Measurement of Thermophysical Properties of Solids by Arbitrary Heating : 1st report, Measurement of Thermal Diffusivity of Flat Plate Specimen

概要

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A method for the measurement of the thermal diffusivity of a flat plate specimen is presented. In contrast with other traditional methods, the method permits the measurement to be conducted under arbitrary boundary conditions; namely, arbitrary heating and radiating conditions. The method utilizes a general solution of the Laplace transformed heat conduction equation and the Laplace integrals of temperature responses detected at three different positions in the specimen. The numerical tests are carried out to confirm the nature of the method, to verify the method and to evaluate the measuring errors. The Laplace parameter s is shown freely determinable when the product of s by the measuring time t_<max> satisfies the following relation : 8 ≦ st_<max>≦ 12. The measured thermal diffusivities of polymethylmethacrylate and soda glass are shown to be in good agreement with the reference data.
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