Heat transfer in the stagnation region of an excited plane impinging jet

J. Sakakibara, Koichi Hishida

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Heat transfer and turbulence characteristics in the stagnation of an excited plane impinging jet have been investigated experimentally. Jet excitation was utilized to lock the phase of vortex motion and temperature variation of both fluid and wall. The velocity and temperature field were measured by digital particle image velocimetry (DPIV) and laser-induced fluorescence (LIF). In the mean flow field, the excitation makes closer the location of the impinging plate which has a maximum heat transfer coefficient. The local Nusselt number with excitation along the stagnation line is larger than that without excitation for an impinging plate set at a distance of 5-6 times the nozzle width, where the intensity of the fluctuating velocity normal to the wall and turbulent heat flux component normal to the wall are also increased. The turbulent heat flux and Reynold's stress that are mainly generated by counter-rotating vortex pairs contribute to reduce velocity and thermal boundary layer thickness. When the spanwise vortices arrive in the stagnation region, vorticity of the counter-rotating vortex pairs is intensified, and this enhances the intensity of the turbulent heat flux and Reynold's stress which causes high heat transfer instantaneously.

Original languageEnglish
Pages (from-to)1962-1969
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume62
Issue number597
Publication statusPublished - 1996 May
Externally publishedYes

Fingerprint

stagnation point
Vortex flow
heat transfer
vortices
Heat transfer
Heat flux
heat flux
Reynolds stress
excitation
counters
thermal boundary layer
boundary layer thickness
particle image velocimetry
Nusselt number
heat transfer coefficients
Vorticity
Velocity measurement
laser induced fluorescence
vorticity
Heat transfer coefficients

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Heat transfer in the stagnation region of an excited plane impinging jet. / Sakakibara, J.; Hishida, Koichi.

In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 62, No. 597, 05.1996, p. 1962-1969.

Research output: Contribution to journalArticle

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