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dc.contributor.authorMiettinen, Lasse
dc.date.accessioned2012-01-12T10:31:38Z
dc.date.available2012-01-12T10:31:38Z
dc.date.issued2011
dc.identifier.isbn978-951-39-4580-0
dc.identifier.otheroai:jykdok.linneanet.fi:1191956
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/37196
dc.description.abstractMethods for determining the in-plane thermal diffusivity in a planar sample geometry were developed. These methods were tested and verified by measuring planar metal samples with known thermal properties. The techniques used were based on heating the sample at one edge and recording the evolution of the temperature field in the sample by a thermographic camera. The temperature fields at different times were processed and then fitted by a solution to a heat equation describing the experimental setup, thermal diffusivity as one of the fitting parameters. In the first experimental setup the sample was placed in a weak constant flow of air, and the situation was improved in the second setup by placing the sample in a vacuum chamber, where convective heat transfer was totally removed. After verification measurements, the latter setup was applied to porous sintered bronze samples, and their effective thermal conductivities were determined. The sintered samples were also imaged by X-ray microtomography so as to obtain a 3D model for their structure. It was shown that the effective thermal conductivity of the samples could be predicted by an analytical expression which involved certain parameters determined from the 3D images. Finally, as another application of the heat equation, propagation of temperature profiles in the form of slow-combustion fronts were studied in sheets of paper. The dynamical properties of these fronts belong to the KPZ universality class, for which theoretical results are available for the height-fluctuation distributions. Height fluctuations for such fronts were determined experimentally, and their distributions were found to be well fitted by corresponding theoretical distributions.fi
dc.format.extentverkkoaineisto (64 sivua).
dc.language.isoeng
dc.publisherUniversity of Jyväskylä
dc.relation.ispartofseriesResearch report / Department of Physics, University of Jyväskylä
dc.relation.isversionofISBN 978-951-39-4579-4
dc.subject.otherthermal diffusivity
dc.subject.otherthermal conductivity
dc.subject.otherthermography
dc.subject.otherslow combustion
dc.subject.otherKPZ equation
dc.subject.otherheight fluctuations
dc.titleIn-plane conductive heat tansfer in solid and porous planar structures
dc.typeDiss.
dc.identifier.urnURN:ISBN:978-951-39-4580-0
dc.type.dcmitypeTexten
dc.type.ontasotVäitöskirjafi
dc.type.ontasotDoctoral dissertationen
dc.contributor.tiedekuntaMatemaattis-luonnontieteellinen tiedekuntafi
dc.contributor.tiedekuntaFaculty of Mathematics and Scienceen
dc.contributor.yliopistoUniversity of Jyväskyläen
dc.contributor.yliopistoJyväskylän yliopistofi
dc.contributor.oppiaineFysiikkafi
dc.relation.issn0075-465X
dc.relation.numberinseriesno. 11/2011
dc.rights.accesslevelopenAccessfi
dc.subject.ysolämpökamerat
dc.subject.ysolämmön johtuminen
dc.subject.ysolämmön siirtyminen
dc.subject.ysodiffuusio


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