An accuracy analysis of the thermal diffusivity measurement of molten salts by stepwise heating and improved apparatus

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Abstract
The stepwise heating method for measuring thermal diffusivity of molten salts is based on the electrical heating of a thin metal plate as a plane heat source in the molten salt. In this method, it is important to estimate the errors due to the following: (i) the finite plate thickness and (ii) the determination of the effective distance between the plate and the point at which the temperature is being measured. Both have great influence on the accuracy of the measurement. An improved apparatus is described and adequate measuring conditions are suggested on the basis of error estimations. The measurements for distilled water and glycerine were made first and the results agreed well with standard values. The thermal diffusivities of molten NaNO3 at 320-80 degrees C and of molten Li2BeF4 at 470-700 degrees C were measured.

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