Apparatus and method for measuring thermal conductivity of solid powder by transient hot zone method
A transient tropic method, solid powder technology, applied in the direction of material thermal development, etc., can solve the problems of poor contact between powder and tropics, easily broken welding lines, and tropic tension, etc., to achieve accurate results, high device reliability, and experimental results. good accuracy
Inactive Publication Date: 2017-12-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
[0007] The present invention provides a solid powder for measuring the thermal conductivity of solid powder by using the transient hot zone method, which has problems such as loose contact between the powder and the hot zone, tension in the hot zone, easy breakage of welding lines, electric leakage, and flying powder. Apparatus and Method for Transient Tropical Method Measuring Thermal Conductivity
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Embodiment 1
[0039] Connect the measuring device 11 as image 3 In the test circuit shown, a DC power supply is used to heat the hot zone, and the temperature and voltage data during the heating process are collected by the data collector.
[0040] The formula for calculating the thermal conductivity of the tested sample is: k=P 0 / (4π) / [dT(t) / dln(t)]
[0041] where P 0 is the heating power, t is the heating time, dT(t) / dln(t) is the slope of the temperature against ln(t) after heating for a few seconds.
[0042] Thus, the thermal conductivity of the solid powder to be tested in an indoor environment can be measured.
[0043] If the test device 11 is placed in such as Figure 4 In the vacuum furnace shown, by changing the temperature, pressure and gas atmosphere in the furnace, the thermal conductivity of the solid powder under different temperature, pressure and atmosphere conditions can be measured. The center of the top cover 1 of the test device is a transparent mesh. It does not ...
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The invention relates to a device and a method for measuring the thermal conductivity of solid powder by a transient thermal method. The measuring device includes a top cover 1 , an upper box body 2 , a heating tape 3 , a lower box body 4 , a heating tape clip 5 , a dynamic heating tape clip 6 , a guide rail 7 , a spring 8 , a thermocouple 9 and a voltage measuring wire 10 . The invention adopts a tropical fixing structure with tensioning function to ensure that the tropical belt can be stretched at different temperatures; the powder containing box is divided into upper and lower parts, which is convenient for powder filling and ensures full contact between the tropical belt and the powder; The welding lines are arranged and drawn out on the tropical belt to enhance the shock resistance of the lines; a mesh top cover is installed on the top of the container to prevent the powder from escaping. The measurement device shown is placed in a vacuum furnace to measure the thermal conductivity of solid powders under different temperatures, pressures and gas atmospheres.
Description
technical field [0001] The invention belongs to the technical field of thermal physical property testing of solid powder, and in particular relates to a device and method for measuring the thermal conductivity of solid powder by a transient hot zone method. Background technique [0002] Thermal conductivity is one of the most important thermophysical parameters of materials. It is an essential parameter in the heat transfer design of petroleum, chemical, energy, material, military production and other processes. It is also the basic data for the study of temperature fields in various thermal processes. There are two ways to measure the thermal conductivity of substances: steady-state methods (such as flat plate method, longitudinal heat flow method, spherical method, etc.) and unsteady-state methods (such as hot wire method, laser pulse method, etc.). Due to the advantages of short measurement time, less heat loss and preventing changes in the chemical properties and structu...
Claims
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IPC IPC(8): G01N25/20
Inventor 魏高升黄平瑞杜小泽杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)