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Title: CFD-DEM study of effect of bed thickness for bubbling fluidized beds

Abstract

The effect of bed thickness in rectangular fluidized beds is investigated through the CFD–DEM simulations of small-scale systems. Numerical results are compared for bubbling fluidized beds of various bed thicknesses with respect to particle packing, bed expansion, bubble behavior, solids velocities, and particle kinetic energy. Good two-dimensional (2D) flow behavior is observed in the bed having a thickness of up to 20 particle diameters. However, a strong three-dimensional (3D) flow behavior is observed in beds with a thickness of 40 particle diameters, indicating the transition from 2D flow to 3D flow within the range of 20–40 particle diameters. Comparison of velocity profiles near the walls and at the center of the bed shows significant impact of the front and back walls on the flow hydrodynamics of pseudo-2D fluidized beds. Hence, for quantitative comparison with experiments in pseudo-2D columns, the effect of walls has to be accounted for in numerical simulations.

Authors:
; ; ;
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research; National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1114762
Report Number(s):
TPR-3818
DOE Contract Number:  
DE-FE0004000
Resource Type:
Journal Article
Journal Name:
Particuology
Additional Journal Information:
Journal Volume: 10; Journal Issue: 5
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Bubbling fluidized bed; CFD; Wall effect; Discrete element method; Pseudo-2D; Flow hydrodynamics

Citation Formats

Tingwen, Li, Gopalakrishnan, Pradeep, Garg, Rahul, and Shahnam, Mehrdad. CFD-DEM study of effect of bed thickness for bubbling fluidized beds. United States: N. p., 2011. Web. doi:10.1016/j.partic.2012.02.006.
Tingwen, Li, Gopalakrishnan, Pradeep, Garg, Rahul, & Shahnam, Mehrdad. CFD-DEM study of effect of bed thickness for bubbling fluidized beds. United States. doi:10.1016/j.partic.2012.02.006.
Tingwen, Li, Gopalakrishnan, Pradeep, Garg, Rahul, and Shahnam, Mehrdad. Sat . "CFD-DEM study of effect of bed thickness for bubbling fluidized beds". United States. doi:10.1016/j.partic.2012.02.006. https://www.osti.gov/servlets/purl/1114762.
@article{osti_1114762,
title = {CFD-DEM study of effect of bed thickness for bubbling fluidized beds},
author = {Tingwen, Li and Gopalakrishnan, Pradeep and Garg, Rahul and Shahnam, Mehrdad},
abstractNote = {The effect of bed thickness in rectangular fluidized beds is investigated through the CFD–DEM simulations of small-scale systems. Numerical results are compared for bubbling fluidized beds of various bed thicknesses with respect to particle packing, bed expansion, bubble behavior, solids velocities, and particle kinetic energy. Good two-dimensional (2D) flow behavior is observed in the bed having a thickness of up to 20 particle diameters. However, a strong three-dimensional (3D) flow behavior is observed in beds with a thickness of 40 particle diameters, indicating the transition from 2D flow to 3D flow within the range of 20–40 particle diameters. Comparison of velocity profiles near the walls and at the center of the bed shows significant impact of the front and back walls on the flow hydrodynamics of pseudo-2D fluidized beds. Hence, for quantitative comparison with experiments in pseudo-2D columns, the effect of walls has to be accounted for in numerical simulations.},
doi = {10.1016/j.partic.2012.02.006},
journal = {Particuology},
number = 5,
volume = 10,
place = {United States},
year = {2011},
month = {10}
}