115/ajk2011-12016 ◽

2011 ◽

Cited By ~ 3

Author(s):

P. Fede ◽

O. Simonin ◽

I. Ghouila

Keyword(s):

Numerical Simulation ◽

Fluidized Bed ◽

Ethylene Polymerization ◽

Solid Phase ◽

Three Dimensional ◽

Gas Velocity ◽

Particle Segregation ◽

3D Numerical Simulation ◽

Model Predictions ◽

The Mean

Three dimensional unsteady numerical simulations of dense pressurized polydisperse fluidized bed have been carried out. The geometry is a medium-scale industrial pilot for ethylene polymerization. The numerical simulation have been performed with a polydisperse collision model. The consistency of the polydisperse model predictions with the monodisperse ones is shown. The results show that the pressure distribution and the mean vertical gas velocity are not modified by polydispersion of the solid phase. In contrast, the solid particle species are not identically distributed in the fluidized bed indicating the presence of particle segregation.

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CFD Analysis of a Water Vaporization Process in a Three-Dimensional Spouted Bed for Flue Gas Desulfurization

ACS Omega ◽

10.1021/acsomega.0c05056 ◽

2021 ◽

Vol 6 (4) ◽

pp. 2759-2766

Author(s):

Jiali Du ◽

Zhiquan Hui ◽

Feng Wu ◽

Yuan Yan ◽

Kai Yue ◽

...

Keyword(s):

Flue Gas ◽

Three Dimensional ◽

Flue Gas Desulfurization ◽

Cfd Analysis ◽

Spouted Bed ◽

Vaporization Process ◽

Water Vaporization

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DEM simulation of particle mixing in a sheared granular flow

Particuology ◽

10.1016/j.partic.2008.07.006 ◽

2008 ◽

Vol 6 (6) ◽

pp. 445-454 ◽

Cited By ~ 29

Author(s):

Li-Shin Lu ◽

Shu-San Hsiau

Keyword(s):

Granular Flow ◽

Dem Simulation ◽

Particle Mixing

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Numerical Simulation of Start-Up Jets in a Mixing Chamber

ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C ◽

10.1115/fedsm-icnmm2010-30521 ◽

2010 ◽

Author(s):

Chenzhou Lian ◽

Dmytro M. Voytovych ◽

Guoping Xia ◽

Charles L. Merkle

Keyword(s):

Transient Flow ◽

Three Dimensional ◽

Cost Effective ◽

Grid Refinement ◽

Mixing Process ◽

Quantitative Estimates ◽

Start Up ◽

Mixing Chamber ◽

Parametric Analyses ◽

Transient Mixing

Numerical simulations of a transient flow of helium injected into an established background flow of nitrogen were carried out to identify the dominant features of the transient mixing process between these two dissimilar gases. The geometry of interest is composed of two helium slots on either side of a central nitrogen channel feeding into a ‘two-dimensional’ mixing chamber. Simulations were accomplished on both two- and three-dimensional grids using an unsteady DES approach. Results are compared with experimental measurements of species distributions. Unsteady 2-D solutions give a reasonable qualitative picture of the transient mixing process in the middle of the chamber and enable cost-effective parametric analyses and grid refinement studies. The 2-D solutions also provide quantitative estimates of representative characteristic times to guide the 3-D calculations. The 3-D solutions give a reasonable approximation to span-wise events.

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