scholarly journals Application of the Two-Fluid Model with Kinetic Theory of Granular Flow in Liquid–Solid Fluidized Beds

2018 ◽  
Author(s):  
Guodong Liu
Keyword(s):  
Kinetic Theory ◽  
Granular Flow ◽  
Fluidized Beds ◽  
Fluid Model ◽  
Two Fluid Model ◽  
Two Fluid

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

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.

scholarly journals Use of α -shapes for the measurement of 3D bubbles in fluidized beds from two-fluid model simulations

2016 ◽  
Vol 288 ◽  
pp. 409-421 ◽  
Author(s):  
Ignacio Julián ◽  
David González ◽  
Javier Herguido ◽  
Miguel Menéndez
Keyword(s):  
Fluidized Beds ◽  
Fluid Model ◽  
Model Simulations ◽  
Two Fluid Model ◽  
Two Fluid

Numerical Simulation of the Gas-Solid Flow in a Mini-Riser Reactor

2011 ◽  
Vol 396-398 ◽  
pp. 356-360
Author(s):  
Qun Shuai ◽  
Gen Lin Niu ◽  
Hui Zhao ◽  
Qiang Li
Keyword(s):  
Numerical Simulation ◽  
Kinetic Theory ◽  
Solid Phase ◽  
Fluid Model ◽  
Two Phase ◽  
Operational Conditions ◽  
Riser Reactor ◽  
Two Fluid Model ◽  
Two Fluid ◽  
As Solid Phase

The implementation of the kinetic theory for granular flows added strength to the two-phase flow model in the mini-riser. This model uses simulating and calculating commercial software of Fluent to simulate the mini-riser with 0.012m ID and 3m height. Euler-Euler two fluid model was adopted in two dimensional numerical simulation, according to kinetic theory，the solid stress was calculated based on granular temperature and granular viscosity obtained through simulation which could be used to describe the collision between particles. Simulation results, such as solid phase fraction and solid phase velocity, under different operational conditions basically agree well with the experimental measurement.

Two-Fluid-Model-Based Full Physics Simulations of Mixing in Noncohesive Wet Fluidized Beds

2019 ◽  
Vol 58 (27) ◽  
pp. 12323-12346 ◽  
Author(s):  
Maryam Askarishahi ◽  
Mohammad-Sadegh Salehi ◽  
Stefan Radl
Keyword(s):  
Fluidized Beds ◽  
Fluid Model ◽  
Model Based ◽  
Two Fluid Model ◽  
Two Fluid
Sign in / Sign up

Export Citation Format

Share Document