Thermal Conductivity Measurement Of Insulating Materials Up To 1000 Degrees C With A Needle Probe
REVIEW OF SCIENTIFIC INSTRUMENTS(2021)
摘要
The hot wire method is one of the few methods that can be applied to measure the thermal conductivity of materials at 1000 degrees C and above. However, in the case of granular or electrically conductive materials, the heating wire and thermocouple must be insulated from the material by placing them in a sheath (or a needle). In this case, it is shown that the method of using the slope of the curve T = f[ln(t)] could lead to estimation errors of up to 30% for some materials. A complete quadrupolar model of the system needle/material is developed, and a sensitivity analysis of the probe temperature to the different parameters allowed for the selection of a reduced model, enabling a precise estimation of the thermal conductivity. Measurements carried out between 600 and 1000 degrees C on a material of known thermal conductivity led to deviations of less than 3%. The method is finally applied up to 1000 degrees C to two granular materials and to compacted molding sand with quite a good fitting between the experimental and modeled curves. Published under an exclusive license by AIP Publishing.
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