Transient Comparison Methods of Simultaneous Measurement of Thermal Properties

Abstract

Transient comparison methods of simultaneous determination of thermal conductivity, thermal diffusivity and heat capacity with a plane-shaped standard sample are investigated. Series method and parallel method are proposed concerning the arrangment of the standard sample and the sample to be measured. Measuring method and necessary conditions of measurement are discussed, and the merits of the above two methods are revealed : Series comparison method is a very simple measuring method applicable to solids, powders and liquids, and the parallel comparison method is suitable for the precise measurement of relative properties among solids of resembling properties. Experimental results for plastics and spindle oil showed that the same accuracy with the transient absolute measurement could be obtained by these transient comparison methods.