Symmetrical multi-line transient tropical solid high-heat-conductivity-coefficient testing device

Abstract

The invention relates to the technical field of material heat conductivity coefficient testing, in particular to a device for measuring the heat conductivity coefficient and the thermal diffusion coefficient of a high-heat-conductivity-coefficient solid material. The invention discloses a device for measuring the heat conductivity coefficient and the thermal diffusion coefficient of a large-heat-conductivity-coefficient solid material of a symmetrical multi-wire transient hot-belt heating film, and the device comprises a heating piece which consists of eight heating resistors and consists of multiple wires, a power supply, and a data collection system. The problems that an existing steady-state heat conductivity coefficient testing technology is too long in testing time, an existing transient-state heat conductivity coefficient testing technology is not high in signal-to-noise ratio due to model limitation, and repeatability is poor in the testing process, especially in the testing process of a high-heat-conductivity-coefficient material are solved.

Description

technical field [0001] The invention relates to the technical field of testing material thermal conductivity, in particular to a measuring device for thermal conductivity and thermal diffusivity of solid materials with high thermal conductivity. Background technique [0002] As important physical parameters of matter, material thermal conductivity and thermal diffusivity have important uses in the fields of chemical engineering, materials, energy, power and refrigeration engineering, and are essential basic data in many industrial processes and product designs. With the rapid development of modern industry, the measurement of thermal conductivity and thermal diffusivity of solid materials has been paid more and more attention by people. [0003] The thermal conductivity and thermal diffusivity of substances can be obtained through experimental measurement, theoretical calculation or computer simulation, but at present, experimental measurement is still the main method. Ac...

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Problems solved by technology

[0010] Transient hot zone method, hot wire method and planar heat source method have poor test repeatability due to low signal-to-noise ratio in the test process. This problem is especially prominent in the aspect of large thermal conductivity. In the process of testing materials with large thermal conductivity, the improvement of accuracy is obtained according to the square root of the number of measurements, because the higher the thermal conductivity of the material, the more tests need to be performed, which may be unbearable to the user

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