Analytical investigation of heat transfer and classical entropy generation in microreactors - the influences of exothermicity and asymmetry

Hunt, G. , Karimi, N. and Torabi, M. (2017) Analytical investigation of heat transfer and classical entropy generation in microreactors - the influences of exothermicity and asymmetry. Applied Thermal Engineering, 119, pp. 403-424. (doi:10.1016/j.applthermaleng.2017.03.057)

Hunt, G. , Karimi, N. and Torabi, M. (2017) Analytical investigation of heat transfer and classical entropy generation in microreactors - the influences of exothermicity and asymmetry. Applied Thermal Engineering, 119, pp. 403-424. (doi:10.1016/j.applthermaleng.2017.03.057)

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Abstract

Heat transfer and entropy generation are analysed theoretically in a thermal model of microreactors accommodating processes with large heat of reaction. This includes an asymmetric, thick wall, partially-filled porous microchannel under local thermal non-equilibrium. The system features exothermicity/endothermicity within the solid and fluid phases to represent heat of chemical reactions and absorption of microwaves by the microstructure. For constant but uneven temperature boundary condition, analytical solutions are developed for the temperature profiles, Nusselt number (Nu) and local and total entropy generation. The influences of the system configuration and thermal specifications upon the heat transfer and irreversibilities are, subsequently, examined. This reveals the strong effects of the wall thicknesses and thermal asymmetry on the heat transfer and entropy generation of the microreactor. Most importantly, it is shown that for given exothermicities in the system there exist optimal wall and porous insert thicknesses that result in the maximum Nu and minimum total entropy generation. The presented analyses are therefore of practical significance and demonstrate the possibility of developing thermal and entropic optimal designs of the microstructure of microreactors.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Hunt, Graeme and Karimi, Dr Nader
Authors: Hunt, G., Karimi, N., and Torabi, M.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Applied Thermal Engineering
Publisher:Elsevier
ISSN:1359-4311
ISSN (Online):1359-4311
Published Online:14 March 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Applied Thermal Engineering 119: 403-424
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
679091QT-EPSRC: QT DemonstratorGiles HammondEngineering & Physical Sciences Research Council (EPSRC)EP/M506539/1S&E P&A - PHYSICS & ASTRONOMY