Vortex structure and heat transfer in the stagnation region of a two-dimensional impinging jet (Simultaneous measurements of velocity and temperature fields by DPIV and LIF)

Jun Sakakibara, Koichi Hishida, Masanobu Maeda

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Velocity and temperature in the stagnation region of a two-dimensional impinging jet were simultaneously measured by digital particle image velocimetry (DPIV) and Laser-induced fluorescence (LIF). Instantaneous thermal flow fields and spatial correlation of the vorticity and the turbulent heat flux show that a streamwise vortex pair in the stagnation region sweeps cold fluid toward the wall and ejects high-temperature fluid toward the outer region. The weighted PDF of the turbulent heat flux indicates that the contribution of the ejection to the net heat flux is dominant. The streamwise vortex pair is transported from the free-jet region and the vorticity is amplified by the mean strain in the vicinity of the wall.

Original languageEnglish
Pages (from-to)18-25
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume60
Issue number573
Publication statusPublished - 1994 May
Externally publishedYes

Fingerprint

two dimensional jets
stagnation point
particle image velocimetry
Velocity measurement
laser induced fluorescence
Heat flux
heat flux
Temperature distribution
Vortex flow
temperature distribution
velocity distribution
Fluorescence
heat transfer
vortices
Heat transfer
Vorticity
vorticity
Lasers
high temperature fluids
Fluids

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "Velocity and temperature in the stagnation region of a two-dimensional impinging jet were simultaneously measured by digital particle image velocimetry (DPIV) and Laser-induced fluorescence (LIF). Instantaneous thermal flow fields and spatial correlation of the vorticity and the turbulent heat flux show that a streamwise vortex pair in the stagnation region sweeps cold fluid toward the wall and ejects high-temperature fluid toward the outer region. The weighted PDF of the turbulent heat flux indicates that the contribution of the ejection to the net heat flux is dominant. The streamwise vortex pair is transported from the free-jet region and the vorticity is amplified by the mean strain in the vicinity of the wall.",
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T1 - Vortex structure and heat transfer in the stagnation region of a two-dimensional impinging jet (Simultaneous measurements of velocity and temperature fields by DPIV and LIF)

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AU - Hishida, Koichi

AU - Maeda, Masanobu

PY - 1994/5

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N2 - Velocity and temperature in the stagnation region of a two-dimensional impinging jet were simultaneously measured by digital particle image velocimetry (DPIV) and Laser-induced fluorescence (LIF). Instantaneous thermal flow fields and spatial correlation of the vorticity and the turbulent heat flux show that a streamwise vortex pair in the stagnation region sweeps cold fluid toward the wall and ejects high-temperature fluid toward the outer region. The weighted PDF of the turbulent heat flux indicates that the contribution of the ejection to the net heat flux is dominant. The streamwise vortex pair is transported from the free-jet region and the vorticity is amplified by the mean strain in the vicinity of the wall.

AB - Velocity and temperature in the stagnation region of a two-dimensional impinging jet were simultaneously measured by digital particle image velocimetry (DPIV) and Laser-induced fluorescence (LIF). Instantaneous thermal flow fields and spatial correlation of the vorticity and the turbulent heat flux show that a streamwise vortex pair in the stagnation region sweeps cold fluid toward the wall and ejects high-temperature fluid toward the outer region. The weighted PDF of the turbulent heat flux indicates that the contribution of the ejection to the net heat flux is dominant. The streamwise vortex pair is transported from the free-jet region and the vorticity is amplified by the mean strain in the vicinity of the wall.

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