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The hot-wire technique has been used to measure the thermal conductivity of many electrically and thermally insulating materials and the effective thermal conductivity of some diathermanous materials. An analysis of the heat transfer in diathermanous materials is presented which indicates that the method will not give a correct value of the effective thermal conductivity when radiation conduction is of importance. Until an exact solution to this heat-transfer problem is found, an ASTM standard for hot-wire type measurements on diathermanous materials is not recommended.
thermal conductivity, hot-wire technique, diathermanous materials
Assistant professor, University of Kentucky, Lexington, Ky.