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RESEARCH PAPERS

Thermal Performance Investigation for Confined Heat Sinks By Using a Modified Transient Liquid Crystal Technique

[+] Author and Article Information
Ming-Chang Wu, Tiao-Yuan Wu, Sheng-Tzung Kuo, Meng-Ping Wang

Department of Power Mechanical Engineering,  National Tsing Hua University, Hsinchu 30013, Taiwan

Ying-Huei Hung

Department of Power Mechanical Engineering,  National Tsing Hua University, Hsinchu 30013, Taiwanyhhung@pme.nthu.edu.tw

J. Electron. Packag 127(4), 474-482 (Mar 18, 2005) (9 pages) doi:10.1115/1.2065787 History: Received December 04, 2004; Revised March 18, 2005

Abstract

A series of experimental investigations with a new modified transient liquid crystal method on the studies related to the fluid flow and heat transfer characteristics in a channel installed with a heat sink have been successfully performed. The parametric studies on the local and average effective heat transfer characteristics for confined heat sinks have been explored. The influencing parameters and conditions include air preheating temperature at channel inlet, flow velocity and heat sink types. Besides, a concept of the amount of enhanced heat transfer (AEHT) is introduced and defined as the ratio of $j∕f$. The $j∕f$ ratio is almost independent of Reynolds number for a specific confined heat sink. The $j∕f$ ratios are 0.0603 and 0.0124 for fully-confined and unconfined heat sinks, respectively.

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Figures

Figure 3

Comparison of average heat transfer coefficient between experimental data and existing results for sink (A)

Figure 4

Schematic of effective model employed in the study

Figure 5

Local heat transfer coefficient distributions for V=3.23m∕s at different air preheating temperatures for sink (A)

Figure 6

Effects of flow velocity and heat sink types on the distribution of local effective heat transfer coefficients

Figure 7

Effects of flow velocity and heat sink type on average effective heat transfer coefficients in channels

Figure 8

Relationship between friction factor and Reynolds number

Figure 9

Relationship between Colburn factor and Reynolds number

Figure 10

Relationship between j∕f and Reynolds number

Figure 2

Schematic of test section

Figure 1

Overall experimental setup with relevant measuring system

Errata

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