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Flow and thermal performance of graphite foam dimpled fin heat exchangers

Lin, Wamei LU ; Xie, Gongnan LU ; Sundén, Bengt LU and Wang, Qiuwang (2014) 15th International Heat Transfer Conference, IHTC 2014 In Proceedings of the 15th International Heat Transfer Conference, IHTC 2014
Abstract

Graphite foam is one kind of favorable materials in thermal engineering applications because of its high thermal conductivity and large specific surface area. However, there is an associated high flow resistance in the graphite foam resulting from the porous structure property. In order to reduce the flow resistance and enhance the heat transfer, dimpled fins could be applied in graphite foam heat exchangers. In this paper, the flow characteristics and thermal performance of graphite foam dimpled fin heat exchangers have been investigated numerically through three-dimensional simulations of fluid flow and heat transfer in graphite foam dimpled fin channels. The local thermal non-equilibrium model has been applied to analyze the thermal... (More)

Graphite foam is one kind of favorable materials in thermal engineering applications because of its high thermal conductivity and large specific surface area. However, there is an associated high flow resistance in the graphite foam resulting from the porous structure property. In order to reduce the flow resistance and enhance the heat transfer, dimpled fins could be applied in graphite foam heat exchangers. In this paper, the flow characteristics and thermal performance of graphite foam dimpled fin heat exchangers have been investigated numerically through three-dimensional simulations of fluid flow and heat transfer in graphite foam dimpled fin channels. The local thermal non-equilibrium model has been applied to analyze the thermal performance of the graphite foam dimple fin (porous zone), and the Forchheimer extended Darcy's law has been employed to consider the air pressure drop through the porous graphite foam. Moreover, the SST κ-ϵ turbulence model has been used to capture the turbulent flow characteristics outside the graphite foam region. The details of the fluid flow and heat transfer over the dimple fin are presented. The results show that the graphite foam fin with two sides dimple presents the highest values of the normalized Nusselt number (between 2.4 and 4.6) and overall thermal performance factor. Furthermore, the graphite foam dimple fin provides higher effectiveness than the conventional aluminum offset fin, wavy fin and louver fin concerning energy saving.

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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Computational methods, Dimpled fin, Graphite foam heat exchanger, Heat transfer enhancement, Thermal performance, Turbulent mixing
in
Proceedings of the 15th International Heat Transfer Conference, IHTC 2014
publisher
Begell House Inc.
conference name
15th International Heat Transfer Conference, IHTC 2014
external identifiers
  • scopus:84964556757
language
English
LU publication?
yes
id
22a93e21-6da2-40dd-ade9-2dca029af3ad
date added to LUP
2016-10-19 14:46:11
date last changed
2017-08-08 13:40:41
@inproceedings{22a93e21-6da2-40dd-ade9-2dca029af3ad,
  abstract     = {<p>Graphite foam is one kind of favorable materials in thermal engineering applications because of its high thermal conductivity and large specific surface area. However, there is an associated high flow resistance in the graphite foam resulting from the porous structure property. In order to reduce the flow resistance and enhance the heat transfer, dimpled fins could be applied in graphite foam heat exchangers. In this paper, the flow characteristics and thermal performance of graphite foam dimpled fin heat exchangers have been investigated numerically through three-dimensional simulations of fluid flow and heat transfer in graphite foam dimpled fin channels. The local thermal non-equilibrium model has been applied to analyze the thermal performance of the graphite foam dimple fin (porous zone), and the Forchheimer extended Darcy's law has been employed to consider the air pressure drop through the porous graphite foam. Moreover, the SST κ-ϵ turbulence model has been used to capture the turbulent flow characteristics outside the graphite foam region. The details of the fluid flow and heat transfer over the dimple fin are presented. The results show that the graphite foam fin with two sides dimple presents the highest values of the normalized Nusselt number (between 2.4 and 4.6) and overall thermal performance factor. Furthermore, the graphite foam dimple fin provides higher effectiveness than the conventional aluminum offset fin, wavy fin and louver fin concerning energy saving.</p>},
  author       = {Lin, Wamei and Xie, Gongnan and Sundén, Bengt and Wang, Qiuwang},
  booktitle    = {Proceedings of the 15th International Heat Transfer Conference, IHTC 2014},
  keyword      = {Computational methods,Dimpled fin,Graphite foam heat exchanger,Heat transfer enhancement,Thermal performance,Turbulent mixing},
  language     = {eng},
  publisher    = {Begell House Inc.},
  title        = {Flow and thermal performance of graphite foam dimpled fin heat exchangers},
  year         = {2014},
}