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Influence of Spanwise Pitch on Local Heat Transfer for Multiple Jets with Crossflow

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Title Influence of Spanwise Pitch on Local Heat Transfer for Multiple Jets with Crossflow
 
Creator KATTI, VV
PRABHU, SV
 
Subject staggered arrays
impinging jets
circular jets
air-jet
transfer distributions
reynolds-number
mach number
spent air
impingement
visualization
 
Description The influence of span wise jet-to-jet spacing on local heat transfer distribution due to multiple impinging circular air jets from an in-line rectangular array on a surface parallel to the jet plate is studied experimentally. The length-to-diameter ratio of the nozzles of the jet plate is 1.0. The flow, after impingement, is constrained to exit in one direction from the confined passage formed between the jet plate and the target plate. Mean jet Reynolds numbers based on the nozzle-exit diameter d covered are 3000,5000,7500, and 10,000, and jet-to-plate spacings studied are d, 2d, and 3d. Spanwise pitches considered are 2d, 4d, and 6d, keeping the streamwise pitch at 5d. For all configurations, the jet plates have ten spanwise rows in the streamwise direction and six jets in each spanwise row. The flat heat transfer surface is made of thin stainless steel metal foil. Local temperature distribution on the target plate is measured using thermal infrared camera. Wall static pressure on the target plate is measured in the streamwise direction to estimate crossflow velocities and individual jet velocities. Heat transfer characteristics are explained on the basis of flow distribution. A simple correlation is developed to predict the strearnwise distribution of the Nusselt number averaged over each spanwise strip resolved to one jet hole as a function of jet-flow and crossflow distributions.
 
Publisher AMER INST AERONAUT ASTRONAUT
 
Date 2011-07-15T09:13:03Z
2011-12-26T12:49:23Z
2011-12-27T05:40:48Z
2011-07-15T09:13:03Z
2011-12-26T12:49:23Z
2011-12-27T05:40:48Z
2008
 
Type Article
 
Identifier JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER, 22(4), 654-668
0887-8722
http://dx.doi.org/10.2514/1.35737
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4216
http://hdl.handle.net/10054/4216
 
Language en