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Experimental investigations on heat transfer and frictional characteristics of a turbulator roughened solar air heater duct

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Title Experimental investigations on heat transfer and frictional characteristics of a turbulator roughened solar air heater duct
 
Creator BOPCHE, SB
TANDALE, MS
 
Subject optimal thermohydraulic performance
shaped rib roughness
rectangular channels
artificial roughness
absorber plate
transfer enhancement
transfer coefficient
square channel
broken ribs
flow
turbulator
solar air heater
roughness
heat transfer enhancement
 
Description An experimental investigation has been carried out to study the heat transfer coefficient and friction factor by using artificial roughness in the form of specially prepared inverted U-shaped turbulators on the absorber surface of an air heater duct. The roughened wall is uniformly heated while the remaining three walls are insulated. These boundary conditions correspond closely to those found in solar air heaters. The experiments encompassed the Reynolds number range from 3800 to 18000; ratio of turbulator height to duct hydraulic mean diameter is varied from, e/D(h) = 0.0186 to 0.03986 (D(h) = 37.63 mm, and e = 0.7 to 1.5 mm) and turbulator pitch to height ratio is varied from, p/e = 6.67 to 57.14 (p = 10 to 40 mm). The angle of attack of flow on turbulators, alpha = 90 degrees kept constant during the whole experimentation. The heat transfer and friction factor data obtained is compared with the data obtained from smooth duct under similar geometrical and flow conditions. As compared to the smooth duct, the turbulator roughened duct enhances the heat transfer and friction factor by 2.82 and 3.72 times, respectively. The correlations have been developed for area averaged Nusselt number and friction factor for turbulator roughened duct. (c) 2009
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-24T08:53:30Z
2011-12-26T12:56:49Z
2011-12-27T05:46:07Z
2011-08-24T08:53:30Z
2011-12-26T12:56:49Z
2011-12-27T05:46:07Z
2009
 
Type Article
 
Identifier INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 52(11-12), 2834-2848
0017-9310
http://dx.doi.org/10.1016/j.ijheatmasstransfer.2008.09.039
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10827
http://hdl.handle.net/10054/10827
 
Language en