Non-equilibrium thermodynamic analysis of double diffusive, nanofluid forced convection in microreactors with radiation effects

Govone, L., Torabi, M., Hunt, G. and Karimi, N. (2017) Non-equilibrium thermodynamic analysis of double diffusive, nanofluid forced convection in microreactors with radiation effects. Entropy, 19(12), 690. (doi:10.3390/e19120690)

Govone, L., Torabi, M., Hunt, G. and Karimi, N. (2017) Non-equilibrium thermodynamic analysis of double diffusive, nanofluid forced convection in microreactors with radiation effects. Entropy, 19(12), 690. (doi:10.3390/e19120690)

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Abstract

This paper presents a theoretical investigation of the second law performance of double diffusive forced convection in microreactors with the inclusion of nanofluid and radiation effects. The investigated microreactors consist of a single microchannel, fully filled by a porous medium. The transport of heat and mass are analysed by including the thick walls and a first order, catalytic chemical reaction on the internal surfaces of the microchannel. Two sets of thermal boundary conditions are considered on the external surfaces of the microchannel; (1) constant temperature and (2) constant heat flux boundary condition on the lower wall and convective boundary condition on the upper wall. The local thermal non-equilibrium approach is taken to thermally analyse the porous section of the system. The mass dispersion equation is coupled with the transport of heat in the nanofluid flow through consideration of Soret effect. The problem is analytically solved and illustrations of the temperature fields, Nusselt number, total entropy generation rate and performance evaluation criterion (PEC) are provided. It is shown that the radiation effect tends to modify the thermal behaviour within the porous section of the system. The radiation parameter also reduces the overall temperature of the system. It is further demonstrated that, expectedly, the nanoparticles reduce the temperature of the system and increase the Nusselt number. The total entropy generation rate and consequently PEC shows a strong relation with radiation parameter and volumetric concentration of nanoparticles.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Hunt, Graeme and Karimi, Dr Nader and Govone, Mr Lilian
Authors: Govone, L., Torabi, M., Hunt, G., and Karimi, N.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Entropy
Publisher:MDPI
ISSN:1099-4300
ISSN (Online):1099-4300
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Entropy 19(12):690
Publisher Policy:Reproduced under a Creative Commons License

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