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Method and system for testing thermal diffusion coefficient of solid material

A technology of thermal diffusivity and solid material, which is applied in the field of material thermal property parameter testing, can solve the problems of radial heat flow method heat source uniformity, power fluctuation lateral heat flow loss is not well solved, and contact thermal resistance is difficult to achieve. Guaranteed test accuracy and good temperature uniformity

Active Publication Date: 2014-07-30
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

However, there are still some problems in practical applications. For example, the flash method can only be applied to opaque materials, and the radial heat flow method has not been well resolved in terms of heat source uniformity, power fluctuation, and lateral heat flow loss. The method of solid heat source is still difficult to characterize the contact thermal resistance between the heat source and the measured object

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  • Method and system for testing thermal diffusion coefficient of solid material
  • Method and system for testing thermal diffusion coefficient of solid material
  • Method and system for testing thermal diffusion coefficient of solid material

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Embodiment Construction

[0026] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0027] Such as figure 1 As shown, the flat sample 1, the initial temperature is t 0 , Its one side suddenly and the temperature is t ∞ The other side is in contact with the fluid, and the other side is adiabatic. If the lateral heat transfer is not considered, the heat transfer between the fluid and the solid surface can be regarded as a one-dimensional unsteady heat transfer process under the third type of boundary conditions. The analytical solution is as follows:

[0028] θ ( x , τ ) θ 0 = X n = 1 ∞ 2 sin β n β n + sin β n cos β n cos ( β n x δ ) e - β n 2 Fo - - - ( 1 )

[0029] Where θ—excess temperature, θ=t-t ∞ .

[0030] β n -Beyond equation Series of solutions.

[0031] It is called the Biot number, which represent...

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Abstract

The invention relates to the technical field of test of thermophysical parameters of materials and discloses a method and a system for testing a thermal diffusion coefficient of a solid material. The method comprises the following steps: generating a circulating water flow in a water circulation system, contacting the circulating water flow with one side of a flat sample, and performing heat convection, wherein a heat convection coefficient between the circulating water flow and the sample surface is large enough, so that a Boit number Bi goes to infinity; controlling the temperature of the circulating water flow through a temperature control system, so that constant temperature is kept; acquiring surface temperature change on an insulating side of the flat sample through a temperature acquisition and analysis system, and calculating to obtain the thermal diffusion coefficient value of the tested sample through a mathematical model. High-temperature circulating water serves as a heat source, thermal contact resistance does not exist between the heat source and the tested sample, and enough test precision is guaranteed. The Boit number is controlled, so that the heat exchange process under the first type of boundary conditions is realized between the water and a sample surface, and an aim of directly calculating the thermal diffusion coefficient is achieved.

Description

Technical field [0001] The invention belongs to the technical field of material thermal property parameter testing, and specifically relates to a solid material, particularly a thermal diffusivity test method and system for a solid material with impermeable water. Background technique [0002] As an important parameter of solid materials, thermal diffusivity characterizes the heat transfer performance and temperature balance performance of materials. It is an important index for analyzing the heat conduction process in materials. It is also important in the fields of materials, energy, construction, national defense, chemical engineering, and refrigeration engineering. With the development of modern industry, its test method has always been one of the research hotspots. The existing test methods are mainly divided into steady-state method and non-steady-state method. The steady-state method is based on Fourier's law of heat conduction. It mainly includes round tube method, heat f...

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Application Information

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IPC IPC(8): G01N25/20
Inventor 陈清华庞立黎贤东董长帅袁力吴亮徐曼曼
Owner ANHUI UNIV OF SCI & TECH
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