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Effect of orifice shape in synthetic jet based impingement cooling

DSpace at IIT Bombay

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Title Effect of orifice shape in synthetic jet based impingement cooling
 
Creator CHAUDHARI, M
PURANIK, B
AGRAWAL, A
 
Subject heat-transfer distribution
smooth flat surface
impinging air-jet
nozzle
gas
synthetic jet
impinging flow
cavity orifice shape
impingement heat transfer
electronics cooling
 
Description The effect of shape of the orifice of a synthetic jet assembly on impingement cooling of a heated surface is experimentally investigated in this study. The shapes considered are square, circular, and rectangular, of different aspect ratios (in the range of 1-20) and hydraulic diameters (3.8-8 mm). The average heat transfer coefficient as a function of the distance between the orifice and the heated surface is obtained. The Reynolds number (Re) is in the range of 950-4000 based on average velocity, while the normalized axial distance varies between 1 and 25. The heat transfer enhancement with a square orifice is found to be larger than that with rectangular and Circular shapes at larger axial distances z/d > 5, for the same set of boundary conditions. It is also found that rectangular orifice with aspect ratio between 3 and 5 gives best performance at smaller axial distances. An attempt is made to explain this behavior on phenomenological grounds. The effect of orifice shape on cooling with a synthetic jet is reported for the first time, and the present results are expected to have significant practical implications. (C) 2009
 
Publisher ELSEVIER SCIENCE INC
 
Date 2011-07-27T08:12:05Z
2011-12-26T12:56:25Z
2011-12-27T05:45:09Z
2011-07-27T08:12:05Z
2011-12-26T12:56:25Z
2011-12-27T05:45:09Z
2010
 
Type Article
 
Identifier EXPERIMENTAL THERMAL AND FLUID SCIENCE, 34(2), 246-256
0894-1777
http://dx.doi.org/10.1016/j.expthermflusci.2009.11.001
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7167
http://hdl.handle.net/10054/7167
 
Language en