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Method for measuring heterogeneous medium content of material based on volume thermal mass

A technology of heterogeneous content and thermal mass, applied in the field of determination of heterogeneous content in materials based on volumetric thermal mass, can solve the problems of inability to realize real-time, poor adaptability, low accuracy, etc., and achieve the effect of rapid test method

Inactive Publication Date: 2014-03-12
DALIAN UNIV OF TECH +1
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  • Description
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Problems solved by technology

The drying method requires sampling, which takes a long time and cannot be realized in many cases, and real-time monitoring of moisture cannot be achieved
The resistance method and the capacitance method use the dielectric properties of the material to measure indirectly, which is fast, but has poor adaptability and low accuracy.

Method used

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  • Method for measuring heterogeneous medium content of material based on volume thermal mass
  • Method for measuring heterogeneous medium content of material based on volume thermal mass
  • Method for measuring heterogeneous medium content of material based on volume thermal mass

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Embodiment Construction

[0013] The following steps are described in detail by taking the transient hot wire method as an example, but the present invention is not limited to obtaining the effective thermal conductivity and effective thermal diffusivity through the transient hot wire method. When embedding the hot wire and temperature sensor, make the direction of the probe parallel to the embedded hot wire; the embedded hot wire is powered by a regulated power supply; before the test, the temperature field inside the test body tends to be uniform.

[0014] Using the hot wire method to measure the thermal conductivity and thermal diffusivity, the time is short and the temperature difference is small, which can minimize the moisture migration inside the measured object during the test, so as to obtain more accurate data. The surface of the heating wire should be electrically insulated as much as possible. When selecting the type of heating wire, ensure that the resistivity of the heating wire changes li...

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Abstract

The invention relates to a method for measuring the heterogeneous medium content of a material based on volume thermal mass. A temperature sensor and a heat source are arranged in an object to be measured; after the heat source realizes heating, a data acquirer acquires temperature data. An effective heat conduction coefficient and effective thermal diffusivity are calculated according to experiment data, and then the volume thermal mass is calculated; therefore, the content of heterogeneous medium components is calculated according to a formula disclosed by the invention. The method disclosed by the invention is simple and feasible; real-time monitoring can be realized without implementation of sampling. According to the method, a wet multipore material is used as a mixture containing the heterogeneous medium components, and a transient hot-wire theory is used as a method for measuring the effective heat conduction coefficient and the effective thermal diffusivity, so that a complete process of measuring the heterogeneous medium content is stated in detail. However, the method is not limited to water content detection and can be also applied to detection of gas components doped in multiphase fluid pipelines.

Description

technical field [0001] The invention belongs to the field of material detection and analysis, and relates to a method for measuring heterogeneous content in materials based on volumetric heat mass. Background technique [0002] The content of heterogeneous components in the mixture has a great influence on the characteristics of the material itself. For example, the moisture content of the porous material determines the strength, heat retention, conductivity, and fresh-keeping time of the material. This description will take the detection of moisture content as an example, but the application of the present invention is not limited to the detection of water content, such as the detection of the content of heterogeneous gas mixed in the sealed pipeline also belongs to the application scope of the present invention. [0003] With the development and progress of science and technology, moisture detection has been listed as one of the basic items of physical and chemical analysi...

Claims

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Application Information

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IPC IPC(8): G01N25/20
Inventor 张腾飞沈润霖林钊信尹久盛王树刚
Owner DALIAN UNIV OF TECH
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