Precise Measurement of Thermophysical Properties of Solids by a Direct Electrical Heating Method : 1st Report, Measurement and Theoretical Evaluation of Accuracy for a Circular Rod Sample

Abstract

An improvement of the principle for measuring thermophysical properties by the direct heating method has been done. In this report, an improved method for measuring thermal conductivity, k, and total hemispherical emittance, ε, is presented. Theoretical evaluations of accuracy in these measurements using a circular rod sample are also conducted. From the results of experiments on silver (99.99% pure), it becomes clear that this is an advantageous method for measuring precise thermophysical properties, such as k andε, of an electrically conductive solid. The results of analysis have been verified by those of experiments. By using the theoretical evaluation of accuracy, the optimum sample size can be determined.