Measuring instrument and measuring method for heat conductivity

A measurement method and technology of thermal conductivity, which are applied in the thermal conductivity measuring instrument and measurement field of bulk materials, and can solve the problems of poor thermal conductivity measurement accuracy and so on.

Active Publication Date: 2016-01-06
CHINA AGRI UNIV
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[0006] The invention provides a thermal conductivity measuring instrument and a measuring method, which c

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  • Measuring instrument and measuring method for heat conductivity
  • Measuring instrument and measuring method for heat conductivity
  • Measuring instrument and measuring method for heat conductivity

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[0059] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0060] The theoretical basis of the thermal conductivity measuring instrument and measurement method of the present invention is the steady-state mapping method, and the theory shows that when a thin rod is vertically buried in the ground as a heat source and the temperature of the thin rod is controlled, the pair of thin rods buried in its The surrounding material produces a stable temperature field distribution, and its temperature field distribution has a definite relationship with the thermal conductivity. The present invention is a measuring instrument developed on the basis of this theory. Its principle is: bury a thin rod of reasonable size, heat the thin rod and control the temperature of the thin rod, and then according to the average heating amount and the temperature field of the surrounding tes...

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Abstract

The invention relates to a measuring instrument and a measuring method for heat conductivity, in particular to a measuring instrument and a measuring method for the heat conductivity of a bulk material. The measuring instrument comprises a heat source, a plurality of temperature sensors, a temperature controller (12) and a signal processor (11); the temperature controller (12) is connected with a heating rod (1) of the heat source; the signal processor (11) is connected with the plurality of temperature sensors, and is also connected with the heating rod (1) of the heat source. The measuring method comprises the following steps: measuring instrument arrangement, reading configuration, parameter setting, data acquisition and heat conductivity calculation. According to the measuring instrument and the measuring method for the heat conductivity, disclosed by the invention, the heat conductivity of a measured medium can be directly measured on site, therefore various influences brought to a testing process by human disturbances are reduced, the negative influence brought to a measuring result due to the fact that the environment is changed by sampling is avoided, and the measurement accuracy of the heat conductivity of the measured medium is greatly improved.

Description

technical field [0001] The invention relates to a thermal conductivity measuring instrument and a measuring method, in particular to a bulk material thermal conductivity measuring instrument and a measuring method. Background technique [0002] Thermal conductivity, also known as "thermal conductivity", reflects the thermal conductivity of materials and is an important indicator of thermal physical properties. According to different principles, the thermal conductivity of materials can be divided into two categories: steady-state heat conduction and unsteady-state heat conduction. The former can directly measure the thermal conductivity of the sample after the temperature field of the sample reaches stability. The latter is to measure the thermal diffusivity a during the unsteady heat conduction process of the sample, and under the condition that the density ρ of the sample and the specific heat capacity c of the sample are known, use λ=a / cρ to calculate the Thermal conduc...

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Application Information

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IPC IPC(8): G01N25/20
Inventor 袁小艳高明桂心哲赵淑梅王建平李桂朋
Owner CHINA AGRI UNIV
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