Structure characterization of the clogging process of coarse fibrous filter media during solid particle loading with X-ray micro-computed tomography

Song, Yu; Shim, Eunkyoung

doi:10.1016/j.seppur.2021.118980

Cited by 16 publications

(4 citation statements)

References 26 publications

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“…Second, compared to the PVDF membrane, AgNPs/PVDF nanofiber/net membranes are expected to show a relatively small filtration resistance when considering the air slip effect due to the small diameter of nanowires in nanonets. 52 However, converse results were observed, as shown in Figure 9b, which can be ascribed to the coexistence of nanonets and nanofibers in a mixed and hierarchical way. Lastly, when the cumulative filtration time exceeds 144 min, the filtration resistance exceeds 343.2 Pa, thus, ceasing to satisfy the filtration requirements, denoting a service life of 144 min.…”

Section: Resultsmentioning

confidence: 78%

“…Lastly, when the cumulative filtration time exceeds 144 min, the filtration resistance exceeds 343.2 Pa, thus, ceasing to satisfy the filtration requirements, denoting a service life of 144 min. As the filtration process continues, salt aerosol particles trapped by the nanonets accumulate, resulting in the gradual increase of filtration resistance, and finally exceeding the technical requirements of the medical protective mask. , …”

Section: Resultsmentioning

confidence: 99%

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Ag Nanoparticles-Decorated PVDF Nanofiber/Net Membranes with Enhanced Filtration and Antibacterial Efficiency for Personal Protective Equipment

Kang,

Huang,

Qin

et al. 2024

ACS Appl. Nano Mater.

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Medical protective masks with both high antibacterial activity and filtration efficiency have gained wide interest due to sporadic respiratory disease outbreaks. Previous studies have focused on improving a single function (antibacterial activity or filtration) of the mask performance. Herein, we developed silver nanoparticlesdecorated PVDF membranes (AgNPs/PVDF) with both high antibacterial activity and filtration efficiency. Our results show that AgNPs/PVDF membranes have antibacterial efficiency of 99.98% and 99.86% against E. coliand S. aureus, respectively. The bacterial filtration efficiency is higher than 95%. PM 0.26 filtration efficiency can be maintained above 95% after continuous filtration for 144 min. Adding AgNPs also promotes distinct hierarchical structure formation, which could improveme the filtration efficiency. This study provides a new methodology to fabricate antibacterial membranes doped with metal nanoparticles with promising applications in personal protective equipment development.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Ag Nanoparticles-Decorated PVDF Nanofiber/Net Membranes with Enhanced Filtration and Antibacterial Efficiency for Personal Protective Equipment

Kang,

Huang,

Qin

et al. 2024

ACS Appl. Nano Mater.

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“…In the case of the studied materials, it was assumed that the limit of separation of the two periods (I and II) would be the moment when the filtration efficiency φ w = 99.5% was achieved. A similar method of analyzing the filtration process in fibrous partitions, i.e., dividing the dust collection process into three stages, is presented in [56]. Such a course of characteristics of filtration efficiency and accuracy, as well as flow resistance, should be explained by the fact that dust grains retained on the baffle fibres as a result of the main filtration mechanisms (inertial, direct hooking and diffusion) are a source of formation of secondary elements of the filter material structure.…”

Section: Analysis Of Test Results Of Nonwoven Filter Fabrics Operatin...mentioning

confidence: 99%

Experimental Testing of Filter Materials for Two-Stage Inlet Air Systems of Internal Combustion Engines

