Abstract

Fundamental understanding of transport properties of non-woven fibrous material is depended on in dept cognition of their microstructure. Non-woven fibrous filter media are formed by the random distribution of fibers in a specific space exhibit a complicated pore size structure. Computing pore size distribution (PSD) is a vital parameter in studying material transport dynamics. In this work, a theoretical model was suggested based on the gamma distribution and fiber orientation distribution to predict the PSD in non-woven fibrous filter media. In parallel, the analytical model was compared with the previous PSD theories and experimental results. The 3D virtual fiber structure was constructed by using GeoDict code, and the pore size was represented by the inscribed circle diameter. Parameters influencing the PSD were studied, including fiber diameter, porosity, and fiber orientation. Comparison of simulation results with analytical model was made. The results demonstrate that the angle between the fiber and the Z-axis has little effect on the PSD. When the porosity is consistent, smaller pores can be formed by reducing fiber diameter. With the fiber diameter is constant, larger pores can be formed by increasing the porosity.

中文翻译：

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计算非织造纤维过滤介质中的孔径分布

摘要

对非织造纤维材料的传输特性的基本理解取决于对它们的微结构的认识。非织造纤维过滤介质是由纤维在特定空间内的随机分布形成的，并显示出复杂的孔径结构。计算孔径分布（PSD）是研究材料传输动力学的重要参数。在这项工作中，提出了一种基于伽玛分布和纤维取向分布的理论模型，以预测非织造纤维过滤介质中的PSD。同时，将分析模型与以前的PSD理论和实验结果进行了比较。使用GeoDict代码构建3D虚拟纤维结构，并用内接圆直径表示孔径。研究了影响PSD的参数，包括纤维直径，孔隙率和纤维取向。将仿真结果与解析模型进行了比较。结果表明，光纤与Z轴之间的角度对PSD影响很小。当孔隙率恒定时，可以通过减小纤维直径来形成较小的孔。在纤维直径恒定的情况下，可以通过增加孔隙率来形成较大的孔。