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Thermal-property transient measurement method and device

A measurement method and technology of thermophysical properties, applied in the field of measurement, to achieve the effects of easy correction, little environmental interference, and high measurement accuracy

Inactive Publication Date: 2011-09-14
陈昭栋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hot wire method still fails to break through the category of steady-state measurement. It is not a real transient measurement method, and needs to be improved and improved.

Method used

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  • Thermal-property transient measurement method and device

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Embodiment Construction

[0056] The basic principle of the present invention is based on placing a hot needle in a uniform and infinite medium, and continuously heating the medium through the hot needle with a constant heat flow to form a one-dimensional cylindrical heat transfer model along the radial direction. The thermal model is characterized by:

[0057]

[0058] (1)

[0059]

[0060]

[0061] In the formula:

[0062] Indicates that in the material to be tested, the distance from the central axis of the hot needle is r, τ=t-t 0 temperature change over time;

[0063] t 0 (s) is the starting time of heating measurement.

[0064]T(r, t) (°C) is the temperature in the medium at a distance of r from the central axis of the hot needle at time t;

[0065] T(r,t 0 )(°C) is the temperature at the starting moment of heating measurement at a distance of r from the central axis of the hot needle in the medium;

[0066] is the thermal diffusivity of the material to be tested;

[0067] ...

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Abstract

The invention discloses a thermal-property transient measurement method and device, which are used for automatically measuring thermal conductivity, thermal diffusion coefficient, specific heat at constant pressure and density of a material and are also used for analysing the regular pattern of the thermal property of the material near the room temperature along the change of the temperature. The method comprises the following steps of: placing a cylindrical hot needle in a uniform and infinite medium; and continuously heating the medium by a constant thermal flow through the hot needle to form a one-dimensional cylindrical heat-transferring model in the radical direction. The measurement device comprises a direct-current stable-current power supply, the hot needle, a temperature signal collecting module, a signal processor, a memory and a display. A column body of the hot needle is made of carbon fibre and is composed of a core column and a sleeve pipe; the electric heating element is wounded on the core column through a double-head manganin lacquered wire and the double-head manganin lacquered wire is formed by doubling and winding one manganin lacquered wire along the central point; and an thermoelectric couple is formed by welding one copper wire and one konstantan wire in the thermoelectric couple grade.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a thermal property transient measurement method and device, which are used to automatically measure the thermal conductivity, thermal diffusivity, constant pressure specific heat and density of materials; and analyze the thermal properties of materials near room temperature as they change with temperature the law. Background technique [0002] The thermal physical properties of materials refer to the thermal conductivity, thermal diffusivity, specific heat at constant pressure and density of materials. The so-called transient automatic measurement is to quickly complete automatic measurement, recording, and data processing during the heating process. [0003] At home and abroad, in the 1970s and 1980s, there was a climax in the research on the transient measurement technology of thermal physical properties. Many well-known scholars at home and abroad have done a...

Claims

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Application Information

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IPC IPC(8): G01N25/20G01N9/02
Inventor 陈昭栋
Owner 陈昭栋
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