System and method for obtaining fiber material equivalent maximum aperture on basis of measurement

Abstract

The invention provides a system and a method for obtaining a fiber material equivalent maximum aperture on the basis of measurement. The system comprises a measurement chamber 28, an air processing system, an image control system 11 and a central processing system 12. Through steps of regulating a constant-temperature constant-humidity environment, collecting a porous material water adsorption image, measuring water weight change and the like, factors, including a material surface water evaporation rate, and the like, are combined to establish a fractal model, and finally, the equivalent maximum aperture of the porous material is calculated. By use of the invention, a system capable of combining real-time dynamic image collection and weight collection is used for quickly, continuously, automatically and synchronously observing a material water adsorption process so as to obtain the porosity and the permeability of the aperture. In virtue of a fractal theory, connection between the macroscopical water adsorption characteristics (water adsorption height / weight) of the material and the microstructure parameter of the material is established so as to obtain the microstructure characteristics of the material, experiment accuracy is improved, and a surface evaporation rate obtained by an experiment is introduced to improve model prediction accuracy.

Description

technical field [0001] The invention belongs to the technical field of using fractal theory and dynamic image processing and weight acquisition technology to study the microscopic macroscopic parameters of porous materials, and specifically relates to a measurement-based equivalent maximum pore diameter acquisition system and method for fiber materials. Background technique [0002] Evaporative cooling is a natural cooling method that uses water evaporation to absorb the latent heat of vaporization in the air. Because the compressor of the traditional vapor compression air conditioning system is not used, the power consumption is very low, and the pollution to the environment is very small. It is an energy-saving and environmentally friendly cooling method. Typical evaporative cooling methods include direct and indirect evaporative cooling. Compared with direct evaporative cooling, indirect evaporative cooling will not increase the moisture content of the air supply, and th...

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Problems solved by technology

[0007] 1. The traditional bubble pressure method, mercury intrusion method, and infiltration method for obtaining the pore size of materials, as well as transmission electron microscopy (TEM) and scanning electron microscopy (SEM) for analyzing the microstructure of materials, are limited by factors such as instruments, environments, and technical conditions. , it is impossible to quickly and directly obtain macroscopic parameters that reflect the overall microstructure, and it is also impossible to intuitively observe the physical process of water absorption that people care about.

[0008] 2. The traditional instrument for measuring the water absorption height of porous fiber materials is the Krem Absorption Tester, which is a static method for measuring the water absorption height, and cannot be accurate (especially in the initial stage of the experiment, manual observation of the height and readings) The measurement error is large, and the rapid change of the water absorption height cannot be accurately obtained), rapid and continuous measurement, and parameters such as material porosity, permeability and pore microstructure cannot be obtained

[0009] 3. The traditional methods of studying the water absorption height and fractal theory of porous materials do not consider the influence of the natural evaporation of water on the surface of the material to the surrounding environment

In traditional methods, these factors are not controllable, resulting in lower precision of experimental and theoretical methods

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