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Heat-conducting property steady-state test method for sheet materials

A test method and thin sheet technology, applied in the direction of material thermal conductivity, material thermal expansion coefficient, etc., can solve the problems of low total heat flow power, difficult to ensure heat flow uniformity and continuity, poor test accuracy and repeatability, etc., to reduce the surface area. Effects of heat loss, improved stability and repeatability, improved accuracy

Active Publication Date: 2018-07-20
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the surface thermal conductivity test of sheet materials, due to the small size of the sample in the thickness direction, the total power of the heat flow through the heat transfer section is very small when facing the heat transfer, and the surface heat loss has a great impact on the test. The uniformity and continuity of the heat flow in the sample It is difficult to guarantee the accuracy, resulting in poor test accuracy and repeatability

Method used

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  • Heat-conducting property steady-state test method for sheet materials
  • Heat-conducting property steady-state test method for sheet materials
  • Heat-conducting property steady-state test method for sheet materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] The cross-sectional structure of the test system is as follows: figure 1 As shown: the electric heating device 1 locally heats the middle part of the thin slice 3 to be tested with a constant power through the heat conducting column 2, and the heat flows to the heat sink 5 through the heat conducting ring seat 4; the surroundings of the electric heating device 1 and the heat conducting column 2, and the thin slice 3 The lower part is filled with heat-insulating material 6; the thermal imager 7 is facing the sheet 3 to be tested; the main body of the test device is located in the thermostat 8, and the temperature sensor 9 measures the temperature of the thermostat.

[0028] The surface area of ​​the sample is divided into figure 2 As shown: the heating area 10 is located in the middle of the sample, the test area 11 surrounds the heating area, and the heat dissipation area 12 is located on the outermost side; both the heating area 10 and the heat dissipation area 12 hav...

Embodiment approach 2

[0046] The cross-sectional structure of the test system is as follows: image 3 As shown: the main electric heating device 1 locally heats the middle part of the thin slice 3 to be tested with a constant power through the main heating column 2, and the heat flows to the heat sink 9 through the heat conducting ring seat 4; symmetrically, the reference electric heating device 5 passes through the reference heat conducting column 6 pair The reference sheet 7 is locally heated with a constant power, and the heat flows through the heat conduction ring seat 8 to the heat sink 9; around the main electric heating device 1 and the main heat column 2, the lower part of the sheet 3 to be measured, the reference electric heating device 5 and the reference heat conduction The surroundings of the column 6 and the lower part of the reference sheet 7 are filled with heat insulating material 10; the thermal imager 11 is installed on a one-dimensional translation platform 12, and can move back a...

Embodiment approach 3

[0064] The cross-sectional structure of the test system is as follows: Figure 5 As shown: the sheet 3 to be tested is arranged on the heat conducting ring seat 4, and the laser light emitting part 1 is fixed on the two-dimensional electric displacement table 2, which can emit a circular spot laser with a diameter of 2 mm at a constant power and project it on the lower surface of the sheet 3 to be tested; After the test sheet is heated, the heat flows through the heat conduction ring seat 4 to the heat sink 5; the thermal imager 6 is located directly above the test sheet 3; the main body of the test device is located in the thermostat 7, and the temperature sensor 8 measures the temperature of the thermostat.

[0065] The surface thermal conductivity of the thin slice 3 to be tested is unevenly distributed. According to the resolution, the surface needs to be divided into a series of non-overlapping single-connected regions, such as equidistant grids, or properly adjusted accor...

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Abstract

The invention discloses a heat-conducting property steady-state test method for sheet test samples. A sheet sample is locally heated to a thermal equilibrium state, and then, the heat conductivity coefficient is calculated according to the integral of temperature gradient on a heat transfer section. The method has the characteristics that heat flow uniformity is not required, small areas of sheetsamples can be tested, the surface heat loss power is lower, and effects of surface heat dissipation on the test accuracy of heat conductivity coefficient are reduced. Meanwhile, the apparent heat conductivity coefficient of sheets in a small range is represented with the method, so that quantitative evaluation of spatial distribution of the heat conductivity coefficients of non-uniform sheets canbe obtained by changing test areas. On the basis of the same idea, the method can be applicable to sheet materials with heat conducting anisotropy after being slightly modified.

Description

technical field [0001] The present invention relates to a method for testing the thermal conductivity of materials, more specifically a method for testing the steady-state thermal conductivity of thin-sheet test samples, and can be applied to materials with uniform or non-uniform, isotropic or anisotropic thermal conductivity Flakes. Background technique [0002] The thermal conductivity of materials is crucial to thermal design. Accurate testing of thermal conductivity of materials is the basis of system design and the basis of production quality control. The thermal conductivity of materials is generally expressed by thermal conductivity, and in a few cases, it is also characterized by thermal diffusivity parameters. In the case of known density and specific heat capacity, knowing one of the two can calculate the other. [0003] There are currently many methods and standards for thermal conductivity testing, but most of these methods are aimed at traditional materials, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/18G01N25/16
CPCG01N25/16G01N25/18
Inventor 侯德鑫叶树亮
Owner CHINA JILIANG UNIV
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