方形波パルス加熱による低温における熱物性値の測定

概要

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A transient method with pulse heating has been developed to determine the specific heat and thermal conductivity of Bakelite (phenol-formal dehyde resin) in the temperature range of 4.44-9.15K. The temperature excursion in an infinite cylinder with an insulated outer surface and with a cylindrical heat source embedded in it was calculated initially. In the calculation, the heat source released heat as a rectangular-shaped pulse in the time direction. The ratio of the temperature rise at any two time instances was found to be a function only of the Fourier numbers associated to those instances. Therefore, by measuring that ratio, thermal diffusivity was determined while the specific heat could be calculated by the ultimate temperature rise. It was recognized in the temperature range tested that the specific heat and thermal conductivity increased with temperature while the thermal diffusivity decreased with it. The temperature dependence of the specific heat measured is similar to that for Formite Bakelite varnish in the literature.
一般社団法人日本機械学会の論文
1988-09-25