Heat transfer studies of the oblique impingement of round jets upon a curved surface |
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Authors: | A A Tawfek |
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Institution: | (1) Marine Engineering and Naval Architecture Department Port-Said, Egypt, EG |
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Abstract: | The effect of jet inclination of the local heat transfer under an obliquely impinging round air jet striking on isothermal
circular cylinder is experimentally investigated. The circumferential heat transfer distribution as well as axial Nusselt
number is measured. The considered parameters are jet Reynolds number in range of 3800–40,000, and jet inclination angle,
ranging from 90 to 20. The experiments are carried out for nozzle sizes, d=3, 5 and 7 mm, and separation distance from 7 to 30 of the nozzle diameter. The output results indicated that the point of
maximum heat transfer along the x-axis is shifted upstream and the local heat transfer distribution changed as a function of jet inclination. The magnitude
of the shift was found to be significantly higher than that observe for a flat plate. The increasing inclination caused increasing
asymmetry around the point of maximum heat transfer, with the upstream side of heat transfer profile dropping off more rapidly
than the downstream side. Correlations of both the magnitude and shift of maximum heat transfer point are presented. The surface
average heat transfer rate is calculated and compared with the normal impingement.
Received on 5 June 2000 / Published online: 29 November 2001 |
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