Abstract

Fibrous filters are effective for the removal of ultrafine particles and have been widely used. According to filtration theory, diffusion and interception are the main particle collection mechanisms for removing ultrafine particles, and these are greatly affected by fiber diameter. Particle collection efficiency by diffusion and interception increases as the fiber diameter decreases. Most of the previous studies conducted by researchers have focused on the effect of fiber diameter on filtration performance; however, they used filter media with different physical properties. Therefore, it is important to clearly understand the influence of fiber diameter alone on filtration performance in filters with the same physical properties (e.g., packing density, filter thickness, and fiber weight per unit area).

In this study, PVA nanofiber filters with different fiber diameters (100, 201, and 306 nm) were prepared with other physical properties the same, using electrospinning. In addition, the effect of fiber diameter on filtration performance was examined by experimental and theoretical investigation. Filtration performance as determined by pressure drop and particle collection efficiency, increased with decreasing fiber diameter, as expected according to filtration theory. Furthermore, the filter quality factor (representing filtration performance), increased with decreasing fiber diameter.

摘要

纤维过滤器对于去除超细颗粒是有效的，并且已被广泛使用。根据过滤理论，扩散和截留是去除超细颗粒的主要颗粒收集机制，这些受纤维直径的影响很大。随着纤维直径的减小，通过扩散和拦截产生的颗粒收集效率增加。研究人员先前进行的大多数研究都集中在纤维直径对过滤性能的影响上。但是，他们使用了具有不同物理特性的过滤介质。因此，重要的是要清楚地理解单独的纤维直径对具有相同物理特性（例如堆积密度，过滤器厚度和每单位面积纤维重量）的过滤器中过滤性能的影响。

在这项研究中，使用静电纺丝法制备了具有不同纤维直径（100、201和306 nm）的PVA纳米纤维滤光片，其其他物理性质相同。另外，通过实验和理论研究检验了纤维直径对过滤性能的影响。如过滤理论所述，由压降和颗粒收集效率决定的过滤性能随纤维直径的减小而增加。此外，过滤器品质因数（代表过滤性能）随着纤维直径的减小而增加。