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Porous medium equivalent thermal conductivity measurement method

A technology of equivalent thermal conductivity and porous media, applied in the direction of material thermal conductivity, etc., can solve problems such as inaccurate reference values, deviations, and heavy numerical calculation workload, and achieve a wide range of adaptation effects

Inactive Publication Date: 2016-12-21
BEIJING UNIV OF TECH
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Problems solved by technology

In many studies at home and abroad, the equivalent thermal conductivity of porous media adopts reference values ​​or is calculated numerically. In the actual process, the thermal conductivity will change with temperature, the reference value is relatively inaccurate, and the numerical calculation workload is relatively large. The actual process produces a large deviation

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, a method for measuring the equivalent thermal conductivity of porous media, based on the APDL program in ANSYS software, uses the method of finite element numerical simulation to calculate the heat transfer process of the model, randomly distributes the pore structure of porous materials according to the volume of pores, and analyzes Relationship between equivalent thermal conductivity and porosity for porous material models. The true density of the porous medium is measured by a true density meter, and the thermal conductivity of the porous medium at a certain porosity is measured by the laser flash method. Combined with the finite element simulation results, the equivalent thermal conductivity of the porous medium at different temperatures is calculated.

[0027] Such as figure 2 The finite element numerical simulation method is u...

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Abstract

The invention relates to a porous medium equivalent thermal conductivity measurement method, and belongs to the field of porous medium heat transfer. According to the present invention, based on the APDL program in ANSYS software, the heat transfer process of a model is calculated by using a finite element numerical simulation method, the pore structure of a porous material is randomly distributed according to the volume pore, the relationship between the porous material model equivalent thermal conductivity and the porosity is analyzed, the true density of the porous medium is measured by using a true density meter, the thermal conductivity of the porous medium under a certain porosity is measured by using a laser flashing method, the finite element simulation result is combined, and the porous medium equivalent thermal conductivities at different temperatures are calculated.

Description

technical field [0001] The invention relates to a method for measuring the equivalent thermal conductivity of a porous medium, which belongs to the field of porous medium heat transfer. Background technique [0002] Porous media materials are composed of solid skeleton and pores. The thermal conductivity of porous media has always been concerned. It is difficult to directly measure the thermal conductivity of solid skeleton and the pore structure affects the heat transfer. The heat transfer of porous materials involves not only heat conduction between fluid and solid, but also convective heat transfer. When the temperature is high, heat radiation is also considered, and the heat transfer mechanism is very complicated. The heat transfer process of porous materials is a comprehensive process of heat conduction, convection, and radiation. This comprehensive heat transfer process can be expressed by the equivalent thermal conductivity. In many studies at home and abroad, the e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/18
CPCG01N25/18
Inventor 王景甫王哲郭莲莲
Owner BEIJING UNIV OF TECH
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