Numerical study of flow inhomogeneity and heat transfer enhancement in structured packed beds
(2020) In Thermal Science 24(6 PART A). p.3533-3542- Abstract
Packed beds are widely used in engineering applications due to their high specific surface area and good heat transfer characteristics. A grille-sphere composite packed bed is proposed previously and has been proved to have higher overall heat transfer coefficient than the simple cubic packing structure. In the present paper, the flow inhomogeneities in both the grille-sphere composite packed bed and the simple cubic packing are studied and the relationship between the flow inhomogeneity and the heat transfer characteristics is revealed by numerical simulations. The simulations are performed on ANSYS FLUENT software. The turbulence flow is modelled by the renormalization group k- model. Both dispersion of the velocity distribution and... (More)
Packed beds are widely used in engineering applications due to their high specific surface area and good heat transfer characteristics. A grille-sphere composite packed bed is proposed previously and has been proved to have higher overall heat transfer coefficient than the simple cubic packing structure. In the present paper, the flow inhomogeneities in both the grille-sphere composite packed bed and the simple cubic packing are studied and the relationship between the flow inhomogeneity and the heat transfer characteristics is revealed by numerical simulations. The simulations are performed on ANSYS FLUENT software. The turbulence flow is modelled by the renormalization group k- model. Both dispersion of the velocity distribution and the residence time distribution are employed to assess the flow maldistribution. When the inlet velocity equals 2.17 m/s, the variance of the residence time distribution of the composite packed bed is 5.91% smaller than that of the simple cubic packing while the Nusselt number is 10.64% higher. The results indicate that less flow maldistribution can lead to heat transfer enhancement.
(Less)
- author
- WANG, Jingyu LU ; YANG, Jian LU ; SUNDEN, Bengt LU and WANG, Qiuwang
- organization
- publishing date
- 2020
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- flow inhomogeneity index, flow maldistribution, grille sphere composite packing, residence time distribution, structured packed bed
- in
- Thermal Science
- volume
- 24
- issue
- 6 PART A
- pages
- 10 pages
- publisher
- Vinca Inst Nuclear Sci
- external identifiers
-
- scopus:85098215226
- ISSN
- 0354-9836
- DOI
- 10.2298/TSCI200323274W
- language
- English
- LU publication?
- yes
- id
- 3b110778-4648-4d57-8416-b166ced9083f
- date added to LUP
- 2021-01-12 07:58:06
- date last changed
- 2023-11-06 08:38:07
@article{3b110778-4648-4d57-8416-b166ced9083f,
abstract = {{<p>Packed beds are widely used in engineering applications due to their high specific surface area and good heat transfer characteristics. A grille-sphere composite packed bed is proposed previously and has been proved to have higher overall heat transfer coefficient than the simple cubic packing structure. In the present paper, the flow inhomogeneities in both the grille-sphere composite packed bed and the simple cubic packing are studied and the relationship between the flow inhomogeneity and the heat transfer characteristics is revealed by numerical simulations. The simulations are performed on ANSYS FLUENT software. The turbulence flow is modelled by the renormalization group k- model. Both dispersion of the velocity distribution and the residence time distribution are employed to assess the flow maldistribution. When the inlet velocity equals 2.17 m/s, the variance of the residence time distribution of the composite packed bed is 5.91% smaller than that of the simple cubic packing while the Nusselt number is 10.64% higher. The results indicate that less flow maldistribution can lead to heat transfer enhancement.</p>}},
author = {{WANG, Jingyu and YANG, Jian and SUNDEN, Bengt and WANG, Qiuwang}},
issn = {{0354-9836}},
keywords = {{flow inhomogeneity index; flow maldistribution; grille sphere composite packing; residence time distribution; structured packed bed}},
language = {{eng}},
number = {{6 PART A}},
pages = {{3533--3542}},
publisher = {{Vinca Inst Nuclear Sci}},
series = {{Thermal Science}},
title = {{Numerical study of flow inhomogeneity and heat transfer enhancement in structured packed beds}},
url = {{http://dx.doi.org/10.2298/TSCI200323274W}},
doi = {{10.2298/TSCI200323274W}},
volume = {{24}},
year = {{2020}},
}