scholarly journals Validation study on spatially averaged two‐fluid model for gas‐solid flows: II. Application to risers and fluidized beds

AIChE Journal ◽  
2018 ◽  
Vol 64 (5) ◽  
pp. 1606-1617 ◽  
Author(s):  
Simon Schneiderbauer
Keyword(s):  
Validation Study ◽  
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.

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

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

scholarly journals Pattern formation in fluidized beds as a tool for model validation: A two-fluid model based study

2016 ◽  
Vol 295 ◽  
pp. 35-42 ◽  
Author(s):  
Kaiqiao Wu ◽  
Lilian de Martín ◽  
Luca Mazzei ◽  
Marc-Olivier Coppens
Keyword(s):  
Pattern Formation ◽  
Model Validation ◽  
Fluidized Beds ◽  
Fluid Model ◽  
Model Based ◽  
Two Fluid Model ◽  
Two Fluid

Practical validation of the two-fluid model applied to dense gas–solid flows in fluidized beds

2007 ◽  
Vol 62 (21) ◽  
pp. 5854-5869 ◽  
Author(s):  
HÅvard Lindborg ◽  
Magne Lysberg ◽  
Hugo A. Jakobsen
Keyword(s):  
Fluidized Beds ◽  
Fluid Model ◽  
Dense Gas ◽  
Two Fluid Model ◽  
Practical Validation ◽  
Two Fluid
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