A Transient Heating Technique for Measuring Thermal Diffusivities of Metals

Abstract

A transient heating technique that is an improved technique of a constant-rate-heating technique is proposed for thermal diffusivity measurements of metals. An equation used for determining thermal diffusivity of metals is derived, and then a principle of the present technique by a transient heating technique is described. Additionally, an analysis is made to satisfy a condition involved in the principle with the radiative thermal insulation at the end of the spcimen used in this study. To verify the validity of the technique, the thermal diffusivity of iron, whose thermophysical properties have been well known, has been measured with the same apparatus as used in our previous work and the experimental results have been discussed. Moreover the thermal diffusivity of constantan is measured using the present technique.