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Research Papers

Heat Transfer and Pressure Drop Characteristics of Finned Metal Foam Heat Sinks Under Uniform Impinging Flow

[+] Author and Article Information
S. S. Feng

MOE Key Laboratory for Multifunctional
Materials and Structures (LMMS)
State Key Laboratory of Mechanical Structure
Strength and Vibration,
Xi’an Jiaotong University,
Xi’an, Shaanxi 710049, China

J. J. Kuang

MOE Key Laboratory for Multifunctional
Materials and Structures (LMMS)
School of Energy and Power Engineering,
Xi’an Jiaotong University,
Xi’an, Shaanxi 710049, China

T. J. Lu

MOE Key Laboratory for Multifunctional
Materials and Structures (LMMS)
State Key Laboratory of Mechanical Structure
Strength and Vibration,
Xi’an Jiaotong University,
Xi’an, Shaanxi 710049, China
e-mail: tjlu@mail.xjtu.edu.cn

K. Ichimiya

Department of Mechanical Engineering,
University of Yamanashi,
4-3-11 Kofu,
Yamanashi 400-8511, Japan

1Corresponding author.

Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received November 22, 2013; final manuscript received January 28, 2015; published online February 20, 2015. Assoc. Editor: Pradip Dutta.

J. Electron. Packag 137(2), 021014 (Jun 01, 2015) (12 pages) Paper No: EP-13-1131; doi: 10.1115/1.4029722 History: Received November 22, 2013; Revised January 28, 2015; Online February 20, 2015

A numerical investigation was carried out to characterize the thermal performance of finned metal foam heat sinks subject to an impinging air flow. The main objective of the study was to quantify the effects of all relevant configurational parameters (channel length, channel width, fin thickness, and fin height) of the heat sink upon the thermal performance. Open-cell aluminum foam having fixed porosity of 0.9118 and fixed pore density of five pores per inch (PPI) was used in the study. A previously validated model based on the porous medium approach was employed for the numerical simulation. Various simulation cases for different combinations of channel parameters were carried out to obtain the Nusselt number correlation. Based on the inviscid impinging flow, a pressure drop correlation was derived for impinging flow in finned metal foam heat sinks. By using these correlations, the thermal performance of finned metal foam heat sinks was compared with the conventional plate-fin heat sinks. It was demonstrated that the finned metal foam heat sinks outperformed the plate-fin heat sinks on the basis of given weight or given pumping power.

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Figures

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Fig. 1

Finned metal foam heat sink: (a) prototype and (b) schematic illustration

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Fig. 2

Computational domain showing 1/4 of a fin–foam channel

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Fig. 3

Nusselt number plotted as a function of (L/2)/(ReDh) for selected values of channel length L: (a) H = 10 mm; (b) H = 30 mm; (c) H = 50 mm; and (d) H = 68 mm, with s = 6 mm and t = 1 mm

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Fig. 4

Nusselt number plotted as a function of (L/2)/(ReDh) for selected values of channel width s: (a) H = 10 mm and (b) H = 68 mm, with L = 68 mm and t = 1 mm

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Fig. 5

Nusselt number plotted as a function of (L/2)/(ReDh) for selected values of fin thickness t: (a) H = 10 mm; (b) H = 30 mm; (c) H = 50 mm; and (d) H = 68 mm, with s = 15 mm and L = 68 mm

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Fig. 6

Nusselt number plotted as a function of (L/2)/(ReDh) for selected values of heat sink height H, with s = 6 mm, L = 68 mm, and t = 1 mm

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Fig. 7

Effect of channel width on pressure drop in foam-filled channel: (a) H = 10 mm and (b) H = 40 mm

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Fig. 8

Metal foam subjected to uniform impinging flow

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Fig. 9

Comparison of pressure drop between full numerical simulation and correlations for L = 40 mm

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Fig. 10

Comparison of pressure drop between numerical simulation and correlations for L = 68 mm

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Fig. 11

Comparison of pressure drop between full numerical simulation and correlations for L = 120 mm

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Fig. 12

Streamlines distribution for (a) inviscid impinging flow and (b) impinging flow in metal foam (H/L=0.5 and Vin = 3 m/s)

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Fig. 13

Thermal resistance of plate-fin heat sinks plotted as a function of fin number in comparison with that of fined metal foam heat sinks having 4, 6, 8, and 10 fins (t = 1 mm, L = W = 50 mm, and H = 25 mm)

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Fig. 14

Comparison of pressure drop between plate-fin heat sinks and fined metal foam heat sinks (t = 1 mm, L = W = 50 mm, and H = 25 mm)

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