Research on thermal conductivity measurement technology of anisotropic materials

Composite materials have been applied widely because of their special advantages,but due to their anisotropic microstructure,such materials in heat transfer has a macro-anisotropy. The thermodynamic behavior of materials depends on their thermal conductivity to a great extent. So it’s very helpful to reveal the thermal conductivity of materials accurately. For the measurement of thermal conductivity, it can be divided into steady-state method and non-steady-state method according to the different testing principle. At present, the four main measurement methods used for thermal conductivity are plane thermal conductivity method, transient plane source method, transient hot wire method, and laser method. This article introduces and compares the advantages, disadvantages, and applicable scenarios of these four methods from the aspects of working principle, experimental equipment, and measurement accuracy.