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dc.contributor.authorHabib, Ren_US
dc.contributor.authorYadollahi, Ben_US
dc.contributor.authorKarimi, Nen_US
dc.contributor.authorDoranegard, MHen_US
dc.date.accessioned2020-06-17T14:34:24Z
dc.date.issued2020-05-25en_US
dc.identifier.issn0735-1933en_US
dc.identifier.urihttps://qmro.qmul.ac.uk/xmlui/handle/123456789/65053
dc.description.abstractHeat convection response of a porous medium to the harmonic disturbances in the inlet flow is investigated in a configuration consisting of several obstacles. Navier Stokes and energy equations are solved computationally and the average Nusselt number around the obstacles is favourably compared against the existing empirical data. The Nusselt number fluctuations are then examined, revealing that the dynamical relations between the inlet flow fluctuations as the input and those of Nusselt number as the output, can be nonlinear. The extent of encountered nonlinearity is determined quantitatively through introduction of a measure of nonlinearity. It is shown that increases in the pore-scale Reynolds number can strengthen the nonlinearity. However, this is not a global trend and further increases in Reynolds number may push the system dynamics back to linear. Application of the concept of transfer function to the identified linear cases reveals that the frequency response of the Nusselt number closely resembles a classical low-pass filter. Further, through a statistical analysis, it is shown that thermal response of the porous medium is strongly dominated by those of the first few obstacles. This highlights the importance of taking pore-scale approach in the dynamical problems that involve heat convection in porous media.en_US
dc.publisherElsevieren_US
dc.relation.ispartofInternational Communications in Heat and Mass Transferen_US
dc.rights© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
dc.rightsAttribution 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/*
dc.titleOn the unsteady forced convection in porous media subject to inlet flow disturbances-A pore-scale analysisen_US
dc.typeArticle
dc.rights.holder© 2020 The Authors. Published by Elsevier Ltd.
dc.identifier.doi10.1016/j.icheatmasstransfer.2020.104639en_US
pubs.notesNot knownen_US
pubs.publication-statusPublisheden_US
pubs.volume116en_US
rioxxterms.funderDefault funderen_US
rioxxterms.identifier.projectDefault projecten_US
rioxxterms.funder.project483cf8e1-88a1-4b8b-aecb-8402672d45f8en_US


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© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Except where otherwise noted, this item's license is described as © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.