The thermal conductivity refers to a material with a thickness of 1 m under stable heat transfer conditions. The temperature difference between the two sides is 1 degree (K, ° C). In 1 second (1 s), the heat transferred through the area of ​​1 square meter is in watts. /m·degree (W/(m·K), where K can be replaced by °C).
The thermal conductivity is only for heat transfer forms where there is heat transfer. When there are other forms of heat transfer, such as radiation, convection and mass transfer, the heat transfer relationship is often called apparent heat transfer. Coefficient, dominant thermal conductivity or thermal transmissivity of material.
In addition, the thermal conductivity is for homogeneous materials. In reality, there are porous, multi-layer, multi-structure, anisotropic materials. The thermal conductivity obtained by this material is actually a performance of comprehensive thermal conductivity. Also known as the average thermal conductivity.
Transient planar heat source technology (TPS) is a new method for measuring thermal conductivity, developed by Professor Silas Gustafsson of the University of Technology, Chalmer, Sweden. Its principle of determining the thermal properties of a material is based on the transient temperature response produced by a step-heated disk-shaped heat source in an infinite medium. A flat probe is made of a thermally resistive material, and serves as both a heat source and a temperature sensor. The thermal resistance coefficient of the alloy has a linear relationship with the relationship between temperature and resistance. That is, the heat loss can be known by understanding the change of the resistance, thereby reflecting the thermal conductivity of the sample. The probe of the method is a continuous double-helical structure sheet formed by etching after using a conductive alloy, and the outer layer is a double-layer insulating protective layer, and the thickness is very thin, so that the probe has a certain mechanical strength and remains between the sample and the sample. Electrical insulation. During the test, the probe was placed in the middle of the sample for testing. When the current passes through the probe, a certain temperature rise occurs, and the generated heat is simultaneously diffused to the samples on both sides of the probe. The speed of thermal diffusion depends on the heat transfer characteristics of the material. The thermal conductivity can be directly obtained from the mathematical model by recording the temperature and the response time of the probe.
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