The Determination of Thermal Diffusivities of Thermal Energy Storage Materials, Part I: Solids up to Melting Point

Abstract

ABSTRACT-- ' .This paper describes a method for the determination of thermal diffusivities which has been developed specifically for substances which are poor conductors, and which have high melting points, Materials which are useful for thermal energy storage fall into this category.The method has several unique features, The basic principle involved consists of raising the surface temperature of a solid specimen at a uniform rate, After the initial transients have died out, the diffuefvity can be determined from temperature measurements alone.The advantages of the method are: 1, Heat flw measurements are not needed.2. Materials can be tested right up to the melting point since the specimens can be encapsulated and softening can be tolerated.. . 3,Large temperature ranges can be tested quickly. Data on other substances are still being produced, and results will be published at a later date.

Application of the laser pulse method of measuring thermal diffusivity to thin alumina and silicon samples in a wide temperature range

“…Com par i son of these re sults with other lit er a ture data [5][6][7][8][9][10] is given in fig. 2.…”