A kind of thermal conductivity measuring instrument and measuring method
A measurement method and technology of thermal conductivity, which is applied in the thermal conductivity measuring instrument and measurement field of bulk materials, can solve problems such as poor measurement accuracy of thermal conductivity, achieve the effect of improving measurement accuracy and avoiding adverse effects
Active Publication Date: 2017-11-28
CHINA AGRI UNIV
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[0006] The invention provides a thermal conductivity measuring instrument and a measuring method, which can solve the problem of poor thermal conductivity measurement accuracy of bulk materials in the prior art
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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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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. The measuring instrument includes a heat source, a plurality of temperature sensors, a temperature controller (12) and a signal processor (11). The temperature controller (12) is connected with the heating rod (1) of the heat source; the signal processor (11) is connected with a plurality of temperature sensors and also connected with the heating rod (1) of the heat source. The measurement method includes the following steps: arrangement of the measuring instrument→reading configuration→parameter setting→data collection→thermal conductivity calculation. The thermal conductivity measuring instrument and measuring method of the present invention can directly measure the thermal conductivity of the measured medium on site, reducing the various influences of human interference on the testing process, thereby avoiding the impact of changing the environment on the measurement due to sampling. The adverse effect brought by the result greatly improves the measurement accuracy of the thermal conductivity of the measured medium.
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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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