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Influence of the Shape of the Orifice on the Local Heat Transfer Distribution of a Flat Plate Impinged by Under-Expanded Sonic Jets

DSpace at IIT Bombay

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Title Influence of the Shape of the Orifice on the Local Heat Transfer Distribution of a Flat Plate Impinged by Under-Expanded Sonic Jets
 
Creator LIMAYE, MD
VEDULA, RP
PRABHU, SV
 
Subject axis switching
heat transfer
axis rotation
vorticity dynamics
RECOVERY TEMPERATURE
AIR-JET
FLOW
FIELD
 
Description Experiments are carried out for the circular, square, and equilateral triangular orifices of the same contraction ratio in order to explore the heat transfer characteristics for nozzle pressure ratios of 2.36, 3.04, 3.72, 4.4, and 5.08 at z/d=2, 4, 6, and 8. The presence of vena contracta and shock cells and its locations are estimated from the impact pressure distribution along the axial direction. The pressure drop during the initial expansion is minimal for the equilateral triangular orifice. However, this pressure drop is comparable for the square and circular orifices. The heat transfer characteristics of the circular orifice are nearly axisymmetric, but that for non-circular jets are asymmetric, and the three dimensional effects are clearly observed. This is inferred through the spatial gradients of the Nusselt number and adiabatic wall temperature distributions. The linear correlations for the average Nusselt number are proposed for the circular, square, and equilateral triangular orifices.
 
Publisher TAYLOR & FRANCIS INC
 
Date 2014-12-28T12:36:05Z
2014-12-28T12:36:05Z
2014
 
Type Article
 
Identifier EXPERIMENTAL HEAT TRANSFER, 27(5)403-427
0891-6152
1521-0480
http://dx.doi.org/10.1080/08916152.2013.782378
http://dspace.library.iitb.ac.in/jspui/handle/100/16553
 
Language English