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

Fingerprint

swirling
stagnation point
heat transfer
turbulent heat transfer
Heat transfer
particle image velocimetry
heat transfer coefficients
Velocity measurement
laser induced fluorescence
Heat transfer coefficients
upstream
Spatial distribution
Stretching
spatial distribution
Temperature distribution
temperature distribution
velocity distribution
Fluorescence
Lasers
Temperature

Keywords

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

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Cite this

Heat transfer mechanism of a swirling impinging jet in a stagnation region. / Nozaki, Atsushi; Igarashi, Yasumitsu; Hishida, Koichi.

In: Heat Transfer - Asian Research, Vol. 32, No. 8, 12.2003, p. 663-673.

Research output: Contribution to journalArticle

Nozaki, Atsushi ; Igarashi, Yasumitsu ; Hishida, Koichi. / Heat transfer mechanism of a swirling impinging jet in a stagnation region. In: Heat Transfer - Asian Research. 2003 ; Vol. 32, No. 8. pp. 663-673.
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