The heat transfer mechanism of a swirling impinging jet in the stagnation region

Atsushi Nozaki, Yasumitsu Igarashi, Koichi Hishida

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Heat transfer mechanism of a swirling impinging jet in the stagnation region has been experimentally examined, using a combined technique of particle image velocimetry (PIV) and laser induced fluorescence (LIF) for the simultaneous measurements of velocity and temperature fields. The present study indicated that the radial width of the jet was stretched with increasing swirl number Sw, and that this stretching phenomena contributes to radially the maximum local heat transfer coefficient. At the stagnation region, the flow near the heated surface was mixed intermittently by reverse flows toward upstream, and spatial distributions of temperature were well correlated with instantaneous velocity vector maps. The dynamic behavior of recirculation zones, which were attributed to swirl number Sw and impinging distance, mainly determined the turbulent heat transfer at the stagnation region.

Original languageEnglish
Pages (from-to)2300-2305
Number of pages6
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume68
Issue number672
Publication statusPublished - 2002 Aug

Fingerprint

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

Keywords

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

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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

In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 68, No. 672, 08.2002, p. 2300-2305.

Research output: Contribution to journalArticle

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