Flow structure and heat transfer characteristics of an unconfined impinging air jet at high jet Reynolds numbers |
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Authors: | Y Ozmen E Baydar |
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Institution: | (1) Department of Mechanical Engineering, Karadeniz Technical University, 61080 Trabzon, Turkey |
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Abstract: | The flow and heat transfer characteristics of an unconfined air jet that is impinged normally onto a heated flat plate have
been experimentally investigated for high Reynolds numbers ranging from 30,000 to 70,000 and a nozzle-to-plate spacing range
of 1–10. The mean and turbulence velocities by using hot-wire anemometry and impingement surface pressures with pressure transducer
are measured. Surface temperature measurements are made by means of an infrared thermal imaging technique. The effects of
Reynolds number and nozzle-to-plate spacing on the flow structure and heat transfer characteristics are described and compared
with similar experiments. It was seen that the locations of the second peaks in Nusselt number distributions slightly vary
with Reynolds number and nozzle-to-plate spacing. The peaks in distributions of Nusselt numbers and radial turbulence intensity
are compatible for spacings up to 3. The stagnation Nusselt number was correlated for the jet Reynolds number and the nozzle-to-plate
spacing as Nu
st∝Re
0.69(H/D)0.019. |
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Keywords: | |
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