Deviations from one-dimensional heat flow in guarded hot- plate measurements

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AuthorSearch for:
TypeArticle
Journal titleReview of Scientific Instruments
ISSN0034-6748
Volume28
Issue12
Pages10331037; # of pages: 5
Subjectheat meters; heat transfer; thermal conductivity
AbstractA theoretical analysis is made of the error in thermal conductivity, measured by the guarded hot-plate apparatus, resulting from a temperature difference, or unbalance, between the test area and guard ring. The solution is obtained by the application of two successive Schwarz transformations, the assumptions having been verified by relaxation calculations. An expression is derived for the error heat flow in the test specimens. The agreement between calculated and measured values of the error heat flow for three different hot plates for which experimental data are available is 5% or better. It is therefore now possible to calculate the maximum tolerable unbalance to achieve any desired accuracy in thermal conductivity measured by the guarded hot plate.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
IdentifierDBR-RP-50
NRC number4560
247
NPARC number20374165
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Record identifier9443872e-638f-4609-b314-9e93a8b44a44
Record created2012-07-23
Record modified2016-05-09
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