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Heatline analysis of heat recovery and thermal transport in materials confined within triangular cavities
, , , Arcot R. Balakrishnan
Published in
2010
Volume: 53
   
Issue: 19-20
Pages: 3615 - 3628
Abstract
Heat recovery from hot fluids in material processing industries is important for environmental and thermal management. Present work involves numerical visualization of heat flow in entrapped cavities filled with hot materials. The concept of heatline is used to visualize the heat energy trajectory. The system involves entrapped triangular cavities filled with hot fluid (Pr=. 0.015, 0.026, 0.7 and 1000). At low Rayleigh number (Ra), it is found that the heatlines are smooth and perfectly normal to the isotherms indicating the dominance of conduction for both the triangles. As Ra increases, flow slowly becomes convection dominant. Multiple heat flow circulations with high intensity are formed within the lower triangular domain especially for low Pr numbers, whereas, less intense convective heat flow circulations are observed for the upper triangle. Multiple circulations are absent for both the triangular domains involving fluids with higher Pr numbers. It is observed that the heat transfer rates are monotonic for the upper triangle whereas a few local maxima in heat transfer rates occur for smaller Pr within lower triangular domain. Overall, fluid with any Pr may be useful for enhanced heat transfer within the upper triangle but fluid with high Pr may be preferred for the lower triangle. © 2010 Elsevier Ltd.
About the journal
JournalInternational Journal of Heat and Mass Transfer
ISSN00179310
Open AccessNo
Concepts (27)
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    Convective heat
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    Enhanced heat transfer
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    Heat energy
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    Heat flows
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    HEAT RECOVERY
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    Heat transfer rate
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    HEATLINES
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    High intensity
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    HOT FLUIDS
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    HOT MATERIALS
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    Local maximum
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    MATERIAL PROCESSING
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    NUMERICAL VISUALIZATION
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    Rayleigh number
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    Thermal management
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    THERMAL TRANSPORT
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    TRIANGULAR CAVITIES
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    Drug products plants
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    FLOW MEASURING INSTRUMENTS
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    FLUIDS
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    Heat exchangers
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    Heat flux
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    Natural convection
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    Specific heat
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    Visualization
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    Waste heat
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    Heat transfer