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Role of various moving walls on energy transfer rates via heat flow visualization during mixed convection in square cavities
Published in Elsevier Ltd
2015
Volume: 82
   
Pages: 1 - 22
Abstract
Mixed convection in closed cavities are important for various processing industries especially those associated with conservation of energy. Finite element based simulations are carried out for two cases based on the motion of the horizontal wall(s) (cases 1a-1d) or vertical wall(s) (cases 2a-2c). Heat flow distribution within the cavity enclosed by isothermally hot bottom wall, cold side walls and insulated top wall is analyzed for various fluids with Prandtl number, Pr=0.026 and 7.2, Reynolds number, Re=10-100 and Grashof number, Gr=103-105. The direction of motion of wall(s) plays a significant role on the fluid flow field at Pr=0.026, Gr=103 and Re=10 due to dominant forced convection for both horizontally (cases 1a-1d) or vertically (cases 2a-2c) moving wall(s). At Pr=7.2, Gr=105 and Re=100, multiple convective heatline cells are observed for cases 1a-1d. It is found that, the strength of fluid or heatline circulation cells is less at Re=100 compared to Re=10 for cases 2a-2c due to weak buoyancy force at high Re. Energy transfer rates are assessed via local and average Nusselt numbers for cases 1a-1d and 2a-2c. © 2014 Elsevier Ltd.
About the journal
JournalData powered by TypesetEnergy
PublisherData powered by TypesetElsevier Ltd
ISSN03605442
Open AccessNo
Concepts (22)
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    Energy transfer
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    Heat transfer
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    Mixed convection
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    Prandtl number
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    Reynolds number
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    Temperature control
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    Conservation of energy
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    Direction of motion
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    ENERGY-TRANSFER RATE
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    HEAT FLOW DISTRIBUTION
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    HEATLINE ANALYSIS
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    MOVING WALLS
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    Processing industry
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    SQUARE ENCLOSURES
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    Flow of fluids
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    Convection
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    ENERGY FLOW
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    Finite element method
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    Fluid flow
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    Heat flow
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    Visualization
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    CALLUNA VULGARIS