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Abstract
The mean heat-transfer coefficient was investigated on a circular cylinder placed symmetrically in a two-dimensional jet of limited height. The wall temperature of the cylinder was constant and the Reynolds number based on the cylinder diameter and the speed in the nozzle exit was around 20,000 to 50,000 for most experiments. Surprisingly, the maximum heat-transfer coefficient was obtained for a jet with a height of one eighth of the cylinder diameter and with the cylinder at a distance from the nozzle exit of about 2 to 8 times the jet height; in this case the heat-transfer coefficient was about 20% higher than that for a cylinder in unlimited parallel flow with negligible turbulence in the main stream and with an undisturbed speed equal to that in the nozzle exit. This result is explained by the ability of thin jets to adhere to curved surfaces (Coanda effect) and the high intensity of turbulence in a jet. Heat-transfer coefficients and pressure distributions were measured for variations of the jet height from 2·5 to 0·06 of the cylinder diameter.
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