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Comparison of heat transfer distributions on a flat plate impinged by under-expanded jets from a convergent nozzle and a circular orifice

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Title Comparison of heat transfer distributions on a flat plate impinged by under-expanded jets from a convergent nozzle and a circular orifice
 
Creator LIMAYE, MD
VEDULA, RP
PRABHU, SV
 
Subject UNDEREXPANDED SONIC JET
RECOVERY TEMPERATURE
TRANSFER ENHANCEMENT
FLOW
FIELD
VORTICITY
 
Description Experiments are carried out for a circular orifice and a nozzle for the same contraction ratio to explore the heat transfer characteristics. The pressure ratios covered in this study are 2.36, 3.04, 3.72, 4.4 and 5.08 for jet to plate distances (z/d) of 2, 4, 6 and 8. The presence of vena contracta and absence of the stagnation bubble in the orifice flow are confirmed from the surface pressure distributions. It is found that higher Nusselt number for the orifice than the nozzle are due to different shock structures and shear layer dynamics. Peak Nusselt number is found as high as 84 % than that for the nozzle. In the wall jet region, the heat transfer rates for the orifice and nozzle are almost of the same order, thus producing steeper temperature gradients under similar operating conditions. The average heat transfer rates are almost 25 % higher for the orifice than that of the nozzle. The recovery factors are in general higher in case of orifice than the nozzle. However, this has not resulted in decreasing the heat transfer rates due to shear layer dynamics.
 
Publisher SPRINGER
 
Date 2014-10-15T17:15:16Z
2014-10-15T17:15:16Z
2013
 
Type Article
 
Identifier HEAT AND MASS TRANSFER, 49(3)309-326
http://dx.doi.org/10.1007/s00231-012-1089-4
http://dspace.library.iitb.ac.in/jspui/handle/100/15303
 
Language en