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Simulating the structure and air permeability of needle-punched nonwoven layer

机译:模拟针刺非织造布层的结构和透气性

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摘要

The aim of this article is to study and simulate the structure of needle-punched nonwoven fabrics in order to predict air permeability of nonwoven filters. For this purpose, the Poisson's random number process has been used to model the random position of fibers in a web. A simple and easy-to-use expression was developed to predict the number of webs in a layer, considering the thickness and areal density of nonwoven fabrics. A 3D model was generated by assembling simulated webs. The GAMBIT meshing software was used to generate the mesh for the Computational Fluid Dynamic (CFD) solver. The outlet pressure of generated model was determined by means of CFD tool. Different types of needle-punched nonwoven fabrics were produced using Polyester fibers with different cross section and counts. The air permeability test was carried out on the samples, and the outlet pressure of each sample were measured and compared with theoretical values. The results showed that the simulated structure is capable to predict the air permeability of nonwoven filters adequately. The main novelty of the model is the ability of simulating the structure and air permeability of multi constituent nonwoven layers.
机译:本文的目的是研究和模拟针刺非织造织物的结构,以预测非织造过滤器的透气性。为此,已经使用泊松随机数过程来模拟纤维网中纤维的随机位置。考虑到非织造织物的厚度和面密度,开发了一种简单易用的表达式来预测一层中的纤维网数量。通过组装模拟网生成3D模型。 GAMBIT网格划分软件用于为计算流体动力学(CFD)求解器生成网格。生成的模型的出口压力通过CFD工具确定。使用具有不同横截面和支数的聚酯纤维生产了不同类型的针刺无纺布。对样品进行透气性测试,并且测量每个样品的出口压力并将其与理论值进行比较。结果表明,模拟结构能够充分预测非织造过滤器的透气性。该模型的主要新颖之处在于能够模拟多组分非织造布层的结构和透气性。

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