Method for measuring thermal diffusivity and local heat transfer coefficient of wall body material through point source excitation surface thermal wave coupling infrared imaging

A technology for heat transfer coefficient measurement and thermal diffusivity, applied in the field of measurement of local heat transfer coefficient of solid surface, can solve the problem of high cost

Pending Publication Date: 2022-02-01
CHONGQING TECH & BUSINESS UNIV
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This work relies heavily on human intervention, and the cost is high

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  • Method for measuring thermal diffusivity and local heat transfer coefficient of wall body material through point source excitation surface thermal wave coupling infrared imaging
  • Method for measuring thermal diffusivity and local heat transfer coefficient of wall body material through point source excitation surface thermal wave coupling infrared imaging
  • Method for measuring thermal diffusivity and local heat transfer coefficient of wall body material through point source excitation surface thermal wave coupling infrared imaging

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[0036] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] Such as figure 2As shown in the figure, the measurement method of wall material thermal diffusivity and local heat transfer coefficient is measured by point source excitation of surface thermal wave coupled with infrared imaging. Composed of a computer and a digital acquisition computer, the thermal diffusivity of the wall material and the local heat transfer coefficient of the side to be measured can be obtained under the following two sets of conditions:

[0039] It is known that the outer distance center of the point source laser heating area is r 0 and r 1 Th...

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Abstract

The invention relates to a method for measuring the thermal diffusivity and a local heat transfer coefficient of a wall body material through point source excitation surface thermal wave coupling infrared imaging, in particular to the technical field of measurement technologies of the local heat transfer coefficient of a solid surface. The method comprises the step of acquiring a function relationship between a phase difference of temperature fluctuations between two reference points outside a point heat source boundary and a local heat exchange coefficient of a side to be measured by utilizing an analytical solution of a one-dimensional unsteady state heat conduction equation under a cylindrical coordinate under the condition of a periodic point heat source and a convection (and radiation) heat exchange boundary (which can be regarded as a source item) of the side to be measured. The method can be further used for measuring the thermal diffusivity of the wall body under the condition that the two sides of a wall body are good in heat insulation. The method is not influenced by the temperature measurement precision of a thermal infrared imager, and non-contact rapid measurement can be realized through thermal disturbance applied by a point-shaped periodic laser heat source and surface temperature signal acquisition based on infrared imaging.

Description

technical field [0001] The invention relates to the technical field of measuring the local heat transfer coefficient of a solid surface, in particular to a method for measuring the thermal diffusivity of a wall material and the local heat transfer coefficient of a point source excited surface thermal wave coupled with infrared imaging. Background technique [0002] Heat transfer coefficient refers to the heat transferred by convection and / or radiation on a solid surface per unit area and unit time under the condition of unit temperature difference, and the international unit is watt / (m 2 ·Kelvin). The heat transfer coefficient is one of the index parameters to measure the performance of the heat exchanger. [0003] The heat transfer coefficient can generally be obtained by numerical calculation and experiment. Numerical calculation refers to the process of iteratively solving the constitutive equation (group) corresponding to the physical model and obtaining the surface he...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 董涛史中远宋海雨杨朝初何永清蒋庄德
Owner CHONGQING TECH & BUSINESS UNIV
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