Heat transfer of impinging jet-array over convex-dimpled surface

Shyy Woei Chang, Yih Jena Jan, Shuen Fei Chang

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44 Citations (Scopus)


A detailed heat transfer measurement over a convex-dimpled surface of impinging jet-array with three eccentricities (E/H) between jet-centre and dimple-centre is performed. These surface dimples considerably modify heat transfers from smooth-walled scenarios due to different impinging topologies for jet array with modified inter-jet reactions. Heat transfer variations caused by adjusting jet Reynolds number (Re) and separation distance (S/Dj) over the ranges of 5000 ≤ Re ≤ 15,000 and 0.5 ≤ S/Dj ≤ 11 with three eccentricities of E/H = 0, 1/4 and 1/2 are examined. A selection of experimental data illustrates the isolated and interactive influences of Re, S/Dj and E/H on local and spatially averaged heat transfers. In conformity with the experimentally revealed heat transfer physics, a regression-type analysis is performed to generate a set of heat transfer correlations, which permit the evaluations of spatially averaged Nusselt numbers over central jet region of dimpled impinging surface.

Original languageEnglish
Pages (from-to)3045-3059
Number of pages15
JournalInternational Journal of Heat and Mass Transfer
Issue number17-18
Publication statusPublished - 2006 Aug 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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