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Evaluation of anisotropic tangential conduction in printed-circuit-board heated-thin-foil heat flux sensors

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dc.affiliation.dptoUC3M. Departamento de Ingeniería Aeroespaciales
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Ingeniería Aeroespaciales
dc.contributor.authorTorre Fernández, Margarita
dc.contributor.authorIaniro, Andrea
dc.contributor.authorDiscetti, Stefano
dc.contributor.authorCarlomagno, G.M.
dc.contributor.funderMinisterio de Ciencia, Innovación y Universidades (España)es
dc.date.accessioned2021-05-11T09:04:27Z
dc.date.available2021-05-11T09:04:27Z
dc.date.issued2018-12
dc.description.abstractThe effect of the tangential conduction contribution in a thermally anisotropic heated-thin-foil heat flux sensor is examined. A parameter to assess the degree of importance of tangential conduction in the sensor is defined and evaluated in order to justify the need of tangential conduction corrections. Printed circuit boards (PCBs) are typical examples of sensors with anisotropic thermal conduction properties, due to the different conductance values in the directions either parallel or orthogonal to the copper tracks which are placed onto a fiberglass substrate. A parametric study on PCBs with different tracks coverage fraction and copper-to-fiberglass heat conductance ratio is carried out. A revised heated-thin-foil formulation, including a correction for anisotropic thermal properties of the PCB, is experimentally tested. The selected thermo-fluid-dynamic test case is the convective heat transfer of a normally impinging round jet for which axisymmetric maps of the Nusselt number are expected. The anisotropic tangential conduction results in non-axisymmetric temperature distributions. Consequently, if anisotropy is not properly accounted for, non-axisymmetric Nusselt number maps are obtained. The anisotropic conduction effects are shown to be weakly sensitive to the copper tracks coverage fraction while strongly dependent on a parameter called degree of anisotropy, which accounts for the copper-to-fiberglass heat-conductance ratio. Anisotropic conduction effects are found to be almost negligible in PCBs with low values of the degree of anisotropy and/or low values of the tangential conduction degree of importance. Accounting for the anisotropic tangential conduction in the heated-thin-foil formulation allows minimizing the differences between the Nusselt number profiles measured in the directions parallel and orthogonal to the copper tracks.en
dc.format.extent9
dc.identifier.bibliographicCitationTorre, A., Ianiro, A., Discetti, S. & Carlomagno, G. (2018). Evaluation of anisotropic tangential conduction in printed-circuit-board heated-thin-foil heat flux sensors. International Journal of Heat and Mass Transfer, vol. 127-A, pp. 1138–1146.en
dc.identifier.doihttps://doi.org/10.1016/j.ijheatmasstransfer.2018.06.106
dc.identifier.issn0017-9310
dc.identifier.publicationfirstpage1138
dc.identifier.publicationlastpage1146
dc.identifier.publicationtitleInternational Journal of Heat and Mass Transferen
dc.identifier.publicationvolume127-A
dc.identifier.urihttps://hdl.handle.net/10016/32585
dc.identifier.uxxiAR/0000022239
dc.language.isoeng
dc.publisherElsevier
dc.relation.projectIDGobierno de España. DPI2016-79401-Res
dc.rights© 2018 Elsevier Ltd.
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.accessRightsopen access
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subject.ecienciaIngeniería Mecánicaes
dc.subject.otherConvective heat transferen
dc.subject.otherHeat-flux sensorsen
dc.subject.otherHeated thin foilen
dc.subject.otherPrinted circuit boarden
dc.titleEvaluation of anisotropic tangential conduction in printed-circuit-board heated-thin-foil heat flux sensorsen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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