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Cooling Performance of Plain-Plate-Fin Heat Sinks With Slot Jet Impingement

[+] Author Affiliations
M. C. Wu, Y. C. Lee, C. H. Peng, C. J. Fang, Y. H. Hung

National Tsing Hua University

Paper No. IMECE2006-13751, pp. 105-112; 8 pages
doi:10.1115/IMECE2006-13751
From:
  • ASME 2006 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 3
  • Chicago, Illinois, USA, November 5 – 10, 2006
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4786-1 | eISBN: 0-7918-3790-4
  • Copyright © 2006 by ASME

abstract

An experimental investigation on the thermal performance of slot jet impinging onto fully-confined and partially-confined heat sinks with plain-plate fins (ppf) is presented. The relevant parameters influencing the convective cooling performance with slot jet impingement include the ratio of heat sink height to jet separation distance (Hs /H), ratio of heat sink height to nozzle width (Hs /Wj ) and jet Reynolds number (Rej ). The thermal performance of fully-confined ppf heat sinks (Hs /H=1) is experimentally investigated. Besides, an effective theoretical model based on a developing channel flow with an impinging effect is successfully proposed to predict the average Nusselt numbers of fully-confined ppf heat sinks. Furthermore, a new correlation of average Nusselt numbers in terms of Hs /Wj and Rej is proposed for the cases of fully-confined ppf heat sinks. For partially-confined cases, a normalized Nusselt number, [Equation]Nuj /[Equation]Nuj,Hs /H=1 , is showed only dependent on Hs /H in the present study. A new correlation of [Equation]Nuj /[Equation]Nuj,Hs /H=1 in terms of Hs /H is proposed. This result manifests that the Nusselt numbers of partially-confined ppf heat sinks can properly be evaluated with the Nusselt numbers of fully-confined heat sinks and the normalized [Equation]Nuj /[Equation]Nuj,Hs /H=1 ratios. Finally, a generalized correlation of average Nusselt numbers in terms of Hs /H, Hs /Wj and Rej , which can be applied to both fully-confined and partially-confined heat sinks, is proposed. The maximum and average deviations between the correlations and the experimental data are 19.7% as well as 4.6%, respectively.

Copyright © 2006 by ASME
Topics: Cooling , Heat sinks

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