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Research Papers

Comparative Study of Thermal Performance of Longitudinal and Transversal-Wavy Microchannel Heat Sinks for Electronic Cooling

[+] Author and Article Information
Gongnan Xie

e-mail: xgn@nwpu.edu.cn

Jian Liu, Weihong Zhang

Engineering Simulation and Aerospace Computing (ESAC),
Northwestern Polytechnical University,
P.O. Box 552,
Xi'an, Shaanxi 710072, China

Yanquan Liu

The Key Laboratory of Thermal Sciences and Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China

Bengt Sunden

Division of Heat Transfer,
Department of Energy Sciences,
Lund University,
P.O. Box 118,
SE-22100, Lund, Sweden

1Corresponding author.

Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received November 28, 2012; final manuscript received January 15, 2013; published online March 28, 2013. Assoc. Editor: Giulio Lorenzini.

J. Electron. Packag 135(2), 021008 (Mar 28, 2013) (9 pages) Paper No: EP-12-1104; doi: 10.1115/1.4023530 History: Received November 28, 2012; Revised January 15, 2013

Liquid cooling incorporating microchannels are used to cool electronic chips in order to remove more heat load. However, such microchannels are often designed to be straight with rectangular cross section. In this paper, on the basis of straight microchannels having rectangular cross section (SRC), longitudinal-wavy microchannel (LWC), and transversal microchannel (TWC) were designed, respectively, and then the corresponding laminar flow and heat transfer were investigated numerically. Among them, the channel wall of LWC undulates along the flow direction according to a sinusoidal function while the TWC undulates along the transversal direction. The numerical results show that for removing an identical heat load, the overall thermal resistance of the LWC is decreased with increasing inlet Reynolds number while the pressure drop is increased greatly, so that the overall thermal performance of LWC is inferior to that of SRC under the considered geometries. On the contrary, TWC has a great potential to reduce the pressure drop compared to SRC, especially for higher wave amplitudes at the same Reynolds number. Thus the overall thermal performance of TWC is superior to that of SRC. It is suggested that the TWC can be used to cool chips effectively with much smaller pressure drop penalty. In addition to the overall thermal resistance, other criteria of evaluation of the overall thermal performance, e.g., (Nu/Nu0)/(f/f0) and (Nu/Nu0)/(f/f0)1/3, are applied and some controversial results are obtained.

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Figures

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Fig. 1

Schematic of single-branch straight rectangular microchannel (SRC)

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Fig. 2

Schematic of single-branch LWC

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Fig. 3

Schematic of a TWC heat sink

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Fig. 4

Schematic of the computational domain in transversal wavy microchannel

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Fig. 5

Pressure drop varying with the Reynolds number for LWC

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Fig. 6

Velocity vector plots for LWC (um = 1.4 m/s)

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Fig. 7

Heat transfer Nusselt number varying with the Reynolds number for LWC

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Fig. 8

Pressure drop varying with the Reynolds number for TWC

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Fig. 9

Temperature contours for TWC2, Re = 223

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Fig. 10

Heat transfer Nusselt number varying with the Reynolds number for TWC

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Fig. 11

Overall thermal resistance varying with the Reynolds number for TWC

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Fig. 12

Overall thermal resistance varying with pumping power for all microchannels

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Fig. 13

Pressure drop varying with overall thermal resistance for all microchannels

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Fig. 14

Comparison of thermal performance factors for all microchannels

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