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Heat Transfer From Novel Target Surface Structures to a Normally-Impinging, Submerged and Confined Water Jet

[+] Author Affiliations
N. Jeffers, J. Punch, E. Walsh

University of Limerick, Limerick, Ireland

Paper No. HT2009-88279, pp. 865-875; 11 pages
  • ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences
  • Volume 1: Heat Transfer in Energy Systems; Thermophysical Properties; Heat Transfer Equipment; Heat Transfer in Electronic Equipment
  • San Francisco, California, USA, July 19–23, 2009
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4356-7 | eISBN: 978-0-7918-3851-8
  • Copyright © 2009 by ASME


Contemporary electronic systems generate high component-level heat fluxes. Impingement cooling is an effective way to induce high heat transfer coefficients in order to meet thermal constraints. The objective of this paper was to experimentally investigate the heat transfer from five novel target surface structures to a normally-impinging, submerged and confined water jet. The five target structures were: a 90° vane; a 4×4 pin fin array; and three geometries which turn the flow away from, and back towards, the surface to be cooled. The experiments were conducted for Reynolds numbers of 500 ≤ Re ≤ 24 000. The confined impinging jet was geometrically constrained to a round, 8.5mm diameter, square-edged nozzle at a jet exit-to-target surface spacing, of H/D = 0.5. The heat transfer characteristics of the five novel target surfaces were non-dimensionally compared to a flat surface, and enhancements of up to 120% were recorded. Increases of up to 45% was noted when the surface area augmentation of the target surface structures was factored out. The findings of the paper are of practical relevance to the design of primary heat exchangers for high-flux thermal management applications.

Copyright © 2009 by ASME
Topics: Heat transfer , Water



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