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Entropy 2016, 18(10), 378; doi:10.3390/e18100378

Second Law Analysis of Nanofluid Flow within a Circular Minichannel Considering Nanoparticle Migration

Mechanical Engineering Department, School of Energy, Kermanshah University of Technology, Kermanshah 6715685420, Iran
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Academic Editor: Eliodoro Chiavazzo
Received: 19 August 2016 / Revised: 14 October 2016 / Accepted: 18 October 2016 / Published: 21 October 2016
(This article belongs to the Special Issue Limits to the Second Law of Thermodynamics: Experiment and Theory)

Abstract

In the current research, entropy generation for the water–alumina nanofluid flow is studied in a circular minichannel for the laminar regime under constant wall heat flux in order to evaluate irreversibilities arising from friction and heat transfer. To this end, simulations are carried out considering the particle migration effects. Due to particle migration, the nanoparticles incorporate non-uniform distribution at the cross-section of the pipe, such that the concentration is larger at central areas. The concentration non-uniformity increases by augmenting the mean concentration, particle size, and Reynolds number. The rates of entropy generation are evaluated both locally and globally (integrated). The obtained results show that particle migration changes the thermal and frictional entropy generation rates significantly, particularly at high Reynolds numbers, large concentrations, and coarser particles. Hence, this phenomenon should be considered in examinations related to energy in the field of nanofluids. View Full-Text
Keywords: nanofluid; second law of thermodynamics; entropy generation; particle migration; concentration distribution nanofluid; second law of thermodynamics; entropy generation; particle migration; concentration distribution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bahiraei, M.; Cheraghi Kazerooni, N. Second Law Analysis of Nanofluid Flow within a Circular Minichannel Considering Nanoparticle Migration. Entropy 2016, 18, 378.

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