Evaluation of thermal conductivity from temperature profiles
Year: 1993
Authors: Bussolino GC., Spisiak J., Righini F., Cresto P.C., Roberts R.B., Rosso A.
Autors Affiliation: CNR Istituto di Metrologia
Abstract: A new dynamic technique for the measurement of thermal conductivity is being developed at IMGC. The experiment consists in bringing the specimen to high temperatures with a current pulse and in measuring the temperature profiles during the free cooling period. Different techniques can be used to extract the information on thermal conductivity from the profiles. The numerical computation of thermal conductivity from the experimental temperature profiles in absolute space is possible, but it is difficult and cumbersome because one must know and take into the account the exact position of the infinitesimal elements of the specimen in different profiles. Computations in tube-space (a fictitious space where no thermal expansion occurs) are simpler and lead to less complex numerical computations. Complementary techniques to evaluate thermal conductivity as a function of temperature or at constant temperature are presented with a discussion of advantages and disadvantages of each method. Computer simulations have tested the precision of the complex software. Numerically generated temperature profiles from known thermophysical properties have been obtained and thermal conductivity has been recomputed from the profiles. The relative difference using different computational approaches and different fitting functions is always less than 0.1 %.
Journal/Review: INTERNATIONAL JOURNAL OF THERMOPHYSICS
Volume: 14 (3) Pages from: 525 to: 539
KeyWords: dynamic measurements; high temperature; scanning pyrometry; temperature profiles; thermal conductivityDOI: 10.1007/BF00566050Citations: 2data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-04-21References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here