An apparatus for noncontact measurement of thermal conductivity by thermal radiation heating |
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Authors: | K. Hisano |
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Affiliation: | (1) Department of Mathematics and Physics, National Defense Academy, Hashirimizu 1-10-20, 239 Yokosuka, Japan |
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Abstract: | Thermal radiation calorimetry was applied to measure the thermal conductivity of insulating solid specimens. We consider the system in which a disk-shaped specimen and a flat heater are mounted in a vacuum chamber with the specimen heated on one face by irradiation. A temperature difference between two faces was observed at elevated temperatures under steady-state conditions. An apparatus was developed using a thin graphite sheet as the heater element. Disk-shaped Pyrex glass and Pyroceram specimens, whose surfaces were blackened with colloidal graphite, were used in the measurements. Noncontact temperature measurement was performed using pyrometers and a thermocouple set in the gap between the heater and the specimen. Deviations of the estimated thermal conductivities from the recommended values were about 5% in the temperature range 250 to 800°C. Paper presented at the Fourth Asian Thermophysical Properties Conference, September 5–8, 1995, Tokyo, Japan. |
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Keywords: | high temperature noncontact measurement thermal conductivity thermal radiation |
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