Discrete Element Study of Solid Mixing Behavior with Temperature Difference in Three-Dimensional Bubbling Fluidized Bed

2014 ◽  
Vol 53 (17) ◽  
pp. 7043-7055 ◽  
Author(s):  
Shiliang Yang ◽  
Kun Luo ◽  
Mingming Fang ◽  
Jianren Fan ◽  
Kefa Cen
Keyword(s):  
Fluidized Bed ◽  
Temperature Difference ◽  
Three Dimensional ◽  
Discrete Element ◽  
Mixing Behavior ◽  
Bubbling Fluidized Bed ◽  
Element Study

Three dimensional multi fluid modeling of Geldart B bubbling fluidized bed with complex inlet geometries

2017 ◽  
Vol 312 ◽  
pp. 89-102 ◽  
Author(s):  
Peter Ostermeier ◽  
Annelies Vandersickel ◽  
Stephan Gleis ◽  
Hartmut Spliethoff
Keyword(s):  
Fluidized Bed ◽  
Three Dimensional ◽  
Fluid Modeling ◽  
Bubbling Fluidized Bed

Discrete element study of granulation in a spout-fluidized bed

2007 ◽  
Vol 62 (1-2) ◽  
pp. 195-207 ◽  
Author(s):  
J.M. Link ◽  
W. Godlieb ◽  
N.G. Deen ◽  
J.A.M. Kuipers
Keyword(s):  
Fluidized Bed ◽  
Discrete Element ◽  
Element Study

Observed Mixing Behavior of Single Particles in a Bubbling Fluidized Bed of Higher-Density Particles

2012 ◽  
Vol 51 (44) ◽  
pp. 14566-14576 ◽  
Author(s):  
Jack Halow ◽  
Kerri Holsopple ◽  
Benjamin Crawshaw ◽  
Stuart Daw ◽  
Charles Finney
Keyword(s):  
Fluidized Bed ◽  
Single Particles ◽  
Mixing Behavior ◽  
Bubbling Fluidized Bed

scholarly journals Three-dimensional numerical simulation of upflow bubbling fluidized bed in opaque tube under high flux solar heating

AIChE Journal ◽  
2018 ◽  
Vol 64 (11) ◽  
pp. 3857-3867 ◽  
Author(s):  
Hadrien Benoit ◽  
Renaud Ansart ◽  
Hervé Neau ◽  
Pablo Garcia Triñanes ◽  
Gilles Flamant ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Fluidized Bed ◽  
Three Dimensional ◽  
Solar Heating ◽  
High Flux ◽  
Bubbling Fluidized Bed

scholarly journals A Mixing Behavior Study of Biomass Particles and Sands in Fluidized Bed Based on CFD-DEM Simulation

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1801 ◽  
Author(s):  
Heng Wang ◽  
Zhaoping Zhong
Keyword(s):  
Fluidized Bed ◽  
Three Dimensional ◽  
Vertical Direction ◽  
Gas Velocity ◽  
Three Dimensional Model ◽  
Large Size ◽  
Behavior Study ◽  
Mixing Behavior ◽  
Computational Fluid Dynamics Cfd ◽  
Biomass Particles

The present paper studied the mixing characteristics of biomass and sands in a fluidized bed. A three dimensional model is calculated on the basis of computational fluid dynamics (CFD) and the discrete element method (DEM), while the lab-scale experiments under similar conditions are conducted. To investigate the mixing behavior of biomass and sands, particle distribution, particles time averaged kinetic motion and the Lacey index are analyzed and the effects of gas velocity and biomass size are discussed. Gas velocity provides the basic motion for particle movement and biomass particles gain a lot more kinetic motion than sands due to their large size. The biomass mixing process in a horizontal direction is more sensitive to gas velocity than in a vertical direction. Biomass size could slightly affect the mixing quality and a well mixing in fluidized bed could be reached if the size of biomass to sands is smaller than 4 times.

Particle-scale modeling of biomass gasification in the three-dimensional bubbling fluidized bed

2019 ◽  
Vol 196 ◽  
pp. 1-17 ◽  
Author(s):  
Shiliang Yang ◽  
Hua Wang ◽  
Yonggang Wei ◽  
Jianhang Hu ◽  
Jia Wei Chew
Keyword(s):  
Fluidized Bed ◽  
Three Dimensional ◽  
Biomass Gasification ◽  
Scale Modeling ◽  
Bubbling Fluidized Bed

scholarly journals Particle-Scale Simulation of Solid Mixing Characteristics of Binary Particles in a Bubbling Fluidized Bed

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4442 ◽  
Author(s):  
Junjie Lin ◽  
Kun Luo ◽  
Shuai Wang ◽  
Liyan Sun ◽  
Jianren Fan
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Fluidized Bed ◽  
Critical Velocity ◽  
Superficial Velocity ◽  
Mixing Index ◽  
Mixing Behavior ◽  
Mixing Characteristics ◽  
Bubbling Fluidized Bed

The behavior of solid mixing dynamic is of profound significance to the heat transfer and reaction efficiencies in energy engineering. In the current study, the solid mixing characteristics of binary particles in the bubbling fluidized bed are further revealed at particle-scale. Specifically, the influences of gas superficial velocity, Sauter mean diameter (SMD) in the system and the range distribution of particle sizes on the performance of mixing index are quantitatively explored using a computational fluid dynamics-discrete element method (CFD-DEM) coupling model. The competition between solid segregation and the mixing of binary particles is deeply analyzed. There is a critical superficial velocity that maximizes the mixing index of the binary mixture in the bubbling fluidized bed. Solid mixing performs more aggressive when below the critical velocity, otherwise solid segregation overtakes mixing when above this critical velocity. Moreover, superficial velocity is a major factor affecting the mixing efficiency in the binary bubbling fluidized bed. Additionally, the mixing behavior is enhanced with the decrease of SMD while it is deteriorated in the binary system with a wide range of particle size distribution. Therefore, it is highly recommended to perform a binary particle system with smaller SMD and closer particle size distribution for the purpose of enhancing the mixing behavior. The significant understanding of mixing characteristics is expected to provide valuable references for the design, operation, and scale-up of binary bubbling fluidized bed.

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