Abstract
The principle of thermal conductivity measurements as illustrated by the transient hot wire method is based on the assumption that thermal properties of a medium are constant, independent of temperature. However, since the thermal conductivity of the medium usually changes with temperature, the temperature rise during the measurement is a source of error. In this study, the theory of thermal conductivity measurements for such a nonlinear medium using the transient hot wire method is investigated analytically, and is compared with conventional theory for a constant conductivity medium. Furthermore, experiments are performed for a medium with a comparatively large temperature coefficient of thermal conductivity and are compared with the theory for the nonlinear medium.
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