Abstract: Considering the structural characteristics of fibers, the arrangement of fibers and the number of layers of fibers, the micro-size model of pleated fibers filter media was established based on the control program written by MATLAB, and its solid volume fraction (?) of pleated fibers filter media was calculated. The mathematical correlation between filtration velocity (v) and pressure loss (Δp) of micro-size model was obtained by numerical simulation, and then the viscous drag coefficient (C1) was solved. Based on the above work, a macro-size model of pleated fiber filter media was established, and based on ? and C1 obtained by the micro-size simulation, the mathematical correlation between the face velocity (u) and Δp at macro-size was solved by numerical simulation method, and the mathematical correlation were compared with several empirical formulas. The results showed that the arrangement of the fibers and the thickness of the pleated fiber filter media had an effect on Δp, but had little effect on C1 and other properties. In addition, the properties of pleated fiber filter media obtained at micro-size can provide guidance for macro-size research, and the property parameters of macrostructure can be obtained by using the data obtained from the microstructures. The research results of this study had important theoretical and practical significance for expanding the research methods of fiber filter media and optimizing its structure.

Key words: Pleated fiber filter media, Pressure drop, Multi-scale simulation, CFD

摘要： 统筹考虑纤维结构特性、纤维排布及纤维层数等因素，基于MATLAB编写控制程序，建立褶型纤维过滤介质微观尺寸模型，并计算过滤介质固体体积分数?，采用数值模拟方法获取微观尺寸下过滤风速v与压力损失Δp之间的数学关联式，进而获取介质的粘性阻力系数C1。在此基础上，建立褶型纤维过滤介质宏观尺寸模型，基于微观尺寸模拟得到的?及C1，采用数值模拟的方法得到宏观尺寸下迎面风速u与Δp之间的数学关联式，并将数学关联式与多个经验公式进行对比。结果表明，褶型纤维过滤介质内纤维排列方式及介质厚度对Δp有影响，但对C1等性质参数影响不大；微观尺寸研究得到的参数可以为宏观尺寸研究提供指导，微观结构与宏观结构性质参数可以沿用。本研究结果对拓展纤维过滤介质的研究方法及优化其结构具有重要理论及实际意义。

关键词: 褶型纤维过滤介质, 压力损失, 多尺度模拟, CFD