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Method for measuring effective diffusion coefficient and porosity of porous medium

A technology of diffusion coefficient and porous medium, applied in the field of testing, can solve the problems of toxicity of test gas, cumbersome measurement, difficult to measure quickly and accurately, etc.

Inactive Publication Date: 2012-06-20
DALIAN JIAOTONG UNIVERSITY
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Problems solved by technology

The method for measuring the porosity of porous materials in the prior art is generally the pressure-volume method. The disadvantage of this method is that the measurement is cumbersome, it is not easy to measure quickly and accurately, it cannot adapt to the actual needs of chemical industry and scientific research, and the test gas is toxic. Hazardous to human body and environment

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  • Method for measuring effective diffusion coefficient and porosity of porous medium
  • Method for measuring effective diffusion coefficient and porosity of porous medium
  • Method for measuring effective diffusion coefficient and porosity of porous medium

Examples

Experimental program
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Effect test

Embodiment 1

[0084] The liquid with ethanol as component A and air as component B, first measure the diffusion coefficient D of ethanol vapor in air AB , and then measure the effective diffusion coefficient D of ethanol vapor in the porous carbon paper ABP .

[0085] D ABP = ρ AL RTl p BM , p M A θ · z - z 0 p AX - p A 2

[0086] Determination of effective diffusion coefficient D of ethanol vapor in porous carbon paper ABP ...

Embodiment 2

[0137] Taking water as component A of liquid and component B as air, first measure the diffusion coefficient D of water vapor in air under different conditions AB , and then measure the effective diffusion coefficient D of water vapor in the porous carbon paper ABP .

[0138] Determination of effective diffusion coefficient D of water vapor in porous carbon paper ABP The parameters of are as follows:

[0139] R——gas constant, 8.314×10 3 N m / (kmol K);

[0140] m A - the molar mass of component A (water), 18.09kg / kmol;

[0141] θ——component A (water) liquid level in the evaporation tube by z 0 The time taken to drop to z, 18000s;

[0142] l—thickness of the porous membrane, m;

[0143] T - thermodynamic temperature, respectively 310K, 315K, 320K, 325K, 330K;

[0144] p AX ——Partial pressure of component A (water) under different conditions (calculated from formula (7)), Pa;

[0145] ρ AL ——Density of component A (water) at different temperatures, kg / m 3 ;

[0146] ...

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Abstract

A method for measuring the effective diffusion coefficient and the porosity of a porous medium includes steps as follows: using an evaporation tube method to measure the binary gas diffusion coefficient DAB of component A in component B and the effective diffusion coefficient DABP of component A in the measured porous medium, utilizing the relation between DAB and DABP to work out the ratio epsilon / tau of the measured porous medium porosity to the tortuosity factor, and obtaining the porosity of the measured porous medium according to the tortuosity factor tau. The invention has the advantageof rapidly and accurately measuring the porosity of the porous medium and the effective diffusion coefficient of a gas in the porous medium, thereby providing conditions for chemical engineering and scientific research practice.

Description

technical field [0001] The invention belongs to the technical field of testing, in particular to a method for measuring the effective diffusion coefficient and porosity of porous media. Background technique [0002] Diffusion processes pervade various fields of chemical engineering, such as catalysis, adsorption, and membrane separation processes, where the diffusion of fluid mixtures in porous media is a decisive factor in determining process performance. Diffusion of gas in porous media is different from diffusion in free media. Due to the resistance of solid media, the corresponding diffusion coefficient will decrease. Different porous materials have different porosity and tortuosity factors. Therefore, it is of great significance to accurately and quickly measure the porosity of porous materials and the effective diffusion coefficient of gas in porous media in chemical engineering and scientific research. The method for measuring the porosity of porous materials in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01N15/08
Inventor 王国香徐洪峰卢璐
Owner DALIAN JIAOTONG UNIVERSITY
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