The fibrous media composed of elliptical fibers is widely used owing to the high filtration efficiency. However, there are few studies on the arrangement of non-circular fibers, although the single non-circular fiber has been clearly investigated. In this article, two-dimensional numerical geometries of fibrous media with different elliptical fiber arrangements, namely, random distribution structure, dense–sparse structure, and bimodal structure, are developed for studying filtration performance. The results show that the large aspect ratio and solid volume fraction represent low particle penetration. When the particle diameter (Dp) is small, the quality factor of bimodal structure is higher than the dense–sparse structure, especially at Dp = 50 nm. For the large Dp, the opposite is true. Meanwhile, reducing fiber diameter (Df) is more significant than increasing solid volume fraction in terms of improving penetration. As for dense–sparse structure, replacing the elliptical fibers in sparse layers with circular fibers can comprehensively improve the quality factor of fibrous media. However, if the replacement between elliptical fiber and circular fiber occurs in dense layer, it will result in high quality factor at Dp ⩽ 500 nm, while low quality factor at Dp > 500 nm.

中文翻译：

---

不同排列椭圆纤维过滤性能研究

由椭圆形纤维组成的纤维介质由于过滤效率高而被广泛使用。然而，尽管对单根非圆形纤维进行了明确的研究，但对非圆形纤维排列的研究却很少。在本文中，开发了具有不同椭圆纤维排列的纤维介质的二维数值几何结构，即随机分布结构、密集-稀疏结构和双峰结构，用于研究过滤性能。结果表明，大的纵横比和固体体积分数代表低颗粒渗透。当粒径 (Dp) 较小时，双峰结构的品质因数高于密集-稀疏结构，尤其是在 Dp = 50 nm 时。对于大 Dp，情况正好相反。同时，在提高渗透率方面，减小纤维直径 (Df) 比增加固体体积分数更重要。对于密疏结构，用圆形纤维代替稀疏层中的椭圆形纤维可以全面提高纤维介质的品质因数。然而，如果椭圆纤维和圆形纤维之间的置换发生在致密层，则会导致 Dp ⩽ 500 nm 处的品质因数较高，而 Dp > 500 nm 处的品质因数较低。