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The Effect of Nozzle Geometry on the Heat Transfer Characteristics of Impinging Jet
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 Title & Authors
The Effect of Nozzle Geometry on the Heat Transfer Characteristics of Impinging Jet
Yun, Sun Hyeon; Kim, Dong Geon;
 
 Abstract
Experiments are conducted to show the effects of nozzle geometry on heat transfer of two-dimensional impinging jets. The channel and orifice type of nozzles are used. To control the nozzle exit turbulent intensity, a square rod is installed at the nozzle exit. The temperature distribution on the heated flat plate was measured with a thermochromic liquid crystal. All of the measurements are made over a range of nozzle-to-plate distance from 1 to 10 for Re=20,000. The maximum Nusselt number at the stagnation point for the channel and orifice nozzle is occurred at H2=9 and H2=7, respectively. It is observed that heat transfer rate for the channel nozzle shows higher than that of the orifice nozzle. When intial turbulent intensity was increased with the square rod installed at the nozzle exit, it is shown that the heat transfer rate are rapidly increased in 1≤H/B≤4.
 Keywords
Channel Nozzle;Orifice Nozzle;Square Rod;Turbulent Intensity;Convective Heat Transfer Coefficient;
 Language
Korean
 Cited by
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