3D Air Filtration Modeling for Nanofiber Based Filters in the Ultrafine Particle Size Range

Abstract

Abstract. In this work, novel 3D filtration model for nanofiber based filters has been proposed and tested. For the model validation purposes, filtration efficiency characteristics of two different polyurethane nanofiber based structures (prepared by the electrospinning process) were determined experimentally in the ultrafine particle size range (20-400 nm). It has been found that the proposed model is able to reasonably predict the measured filtration efficiency curves for both tested samples.

3D air filtration modeling for nanofiber based filters in the ultrafine particle size range

“…Liberec, Czech Republic, http://www.elmarco.com/) [8][9] equipped with patented rotating electrode with 3 cotton cords spinning elements (PCT/CZ2010/000042). The experimental conditions were as follows: relative humidity 25%, temperature 24°C, electric voltage applied into PU solution 75 kV, distance between electrodes 210 mm, rotational electrode speed 7 rpm and speed of supporting textile collecting nanofibers was 0.32 m.min -1 .…”

“…In the following step, circles with centerpoint, a point of the centerline, have been fitted in the white fiber area and consequently rotated along the fiber centerline which results in a single 3D model layer and can be used to create the full 3D model having given mass area and thickness. It should be mentioned that in our previous work [8], the fiber structure complexity has been reduced considerably due to assumption that each nanofiber can be viewed as the number of interconnected tubes. In this work, this assumption is relaxed in order to take varying fiber, curvature and possible defect correctly into account.…”

“…In this work, this assumption is relaxed in order to take varying fiber, curvature and possible defect correctly into account. The comparison between the 'old methodology' [8] and the 'improved methodology' utilized in this work is provided in Figure 5 for an identical SEM image. It is clearly visible that the improved methodology allows representing the 3D nanofiber based structure more realistically than utilization of old methodology.…”

Morphology of Nano and Micro Fiber Structures in Ultrafine Particles Filtration

“…The obtained SEM pictures have consequently been used for the determination of fibre diameter, nanofibre layer thickness and fibre diameter/pore size distribution by using recently proposed digital image analysis technique [4][5][6].…”

“…For this assessment carried out on actual nanofibre structures produced we used recently proposed digital analysis of SEM images [4][5][6]. The analysis was based on an examination of the change in richness of grey halftones caused by a change in the thickness of nanofibre nonwoven textiles.…”