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Technical Brief

Thermal and Fluid Transport in Micro-Open-Cell Metal Foams: Effect of Node Size

[+] Author and Article Information
Xiaohu Yang

Group of the Building Energy &
Sustainability Technology,
School of Human Settlements and Civil Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China;
MOE Key Lab for Multifunctional
Materials and Structures,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: xiaohuyang@xjtu.edu.cn

Yang Li, Lianying Zhang

Group of the Building Energy &
Sustainability Technology,
School of Human Settlements and Civil Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China

Liwen Jin

Group of the Building Energy &
Sustainability Technology,
School of Human Settlements and Civil Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: lwjin@xjtu.edu.cn

Wenju Hu

Beijing Municipal Key Lab of Heating,
Gas Supply, Ventilating and Air Conditioning Engineering,
Beijing University of Civil Engineering and Architecture,
Xicheng District,
Beijing 100044, China

Tian Jian Lu

MOE Key Lab for Multifunctional
Materials and Structures,
Xi'an Jiaotong University,
Xi'an 710049, China;
State Key Laboratory for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: tjlu@xjtu.edu.cn

1Corresponding authors.

Presented at the 5th ASME 2016 Micro/Nanoscale Heat & Mass Transfer International Conference. Paper No. MNHMT2016-6457.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 14, 2016; final manuscript received March 13, 2017; published online August 16, 2017. Assoc. Editor: Chun Yang.

J. Heat Transfer 140(1), 014502 (Aug 16, 2017) (6 pages) Paper No: HT-16-1385; doi: 10.1115/1.4037394 History: Received June 14, 2016; Revised March 13, 2017

Open-cell metal foams exhibit distinctive advantages in fluid control and heat transfer enhancement in thermal and chemical engineering. The thermofluidic transport characteristics at pore scale such as topological microstructure and morphological appearance significantly affect fluid flow and conjugated heat transfer in open-cell metal foams, important for practically designed applications. The present study employed an idealized tetrakaidecahedron unit cell (UC) model to numerically investigate the transport properties and conjugated heat transfer in highly porous open-cell metal foams (porosity—0.95). The effects of foam ligaments and nodes (size and cross-sectional shape) on thermal conduction, fluid flow, and conjugated heat transfer were particularly studied. Good agreement was found between the present predictions and the results in open literature. The effective thermal conductivity was found to decrease with increasing node-size-to-ligament ratio, while the permeability and volume-averaged Nusselt number were increased. This indicated that the effects of node size and shape upon thermofluidic transport need to be considered for open-cell metal foams having high porosities.

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References

Figures

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Fig. 1

(a) Highly porous open-celled aluminum (Al) foam fabricated via precision casting, (b) scanning electronic microscope image of foam topology, and (c) idealized tetrakaidecahedron UC consisted of square cross-sectioned ligaments with spherical nodes and circular cross-sectioned ligaments with cubic nodes

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Fig. 2

Computational domain and representative mesh for (a) effective thermal conductivity modeling, (b) fluid flow modeling, and (c) conjugated heat transfer modeling

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Fig. 3

Effective thermal conductivity of open-cell metal foam: (a) comparison with experimental data and analytical predictions in open literature and (b) effect of node size

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Fig. 4

Numerically predicted permeability of open-cell metal foam: (a) comparison with data in open literature, with α = 1 and (b) plotted as a function of node size

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Fig. 5

Volume-averaged Nusselt number plotted as a function of (a) Reynolds number and (b) node-to-ligament size ratio for ε = 0.95

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Fig. 6

Specific area for four typical foam UCs

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