Optimization principles for convective heat transfer

Optimization for convective heat transfer plays a significant role in energy saving and high-efficiency utilizing. We compared two optimization principles for convective heat transfer, the minimum entropy generation principle and the entransy dissipation extremum principle, and analyzed their physic...

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Bibliographic Details
Published in:Energy (Oxford) Vol. 34; no. 9; pp. 1199 - 1206
Main Authors: Chen, Qun, Wang, Moran, Pan, Ning, Guo, Zeng-Yuan
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01.09.2009
Elsevier
Subjects:
Applied sciences
Convective heat transfer
Energy
Energy. Thermal use of fuels
Entransy dissipation
Entropy generation
Exact sciences and technology
Heat transfer
Optimization principle
Theoretical studies. Data and constants. Metering
Convective heat transfer
Entransy dissipation
Optimization principle
Entropy generation
ISSN:0360-5442
Online Access:Get full text
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Summary:Optimization for convective heat transfer plays a significant role in energy saving and high-efficiency utilizing. We compared two optimization principles for convective heat transfer, the minimum entropy generation principle and the entransy dissipation extremum principle, and analyzed their physical implications and applicability. We derived the optimization equation for each optimization principle. The theoretical analysis indicates that both principles can be used to optimize convective heat-transfer process, subject to different objectives of optimization. The minimum entropy generation principle, originally derived from the heat engine cycle process, optimizes the convective heat-transfer process with minimum usable energy dissipation focusing on the heat–work conversion. The entransy dissipation extremum principle however, originally for pure heat conduction process, optimizes the heat-transfer process with minimum heat-transfer ability dissipation, and therefore is more suitable for optimization of the processes not involving heat–work conversion. To validate the theoretical results, we simulated the convective heat-transfer process in a two-dimensional foursquare cavity with a uniform heat source and different temperature boundaries. Under the same constraints, the results indicate that the minimum entropy production principle leads to the highest heat–work conversion while the entransy dissipation extremum principle yields the maximum convective heat-transfer efficiency.
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ISSN:0360-5442
DOI:10.1016/j.energy.2009.04.034