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Effects of nanofluid and radiative heat transfer on the double-diffusive forced convection in microreactors

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journal contribution
posted on 10.05.2021, 10:36 by Lilian Govone, Mohsen Torabi, LINWEI Wang, Nader Karimi
Understanding transport phenomena in microreactors remains challenging owing to the peculiar transfer features of microstructure devices and their interactions with chemistry. This paper, therefore, theoretically investigates heat and mass transfer in microreactors consisting of porous microchannels with thick walls, typical of real microreactors. To analyse the porous section of the microchannel the local thermal non-equilibrium model of thermal transport in porous media is employed. A first order, catalytic chemical reaction is implemented on the internal walls of the microchannel to establish the mass transfer boundary conditions. The effects of thermal radiation and nanofluid flow within the microreactor are then included within the governing equations. Further, the species concentration fields are coupled with that of the nanofluid temperature through considering the Soret effect. A semi-analytical methodology is used to tackle the resultant mathematical model with two different thermal boundary conditions. Temperature and species concentration fields as well as Nusselt number for the hot wall are reported versus various parameters such as porosity, radiation parameter and volumetric concentration of nanoparticles. The results show that radiative heat transfer imparts noticeable effects upon the temperature fields and consequently Nusselt number of the system. Importantly, it is observed that the radiation effects can lead to the development of a bifurcation in the nanofluid and porous solid phases and significantly influence the concentration field. This highlights the importance of including thermal radiation in thermo-chemical simulations of microreactors.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of Thermal Analysis and Calorimetry

Volume

135

Pages

45 - 59

Publisher

Springer Science and Business Media LLC

Version

AM (Accepted Manuscript)

Rights holder

© Springer

Publisher statement

This is a post-peer-review, pre-copyedit version of an article published in Journal of Thermal Analysis and Calorimetry. The final authenticated version is available online at: https://doi.org/10.1007/s10973-018-7027-z

Acceptance date

18/01/2018

Publication date

2018-01-25

Copyright date

2019

ISSN

1388-6150

eISSN

1572-8943

Language

en

Depositor

Dr LINWEI Wang. Deposit date: 7 May 2021