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Assessment of flow pattern and temperature profiles by residence time distribution in typical structured packed beds

Wang, Jingyu LU ; Yang, Jian LU ; Sundén, Bengt LU and Wang, Qiuwang (2020) In Numerical Heat Transfer; Part A: Applications 77(6). p.559-578
Abstract

The flow and temperature fields in packed beds are rather complex but are of great importance since they will influence macroscopic parameters and the overall performance of the packed bed system. Regions with either too high or too low velocity are not preferred since they will decrease the heat and mass transfer characteristics of packed beds. The residence time distribution (RTD) is a way to assess the characteristics of the flow maldistribution, where a narrower distribution is closer to the ideal plug flow with less dispersion. In this article, the RTD in three typical structured packed beds, namely, the simple cubic (SC) packing, the body-centered cubic (BCC) packing and the face-centered cubic (FCC) packing, are studied by using... (More)

The flow and temperature fields in packed beds are rather complex but are of great importance since they will influence macroscopic parameters and the overall performance of the packed bed system. Regions with either too high or too low velocity are not preferred since they will decrease the heat and mass transfer characteristics of packed beds. The residence time distribution (RTD) is a way to assess the characteristics of the flow maldistribution, where a narrower distribution is closer to the ideal plug flow with less dispersion. In this article, the RTD in three typical structured packed beds, namely, the simple cubic (SC) packing, the body-centered cubic (BCC) packing and the face-centered cubic (FCC) packing, are studied by using ANSYS FLUENT. Results show that, firstly, the RTD curve can be used to diagnose the flow pattern in packed beds where the skewed peak indicates the channeling effect and a long tail relates to recirculation. It is revealed secondly that, FCC packing has the narrowest RTD curve in the studied structures, BCC packing comes second and SC packing has the flattest RTD curve, which demonstrates that the flow uniformity in FCC packing is the best. For the same packing form, the flow is less maldistributed at higher velocity. Finally, it is shown that the packing form with less dispersion, which behaves more like the ideal plug flow, has a more uniform distribution of the particle-to-fluid heat transfer coefficient near the particle surface.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Numerical Heat Transfer; Part A: Applications
volume
77
issue
6
pages
20 pages
publisher
Taylor & Francis
external identifiers
  • scopus:85078430404
ISSN
1040-7782
DOI
10.1080/10407782.2020.1713694
language
English
LU publication?
yes
id
1dcf4aff-08ce-488c-96a5-e2444e48f1bd
date added to LUP
2020-02-06 13:20:44
date last changed
2023-11-19 23:26:56
@article{1dcf4aff-08ce-488c-96a5-e2444e48f1bd,
  abstract     = {{<p>The flow and temperature fields in packed beds are rather complex but are of great importance since they will influence macroscopic parameters and the overall performance of the packed bed system. Regions with either too high or too low velocity are not preferred since they will decrease the heat and mass transfer characteristics of packed beds. The residence time distribution (RTD) is a way to assess the characteristics of the flow maldistribution, where a narrower distribution is closer to the ideal plug flow with less dispersion. In this article, the RTD in three typical structured packed beds, namely, the simple cubic (SC) packing, the body-centered cubic (BCC) packing and the face-centered cubic (FCC) packing, are studied by using ANSYS FLUENT. Results show that, firstly, the RTD curve can be used to diagnose the flow pattern in packed beds where the skewed peak indicates the channeling effect and a long tail relates to recirculation. It is revealed secondly that, FCC packing has the narrowest RTD curve in the studied structures, BCC packing comes second and SC packing has the flattest RTD curve, which demonstrates that the flow uniformity in FCC packing is the best. For the same packing form, the flow is less maldistributed at higher velocity. Finally, it is shown that the packing form with less dispersion, which behaves more like the ideal plug flow, has a more uniform distribution of the particle-to-fluid heat transfer coefficient near the particle surface.</p>}},
  author       = {{Wang, Jingyu and Yang, Jian and Sundén, Bengt and Wang, Qiuwang}},
  issn         = {{1040-7782}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{6}},
  pages        = {{559--578}},
  publisher    = {{Taylor & Francis}},
  series       = {{Numerical Heat Transfer; Part A: Applications}},
  title        = {{Assessment of flow pattern and temperature profiles by residence time distribution in typical structured packed beds}},
  url          = {{http://dx.doi.org/10.1080/10407782.2020.1713694}},
  doi          = {{10.1080/10407782.2020.1713694}},
  volume       = {{77}},
  year         = {{2020}},
}