Measurement of thermophysical properties of solid materials by hot wire method combined with enantiomorphous heat-source theory
Qinghua Chen, Wei Gao, Guoyong Su, Weijuan Guan, Shang Xu, Melangimomo Valex and Yangbin Ma
At present, the thermophysical properties testing methods of solid materials are mostly based on infinite physical model. In order to ensure that the heat flux transmits within the sample and is not affected by the heat loss at the sample boundary, its boundary is usually set as an adiabatic boundary. Nevertheless, it will lead to the accumulation of heat. In order to achieve the hot wire method conveniently, solid material for which a thinner thickness can be measured and the effective test time of the experiment is flexible. By so doing, we improved the traditional parallel hot wire method. The temperature measuring points were arranged along the thickness direction of the sample instead of parallel to the hot wire, and the enantiomorphous heat-source theory was introduced to modify the effect of heat accumulation on the temperature rise of the sample. The thermophysical property of diatomite refractory brick, asbestos board and marble were measured. The results show that the revised calculated values are in good agreement with the existing test values, with a maximum error of 5%, effectively expanding the application range of the hot wire method.
Keywords: Solid material, Thermophysical parameters, Hot wire method, Enantiomorphous heat-source, Non-contact measurement, Measurement system