0
RESEARCH PAPERS

A Novel Semi-empirical Model for Evaluating Thermal Performance of Porous Metallic Foam Heat Sinks

[+] Author and Article Information
Tzer-Ming Jeng

Department of Mechanical Engineering, Air Force Institute of Technology, Gang-Shan, Kaohsiung 820, Taiwan

Li-Kang Liu

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(3), 223-234 (May 08, 2004) (12 pages) doi:10.1115/1.1997159 History: Received April 08, 2004; Revised May 08, 2004

A novel semi-empirical model with an improved single blow method for exploring the heat transfer performance of porous aluminum-foam heat sinks in a channel has been successfully developed. The influencing parameters such as the steady-state air preheating temperature ratio, Reynolds number and medium porosity on local and average heat transfer behavior of porous aluminum-foam heat sinks in a channel are explored. The heat transfer enhancement of using a porous heat sink in a channel to a hollow channel is, (Nu¯b)ss(Nu¯b)ε=1, much greater than unity and generally decrease with increasing Re. Furthermore, two new correlations of (Nu¯b)ss and (Nu¯i)ss in terms of ϴ,Re,Da,γ and ε are proposed. As compared with the results evaluated by the transient liquid crystal method, the channel wall temperatures predicted by the present semi-empirical model have a more satisfactory agreement with the experimental data, especially for the cases with smaller porosities. The limitations with relevant error maps of using the transient liquid crystal method in porous aluminum foam channels are finally postulated.

FIGURES IN THIS ARTICLE
<>
Copyright © 2005 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Schematic of physical model.

Grahic Jump Location
Figure 2

Schematic of thermal network model

Grahic Jump Location
Figure 3

Parametric effects on the distribution of Nub

Grahic Jump Location
Figure 4

Parametric effects on the transient variation of Nu¯b

Grahic Jump Location
Figure 5

Comparison of Nu¯i predicted by the present model with the existing experimental data

Grahic Jump Location
Figure 6

(Nu¯b)ss∕(Nu¯b)ε=1 distributions

Grahic Jump Location
Figure 7

Comparison of θw predicted by the present model with those by the transient liquid crystal method

Grahic Jump Location
Figure 8

Comparison of (Nu¯i)ss∕(Nu¯i)ε=1 predicted by the present model with those by the transient liquid crystal method

Grahic Jump Location
Figure 9

Error maps of using transient liquid crystal method in porous aluminum foam channels

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In