System and method for testing thermal diffusion coefficient of orthotropic solid material

Abstract

The invention relates to the technical field of material thermophysical parameter testing, and discloses a system and a method for testing thermal diffusion coefficient of orthotropic solid material. The system comprises a testing sample, a constant-temperature water bath box, a sample fixing device and a data acquisition system. The constant-temperature water bath box comprises a water bath box body, a water bath box cover and a water bath box controller, the sample fixing device comprises a fixing cover, an adjusting bolt, a fixing cross, a graphene sticker, a heat insulation material and a heat-resistant rubber band, and the data acquisition system comprises a thermocouple, an A / D converter, a stabilized voltage supply, a USB-to-RS485 communication converter and a notebook computer. On the basis of an unsteady-state heat conduction product method, a sample constant-temperature boundary is constructed by utilizing a constant-temperature water bath and a graphene sticker, a sample heat-insulating boundary is constructed by utilizing a heat-insulating material, a three-dimensional orthogonal unsteady-state heat transfer model is established, and the first six items of the series are combined with a random conjugate gradient method; and simultaneous inversion of the thermal diffusion coefficients of the orthotropic solid material in the x, y and z directions is realized.

Description

Technical field [0001] The present invention belongs to the technical field of material heat quality parameter test, and in particular, the present invention relates to a thermal diffusion coefficient test system and method for orthogonal anisotropic solid material. Background technique [0002] The thermal diffusion coefficients as one of the important thermophysical properties of the solid material, characterizing the ability of the objects during the heating or cooling process, is an important basis for evaluating and calculating material heat transfer performance; and chemical, energy , Power engineering and other fields have important uses, which are essential in many industrial processes and product design. According to the principle of thermal diffusion coefficient measurement, its measurement method can be roughly divided into a steady state method and a non-stable state method. Among them, the non-organism method is widely adopted due to short measurement time, and the m...

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Problems solved by technology

[0003] At present, the research on the non-steady-state measurement methods of the thermal diffusivity of isotropic materials has been in-depth, but there are still some difficulties in using these methods to measure the thermal diffusivity of orthotropic solid materials

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