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Research Papers: Flows in Complex Systems

Numerically Investigating the Effects of Cross-Links in Scaled Microchannel Heat Sinks

[+] Author and Article Information
Minh Dang, Sung In Kim

Department of Mechanical and Industrial Engineering, Concordia University, Montreal, QC, H3G 1M8, Canada

Ibrahim Hassan1

Department of Mechanical and Industrial Engineering, Concordia University, Montreal, QC, H3G 1M8, Canadaibrahimh@alcor.concordia.ca

1

Corresponding author.

J. Fluids Eng 130(12), 121103 (Oct 23, 2008) (13 pages) doi:10.1115/1.3001093 History: Received July 14, 2007; Revised July 03, 2008; Published October 23, 2008

Thermal management as a method of heightening performance in miniaturized electronic devices using microchannel heat sinks has recently become of interest to researchers and the industry. One of the current challenges is to design heat sinks with uniform flow distribution. A number of experimental studies have been conducted to seek appropriate designs for microchannel heat sinks. However, pursuing this goal experimentally can be an expensive endeavor. The present work investigates the effect of cross-links on adiabatic two-phase flow in an array of parallel channels. It is carried out using the three-dimensional mixture model from the computational fluid dynamics software, FLUENT 6.3 . A straight channel and two cross-linked channel models were simulated. The cross-links were located at 1/3 and 2/3 of the channel length, and their widths were one and two times larger than the channel width. All test models had 45 parallel rectangular channels, with a hydraulic diameter of 1.59 mm. The results showed that the trend of flow distribution agrees with experimental results. A new design, with cross-links incorporated, was proposed and the results showed a significant improvement of up to 55% on flow distribution compared with the standard straight channel configuration without a penalty in the pressure drop. Further discussion about the effect of cross-links on flow distribution, flow structure, and pressure drop was also documented.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the experimental setup

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Figure 2

Experimental cross-linked channel plate

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Figure 4

Samples of chosen mesh

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Figure 5

Results of mesh independence test, taken from Case 1

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Figure 6

Flow distributions compared with experimental results

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Figure 7

Comparison of flow distributions for all test models

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Figure 8

Velocity vectors and streamlines in the header and channel entrance region (Case 1)

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Figure 9

Samples of flow sharing from cross-links (Case 1).

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Figure 10

Sample of flow sharing from cross-links for the proposed design (Case 1, β=0.0286)

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Figure 11

Samples of streamline along the cross-links at Case 1

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Figure 12

Velocity profiles along a center line of the channels (Case 1)

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Figure 13

Pressure drop comparison

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