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Research Papers: Heat and Mass Transfer

Thermal Performance Analysis of Biporous Metal Foam Heat Sink

[+] Author and Article Information
Yongtong Li

College of Pipeline and Civil Engineering,
China University of Petroleum (East China),
66 Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: lyt0903@163.com

Liang Gong

College of Pipeline and Civil Engineering,
China University of Petroleum (East China),
66 Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: lgong@upc.edu.cn

Minghai Xu

College of Pipeline and Civil Engineering,
China University of Petroleum (East China),
66 Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: minghai@upc.edu.cn

Yogendra Joshi

The George W. Woodruff School of
Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332-0405
e-mail: yogendra.joshi@me.gatech.edu

1Corresponding author.

Presented at the 2016 ASME 5th Micro/Nanoscale Heat & Mass Transfer International Conference. Paper No. MNHMT2016-6707.Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 30, 2016; final manuscript received January 26, 2017; published online March 15, 2017. Assoc. Editor: Zhuomin Zhang.

J. Heat Transfer 139(5), 052005 (Mar 15, 2017) (8 pages) Paper No: HT-16-1326; doi: 10.1115/1.4035999 History: Received May 30, 2016; Revised January 26, 2017

The present study presents a concept of biporous metal foam heat sink applicable to electronic cooling. This heat sink has two metal foam layers arranged in parallel along the primary flow direction, with different metal foam thickness, porosity, and pore density for each layer. The forced convective heat transfer in biporous metal foam heat sink is numerically investigated by employing the Forchheimer–Brinkman extended Darcy momentum equation and local thermal nonequilibrium energy equation. The effects of geometrical and morphological parameters on thermal and hydraulic performance are discussed in detail, and the heat transfer enhancement mechanism of biporous metal foam is analyzed. The thermal performance of biporous metal foam heat sink is compared with that of uniform metal foam heat sink. The results show that the thermal resistance of the biporous metal foam heat sink decreases with decrease of top layer metal foam porosity at a fixed bottom metal foam porosity of 0.9. It is seen that the biporous metal foam heat sink can outperform the uniform metal foam heat sink with a proper selection of foam geometrical and morphological parameters, which is attributed to the presence of high velocity gradient at the boundary layer that can enhance the convective heat transfer. The best observed thermal performance of biporous metal foam heat sink is achieved by employing 30 pores per inch (PPI) metal foam at the bottom layer, with a fixed 50 PPI metal foam at the top layer for the porosities of both layers equal to 0.9, and the optimal thickness of the bottom foam layer is about 1 mm.

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References

Figures

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Fig. 1

Physical model: (a) biporous metal foam heat sink, (b) the computational domain, and (c) the y–x cross section of computational domain

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Fig. 2

Validation of present numerical method with analytical solution

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Fig. 3

Effect of top layer metal foam porosity on the thermal resistance and pumping power

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Fig. 4

Effect of bottom layer metal foam thickness on the thermal resistance and pumping power

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Fig. 5

Effect of bottom layer metal foam pore density on the thermal resistance and pumping power

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Fig. 6

Effect of bottom layer metal foam thickness on the thermal resistance and pumping power for 30–50 PPI sample

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Fig. 7

The variation of thermal resistance and pumping power with Re

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Fig. 8

Temperature fields along the center y–x cross section for different Re. (a) Re = 200, (b)Re = 400, (c) Re = 600 and (d) Re = 800.

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Fig. 9

Comparison of dimensionless wall temperature of biporous heat sinks with uniform porosity metal foam heat sink along the centerline of the heated wall

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Fig. 10

Comparison of thermal resistance of biporous heat sink with uniform porosity metal foam heat sink

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Fig. 11

Comparison of temperature fields for biporous and uniform porosity metal foam heat sink

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Fig. 12

Comparison of the dimensionless velocity profile of biporous and uniform porosity metal foam heat sink

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Fig. 13

The thermal performance factor with Reynolds number for 30–50 PPI sample

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