Thermal Conductivity and Thermal Diffusivity Measurements of Salt Rocks by Different Methods
Thermal conductivity measurements are being performed on a large number of drill core samples from the boreholes for exploration of the Gorleben salt dome for nuclear waste disposal. A laboratory instrument for rapid thermal conductivity determination based on the familiar heat-flow-meter method (ASTM C518) is used for this purpose. Thermal conductivity data for selected samples from these measurements have been compared with measurements on the same samples by a comparative method under steady state longitudinal heat flow conditions. In addition, thermal diffusivity measurements were made. The comparison of the different methods was made with respect to accuracy, reproducibilty and possible measurement errors. Special emphasis was given to the thermal contact resistance within the experimental set-up.
KeywordsHeat Flow Rock Salt Thermal Contact Resistance Thermal Conductivity Measurement Thermal Diffusivity Measurement
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