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Abstract: For the prediction of thermal conductivity using theoretical models of a composite or mixture of components, the thermal conductivities of the individual components must be known. In this study, the needle probe method was used to measure the thermal conductivity of a mixture of powder and fluid, and using the law of mixtures (Hashin-Shtrikman bounds) the thermal conductivity of the solid phase is estimated. A much simpler method exists though for the measurement of thermal conductivity: the transient plane source (TPS) technique. The authors use this technique for the measurement of thermal conductivity and thermal diffusivity of samples of quartz, calcite and kaolinite which are well-known minerals. Using a combination of the theoretical and experimental methods detailed above, the authors further measured the thermal conductivity and diffusivity of a sample of cement made up of a variety of different materials.

Reference: Journal of Physics D: Applied Physics, 30, 20 (1997) 2900

DOI: 10.1088/0022-3727/30/20/018