Heat transfer mechanism of a swirling impinging jet in a stagnation region

Atsushi Nozaki, Yasumitsu Igarashi, Koichi Hishida

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Heat transfer characteristics of a swirling impinging jet have been experimentally examined using a combined particle image velocimetry (PIV) and laser-induced fluorescence (LIF) technique for simultaneous measurement of velocity and temperature fields. The present study shows that the radial width of the jet stretches with increasing swirl intensity, and that the stretching phenomenon contributes to the maximum local heat transfer coefficient. At the stagnation region, the flow near the heated surface is mixed intermittently by reverse flows toward upstream, and spatial distributions of temperature are correlated with instantaneous velocity vector maps. The dynamic behavior of recirculation zones, attributed to swirl number Sw and impinging distance, mainly determines the turbulent heat transfer at the stagnation region.

Original languageEnglish
Pages (from-to)663-673
Number of pages11
JournalHeat Transfer - Asian Research
Volume32
Issue number8
DOIs
Publication statusPublished - 2003 Dec 1

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Keywords

  • Heat transfer mechanism
  • Laser-induced fluorescence (LIF)
  • Measurement of turbulent heat flux
  • Particle image velocimetry (PIV)
  • Swirling impinging jet

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Fluid Flow and Transfer Processes

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