An apparatus has been cnstructed for precise and absolute measurement of the thermal conductivity of molten salts at high temperatures. The principle of the measurement is based on the absolute transient hot-wire method. In order to apply this method to molten salts, the entire probe has to be insulated. After many trials of insulation techniques applied on probes, it has been confirmed that the following probe is the most suitable for the present purpose: platinum thin wire coated with Si02 prepared by metal alkoxide hydrolysis process, and titanium leads insulated by plasma sprayed Al2O3 with SiO2 upper coating. The usability of the probe has been tested by measuring the thermal conductivity of molten KNO3in the temperature range from 350 to 390°C. The accuracy of the present measurement is estimated to be ±2%.
|Transactions of the Japan Society of Mechanical Engineers Series B
|Published - 1986
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