Two-fluid modelling for cylindrical fluidized beds using kinetic theory for rough spheres

Particuology ◽  
2020 ◽  
Vol 50 ◽  
pp. 25-34
Author(s):  
Lei Yang ◽  
J.T. Padding ◽  
J.A.M. Kuipers
Keyword(s):  
Kinetic Theory ◽  
Fluidized Beds ◽  
Two Fluid

Calculation of Transient Flow in Circulating Fluidized Beds With Straight and Double Abrupt Outlet Configuration: Relation With the Inelasticity of the Particle-Particle Collisions

2001 ◽  
Author(s):  
Juray De Wilde ◽  
Jan Vierendeels ◽  
Geraldine J. Heynderickx ◽  
Erik Dick ◽  
Guy B. Marin
Keyword(s):  
Kinetic Theory ◽  
Gravity Waves ◽  
Granular Flow ◽  
Fluidized Beds ◽  
Transient Flow ◽  
Industrial Scale ◽  
Circulating Fluidized Beds ◽  
Restitution Coefficient ◽  
Particle Collisions ◽  
The Stability

Abstract Gas-solid flow in industrial scale Circulating Fluidized Beds (CFB’s) is calculated in 3D using the Eulerian-Eulerian approach and the Kinetic Theory of Granular Flow (KTGF). Two outlet configurations are used: a straight top outlet and a double abrupt T-outlet. The effect of the value of the restitution coefficient for particle-particle collisions on the stability of the flow is investigated. Oscillations appearing in CFB’s, are shown to be gravity waves.

Numerical Simulation of Effect of Internals on Slugging Fluidization and Analysis of Nonuniformity Index

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Xiaoling Wang ◽  
Liang Yu ◽  
Jun Wang
Keyword(s):  
Experimental Data ◽  
Granular Flow ◽  
Fluidized Beds ◽  
Fluid Model ◽  
Two Fluid Model ◽  
Reasonable Prediction ◽  
Two Fluid ◽  
Radial Nonuniformity ◽  
Flow Nonuniformity

Abstract The Two-Fluid Model (TFM) using the Kinetic Theory of Granular Flow (KTGF) was applied to simulate 3-D dense fluidized beds with different complex internals. The slugging fluidization was found in the simulated results. When the internals were placed into the reactors, the simulated results showed that the slugs were broken up and bubbling fluidization was formed instead of slugging fluidization. The formation, growth, size, and shape of bubbles were validated to ensure a reasonable prediction. Furthermore, the simulated pressure drop was compared with the corresponding experimental data from the dense fluidized beds with different complex internals, and good agreements were observed. Finally, the flow nonuniformity in the dense fluidized beds was evaluated by a developed method. This method extended Radial Nonuniformity Index (RNI) to Face Nonuniformity Index (FNI) and Volume Nonuniformity Index (VNI). From the calculated FNI and VNI, the fluidization quality of the fluidized beds was quantitatively judged as follows: No.3 > No.1> No.2 > No.4 > Without Internal.

Generalized Boltzmann kinetic theory for EMMS-based two-fluid model

2016 ◽  
Vol 156 ◽  
pp. 44-55 ◽  
Author(s):  
Bidan Zhao ◽  
Shuyue Li ◽  
Junwu Wang
Keyword(s):  
Kinetic Theory ◽  
Fluid Model ◽  
Two Fluid Model ◽  
Two Fluid

CLUSTERS IN CIRCULATING FLUIDIZED BEDS: KINETIC THEORY APPROACH

1995 ◽  
Vol 131 (1) ◽  
pp. 53-71 ◽  
Author(s):  
O. IORDACHE ◽  
Y. BLOISE ◽  
J. CHAOUKI ◽  
R. LEGROS
Keyword(s):  
Kinetic Theory ◽  
Fluidized Beds ◽  
Circulating Fluidized Beds ◽  
Theory Approach

scholarly journals Hybrid Two-Fluid DEM Simulation of Gas-Solid Fluidized Beds

2006 ◽  
Author(s):  
Jin Sun ◽  
Francine Battaglia ◽  
S. Subramaniam
Keyword(s):  
Momentum Transfer ◽  
Fluidized Beds ◽  
Structural Information ◽  
Fluid Model ◽  
Fluid Phase ◽  
Transfer Model ◽  
Dem Simulation ◽  
Dem Simulations ◽  
Two Fluid Model ◽  
Two Fluid

Simulations of gas-solid fluidized beds have been carried out using a hybrid simulation method, which couples the discrete element method (DEM) for particle dynamics with the ensemble-averaged two-fluid (TF) equations for the fluid phase. The coupling between the two phases is modeled using an interphase momentum transfer term. The results of the hybrid TF-DEM simulations are compared to experimental data and two-fluid model simulations. It is found that the TF-DEM simulation is capable of predicting general fluidized bed dynamics, i.e., pressure drop across the bed and bed expansion, which are in agreement with experimental measurements and two-fluid model predictions. In addition, the TF-DEM model demonstrates the capability to capture more heterogeneous structural information of the fluidized beds than the two-fluid model alone. The microstructures in fluidized beds are analyzed and the implications to kinetic theory for granular flows are discussed. However, the TF-DEM simulations depend on the form of the interphase momentum transfer model, which can be computed in terms of averaged or instantaneous particle quantities. Various forms of the interphase momentum transfer model are examined, and their suitability to the hybrid TF-DEM simulation approach is evaluated.

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