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Received December 7, 2013
Accepted March 19, 2014
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Entropy Generation Analysis for Various Cross-sectional Ducts in Fully Developed Laminar Convection with Constant Wall Heat Flux
Department of Mechanical Engineering, Islamic Azad University-South branch, Tehran, Iran 1Department of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran
Korean Chemical Engineering Research, June 2014, 52(3), 294-301(8), 10.9713/kcer.2014.52.3.294 Epub 2 June 2014
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Abstract
This study focuses on analysis and comparison of entropy generation in various cross-sectional ducts along with fully developed laminar flow and constant uniform wall heat flux. The obtained results were compared in ducts with circular, semicircular, and rectangular with semicircular ends, equilateral triangular, and square and symmetrical hexagonal cross.sectional areas. These results were separately studied for aspect ratio of different rectangular shapes. Characteristics of fluid were considered at average temperature between outlet and inlet ducts. Results showed that factors such as Reynolds number, cross section, hydraulic diameter, heat flux and aspect ratio were effective on entropy generation, and these effects are more evident than heat flux and occur more in high heat fluxes. Considering the performed comparisons, it seems that semicircular and circular cross section generates less entropy than other cross sections.
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Aghanajafi C, Mansourizadeh M, J. Fusion Energy, 26, 299 (2007)
Langeroudi HG, Aghanajafi C, J. Fusion Energy, 25, No. ¾ (2006)
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Haddad OM, Alkam MK, Khasawneh MT, Energy, 29(1), 35 (2004)
