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Analysis of entropy production vs. energy efficiencies during natural convection in porous trapezoidal cavities exposed to various thermal ambience
Pratibha Biswal,
Published in Taiwan Institute of Chemical Engineers
2016
Volume: 65
   
Pages: 118 - 133
Abstract
Natural convection in trapezoidal cavities is important in industrial processing applications and the entropy generation technique has been used for the assessment of the energy efficiency. The results are obtained in terms of the isotherms (θ), streamlines (ψ), entropy generation due to the heat transfer (Sθ) and fluid friction Sψ), total entropy generation (Stotal), average Bejan number (Beav) and average Nusselt numbers (Nul- and Nub-). It was found that, Sθ, max occurs at the top corners for the case 1 (uniformly heated bottom wall, adiabatic top wall and linearly heated side walls) whereas, Sθ, max occurs at the bottom right corner for the case 2 (linearly heated left wall and isothermally cold right wall with other walls identical with the case 1). On the other hand, Sψ, max occurs along the side walls for the case 1 whereas, Sψ, max occurs along the bottom or right walls for the case 2. The local maxima of entropy generation terms (Sθ, max, Sψ, max) contribute significantly on the total entropy generation (Stotal). Finally, the optimal strategy for natural convection involving the cases 1 and 2 are decided based on the interplay between Stotal and Nub- for various ranges of modified Darcy numbers (Dam). © 2016 Taiwan Institute of Chemical Engineers.
About the journal
JournalJournal of the Taiwan Institute of Chemical Engineers
PublisherTaiwan Institute of Chemical Engineers
ISSN18761070
Open AccessNo
Concepts (16)
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    Energy efficiency
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    Heat transfer
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    Isotherms
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    Natural convection
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    Nusselt number
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    Porous materials
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    Temperature control
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    Entropy generation
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    Entropy production
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    Fluid friction
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    INDUSTRIAL PROCESSING APPLICATIONS
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    LINEARLY HEATED SIDE WALLS
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    Local maximum
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    Optimal strategies
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    Trapezoidal cavity
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    Entropy