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A network model and numerical simulations of flow distributions in packed bed reactors with different packing structures

Wang, Jingyu LU ; Yang, Jian LU ; Sundén, Bengt LU and Wang, Qiuwang (2020) In Applied Thermal Engineering 172.
Abstract

Due to the high specific surface area, packed bed reactors are widely used in real engineering applications. The flow distribution, which is highly dependent on the packing structure, can be vital for the heat/mass transfer and reaction performances. This makes the study of the flow distribution in packed beds quite important. In the present paper, an equivalent network model based on the Voronoi tessellation is proposed to predict the flow field. In addition, a relationship between the hydraulic resistance and the pore structure is introduced. Besides, the influence of the packing structure on the flow distribution is discussed. Numerical simulations using ANSYS FLUENT are also carried out to check the reliability of the network model.... (More)

Due to the high specific surface area, packed bed reactors are widely used in real engineering applications. The flow distribution, which is highly dependent on the packing structure, can be vital for the heat/mass transfer and reaction performances. This makes the study of the flow distribution in packed beds quite important. In the present paper, an equivalent network model based on the Voronoi tessellation is proposed to predict the flow field. In addition, a relationship between the hydraulic resistance and the pore structure is introduced. Besides, the influence of the packing structure on the flow distribution is discussed. Numerical simulations using ANSYS FLUENT are also carried out to check the reliability of the network model. It is found that firstly, the proposed correlation of hydraulic resistance can capture the flow characteristics with high accuracy and the flow distributions predicted by the network model fit well with the simulation results for 2-D ordered packing structures with mono-sized and dual-sized particles and disordered packing structures with mono-sized particles. Secondly, it is revealed that, the packing form and the pore dimension have a significant effect on the flow distribution. Thirdly, the flow rate in a certain channel is dependent on the hydraulic resistances of the adjacent channels rather than just on itself.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Electrical-fluidic analogy, Equivalent network model, Flow distribution, Hydraulic resistance, Voronoi tessellation (diagram)
in
Applied Thermal Engineering
volume
172
article number
115141
publisher
Elsevier
external identifiers
  • scopus:85081031749
ISSN
1359-4311
DOI
10.1016/j.applthermaleng.2020.115141
language
English
LU publication?
yes
id
b9b79ed5-7f0f-4726-bb47-6cbd228c57f9
date added to LUP
2020-03-17 11:30:08
date last changed
2020-10-07 06:55:34
@article{b9b79ed5-7f0f-4726-bb47-6cbd228c57f9,
  abstract     = {<p>Due to the high specific surface area, packed bed reactors are widely used in real engineering applications. The flow distribution, which is highly dependent on the packing structure, can be vital for the heat/mass transfer and reaction performances. This makes the study of the flow distribution in packed beds quite important. In the present paper, an equivalent network model based on the Voronoi tessellation is proposed to predict the flow field. In addition, a relationship between the hydraulic resistance and the pore structure is introduced. Besides, the influence of the packing structure on the flow distribution is discussed. Numerical simulations using ANSYS FLUENT are also carried out to check the reliability of the network model. It is found that firstly, the proposed correlation of hydraulic resistance can capture the flow characteristics with high accuracy and the flow distributions predicted by the network model fit well with the simulation results for 2-D ordered packing structures with mono-sized and dual-sized particles and disordered packing structures with mono-sized particles. Secondly, it is revealed that, the packing form and the pore dimension have a significant effect on the flow distribution. Thirdly, the flow rate in a certain channel is dependent on the hydraulic resistances of the adjacent channels rather than just on itself.</p>},
  author       = {Wang, Jingyu and Yang, Jian and Sundén, Bengt and Wang, Qiuwang},
  issn         = {1359-4311},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Applied Thermal Engineering},
  title        = {A network model and numerical simulations of flow distributions in packed bed reactors with different packing structures},
  url          = {http://dx.doi.org/10.1016/j.applthermaleng.2020.115141},
  doi          = {10.1016/j.applthermaleng.2020.115141},
  volume       = {172},
  year         = {2020},
}