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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

TURBULENT HEAT TRANSFER ON A PLANE SURFACE IN IMPINGEMENT ROUND PREMIXED FLAME JETS

Get access (open in a dialog) DOI: 10.1615/IHTC6.4120
pages 107-112

Resumo

This paper considers an experimental study in local heat transfer on an isothermal plate in the normal impinging round hot jet of combustion products of a rapid heating tunnel burner. A conductivity heat plug, impact tubes and fine wire thermocouples were used to measure heat fluxes and mean velocity- and temperature distributions. Some centerline relative turbulence intensity measurements were done with a Laser Doppler Anemometer. All measurements were done at two outlet Reynolds numbers: 1860 and 1050, the density ratio between combustion products and ambient air was 7,6. Heat transfer was measured at distances between 2D and 20D. The radial heat flux distributions are consistent with those obtained with impinging cold jets at Reynolds numbers below 2800. The stagnation point heat transfer within the core region (x/D ≤ 5) is in good agreement with the laminar boundary layer theory. In the developed region (x/D ≥ 12) strong free jet turbulence effects augmenting the heat transfer rates were observed.