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Thermal performance characteristics of a rectangular duct by using artificial roughness on the absorber plate.

 PULKIT KUMAR
  29th-Sep-2017
Description: Artificially roughened surface of absorber plate is considered to be an effective technique for enhancing the rate of heat transfer to flowing air in the rectangular duct. Investigators reported various roughness geometries in literature for studying heat transfer and friction characteristics of an artificially roughened duct. This paper presents the results of an experimental investigation of heat transfer and friction in the flow of air in rectangular ducts having ‘S’ shaped rib on the absorber plate. In this experimental investigation having arc shape wire ribs arranged in ‘S’ shape encompassed Reynolds number (Re) from 3500 to 14,000, relative roughness height (e/D) values of 0.0433, relative roughness pitch (P/e) values of 8-14, with angle of attack (α) of 60º. It was observed that performance of roughened solar air heater duct is better than the performance of smooth duct for the range of roughness parameters investigated. Maximum enhancement in Nusselt number (Nu) and friction factor (f) have been found at relative roughness pitch (p/e) value of 8, arc angle (α) value of 60º and relative roughness height (e/Dh) value of 0.0433. For Nusselt number (Nu), the maximum enhancement has been obtained of the order of 2.28 times of the corresponding value of the smooth duct, however the friction factor (f) has also been seen to increase by 1.85 times of that of the smooth duct.
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Domain: Energy
Category: Photovoltaics/Solar
Maxims of Tech: Rules of Engagement for a Fast Changing Environment
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Thermal performance characteristics of a rectangular
duct by using artificial roughness on the absorber
plate.
Pulkit Kumar, Dr. J. L. Bhagoria
Department of Mechanical Engineering, Maulana Azad National Institute of
Technology, Bhopal – 462003
pulkitagrawal9@gmail.com, +919522859325

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Abstract
Artificially roughened surface of absorber plate is considered to be an e ... See more

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