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Anisotropic material heat conductivity measurement method and apparatus based on hotwire method

A technology of anisotropy and measurement method, applied in the field of thermal conductivity measurement of anisotropic materials based on the hot wire method, can solve the problems of complex equipment, cumbersome methods, long test period, etc., and achieve simple equipment, simplified measurement, The effect of shortening the test cycle

Active Publication Date: 2017-11-07
TONGJI UNIV
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Problems solved by technology

Therefore, the traditional hot wire method is mainly used in the measurement of thermal conductivity of isotropic materials, but it cannot be directly used in the measurement of anisotropic materials; for the measurement of thermal conductivity of anisotropic materials, in the past, only complex equipment, Hot plate method with cumbersome method and long test period

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  • Anisotropic material heat conductivity measurement method and apparatus based on hotwire method
  • Anisotropic material heat conductivity measurement method and apparatus based on hotwire method
  • Anisotropic material heat conductivity measurement method and apparatus based on hotwire method

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Embodiment

[0023] see figure 1 To Fig. 3, the method for measuring thermal conductivity of anisotropic material of the present invention comprises the following steps:

[0024] 1. Establish the mathematical relationship between the real thermal conductivity of anisotropic materials in the three main directions and the nominal thermal conductivity in the three main planes measured by the hot wire method;

[0025] 2. Measure the thermal conductivity of anisotropic materials based on the hot wire method.

[0026] details as follows:

[0027] 1. Establish the mathematical relationship between the real thermal conductivity of anisotropic materials in the three main directions and the nominal thermal conductivity in the three main planes measured by the hot wire method ( figure 1 ):

[0028]

[0029] Solve to get:

[0030] In the formula: k x ,k y ,k z are the real thermal conductivity of the anisotropic material in the three main axis directions x, y, z; k N1 ,k N2 ,k N3 are th...

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Abstract

The invention relates to an anisotropic material heat conductivity measurement method based on a hotwire method. The anisotropic material heat conductivity measurement method comprises the following steps: S1, acquiring a rectangular anisotropic material test sample; S2, building an xyz coordinate system with a length, a width and a height of a cuboid, testing nominal heat conductivity kN1, kN2 and kN3 of three planes N1, N2 and N3 by utilizing a hotwire method, wherein the three planes N1, N2 and N3 are respectively perpendicular to an axis x, an axis y and an axis z; and S3, calculating real heat conductivity kx, ky and kz on the axis x, axis y and axis z according to the following formula: (the formula is shown in the description). Compared with the prior art, the anisotropic material heat conductivity measurement method and apparatus have the advantages that the instruments and devices of the hotwire method are simple and portable, and can simplify the measurement and shorten the test period.

Description

technical field [0001] The invention relates to a method for measuring thermal conductivity of materials, in particular to a method and device for measuring thermal conductivity of anisotropic materials based on a hot wire method. Background technique [0002] Thermal conductivity is a basic characteristic parameter of materials. Currently, the commonly used measurement methods are mainly transient hot wire method (also called "thermal probe method") and steady-state hot plate method. The hot wire method has the advantages of portable testing equipment and simple and fast measurement methods. Its principle is to determine the thermal conductivity of the material in a plane perpendicular to the probe by measuring the magnitude and speed of temperature change caused by heat spreading along the linear thermal probe to the surroundings. Therefore, the traditional hot wire method is mainly used in the measurement of thermal conductivity of isotropic materials, but it cannot be d...

Claims

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Application Information

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IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 陈宝黄依艺张康
Owner TONGJI UNIV
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