Measurement-Based Obtaining System and Method for Equivalent Maximum Pore Diameter of Fiber Material

Abstract

The present invention provides a measurement-based system and method for obtaining the equivalent maximum pore diameter of fiber materials, including a measurement chamber 28, an air processing system, an image control system 11, and a central processing system 12. By adjusting the constant temperature and humidity environment, the porous material is collected Water absorption image, measurement of water weight change and other steps, combined with factors such as water evaporation rate on the surface of the material to establish a fractal model, and finally calculate the equivalent maximum pore size of the porous material. The present invention utilizes a system combining real-time dynamic image acquisition and weight acquisition to quickly, continuously, automatically and synchronously observe the water absorption process of materials, and obtain material porosity and permeability. With the help of fractal theory, the relationship between the material's macroscopic water absorption characteristics (water absorption height / weight) and the material's microstructure parameters is established, and then the microstructure characteristics of the material are obtained to improve the accuracy of the experiment, and the surface evaporation rate obtained from the experiment is introduced to improve The predictive accuracy of the model.

Description

technical field [0001] The invention belongs to the technical field of studying the macroscopic parameters of porous materials on the microscale by using fractal theory, dynamic image processing and weight acquisition technology, and particularly 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 utilizes the evaporation of water 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 does not increase the moisture content of the s...

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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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