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Role of various concave/convex walls exposed to solar heating on entropy generation during natural convection within porous right angled triangular enclosures
Pratibha Biswal,
Published in Elsevier Ltd
2016
Volume: 137
   
Pages: 101 - 121
Abstract
The solar heating of the inclined wall has the direct application for the processing of various porous materials. Analysis of natural convection is carried out for the built structure where the right wall is exposed to the sun and the left wall is exposed to the cold ambience in the presence of the bottom adiabatic wall. The current work also involves with the study of the entropy generation for natural convection in porous right angled triangular enclosures with the concave/convex right wall. The finite element simulations are performed for a wide range of Darcy number (10−5⩽Dam⩽10) at a representative high Rayleigh number (Ram=106) for various fluids of industrial importance (Prm=7.2: saline water, 0.7: air and 0.01: molten metal). An extensive investigation on the effect of Dam for the entropy generation due to heat transfer (Sθ) and fluid friction (Sψ) is carried out for various cases of wall curvatures. In addition, the total entropy generation rate (Stotal), average Bejan number (Beav) and average Nusselt number (Nul‾) are presented for various Dam and Prm. Overall, the built structure with the concave right wall (case 1) may be recommended for the thermal processing of fluids of all Prm at all Dam via the solar heating on the curved wall. © 2016 Elsevier Ltd
About the journal
JournalData powered by TypesetSolar Energy
PublisherData powered by TypesetElsevier Ltd
ISSN0038092X
Open AccessNo
Concepts (26)
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    Air
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    Enclosures
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    Entropy
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    Finite element method
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    Heat transfer
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    Heating
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    Liquid metals
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    Natural convection
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    Porous materials
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    Praseodymium
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    RADIUM
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    SALINE WATER
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    Solar heating
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    ADIABATIC WALL
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    CURVED WALLS
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    Entropy generation
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    Finite element simulations
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    Fluid friction
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    INCLINED WALLS
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    Rayleigh number
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    TRIANGULAR ENCLOSURE
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    Walls (structural partitions)
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    Convection
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    Friction
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    INDUSTRIAL PERFORMANCE
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    Porous medium