Dziubak

2024

Energies

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This paper presents an experimental study of the effect of the mass of dust retained on a fibrous filter bed operating singly and in a “cyclone-filter-bed” system on changes in filtration efficiency and accuracy, as well as the increase in flow resistance. The research was carried out using a novel and unprecedented method, determining the dust absorption coefficient km of the filter baffle under laboratory conditions. A filtration system built of a single cyclone and a cylindrical filter cartridge with an appropriately sized surface set behind it was studied. Conditions corresponding to the actual operating conditions of the air filter were maintained: dust concentration, filtration speed and dust extraction from the cyclone settling tank. The purpose of the research was to evaluate filter materials with different structures in terms of filtration efficiency and accuracy, as well as flow resistance. The study showed that the parameters of the structure of filter materials—permeability, grammage and thickness—affect the process of retaining dust particles. It was shown that the increase in the flow resistance of the filter bed has a higher intensity when dust grains of small sizes are directed at it, which is the case when the bed is operated behind a cyclone, which separates larger dust grains from the air. There is a reduction in the operating time of the filtration system due to the limitation of the permissible resistance ∆pfdop, and the corresponding dust absorption km has a lower value. For a fixed value of the flow resistance, the dust absorption coefficient km2 of three different filtration baffles AC, B2, and B, working with a cyclone, take values 50–100% smaller than when working in a single-stage system. It has been shown that the “cyclone-filter baffle” unit, due to its greater dust separation capability, allows the filter cartridge to operate for a longer time until a certain flow resistance is reached. This allows the unit to operate longer at lower flow resistance without changing the filter cartridge, thus saving energy. The km values obtained during the tests, using the proposed original method, allow the selection of the filter bed for specific vehicle operating conditions by modelling its course.

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“…In the recent literature, we have found the application of image processing technology by some scholars [7][8][9] to describe the structure of nonwovens, particularly the scanning electron microscope (SEM), 10 the digital volumetric imaging (DVI) micro-imager, 11 computer tomography (CT), 12,13 and the optical microscope (OM). 14,15 However, these methods cannot reconstruct the internal longitudinal structure of nonwovens completely or in a systematic way.…”

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confidence: 99%

An improved algorithm for three-dimensional reconstruction of nonwoven microstructures by using multi-focus images

Zhang

et al. 2022

Textile Research Journal

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The filtration performance of nonwovens, such as virus protection and air purification, depends largely on their microstructure, that is, their internal structure. With the development of manufacturing techniques, nonwovens can be produced with complex microstructures to deliver low air resistance and high filtration efficiency. Therefore, it seems important to reconstruct an accurate three-dimensional (3D) model to describe the various microstructures for performance evaluation and product development. Multi-focus image fusion is one of the most effective ways used for the 3D nonwoven reconstruction. However, the overlapping and crossing of fibers in multi-focus images taken on an optional microscope make 3D fiber reconstruction incomplete and discontinuous. In this study, we developed a novel fiber segmentation and 3D nonwoven reconstruction algorithm to restore fiber continuity. The fiber web image was firstly thinned into the fiber mid-axis or skeleton, and fiber fragments were detected by searching the intersections. The features, such as the angle and depth, of each fiber fragment were obtained using Harris corner detection. A cluster technique was used to group the head-points of the fiber fragments that have similar features into one cluster. All fiber fragments in the same cluster are fitted with a polynomial curve to form a complete fiber in the 3D space. The experimental results show that this new method is suitable for the reconstruction of nonwovens with complex structures, such as fiber bonding or crossing, and can automatically detect and connect fiber fragments in 3D space. It provides an effective way for the subsequent simulation/evaluation of filtration characteristics.

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Structure characterization of the clogging process of coarse fibrous filter media during solid particle loading with X-ray micro-computed tomography

Cited by 16 publications

References 26 publications

Ag Nanoparticles-Decorated PVDF Nanofiber/Net Membranes with Enhanced Filtration and Antibacterial Efficiency for Personal Protective Equipment

Ag Nanoparticles-Decorated PVDF Nanofiber/Net Membranes with Enhanced Filtration and Antibacterial Efficiency for Personal Protective Equipment

Experimental Testing of Filter Materials for Two-Stage Inlet Air Systems of Internal Combustion Engines

An improved algorithm for three-dimensional reconstruction of nonwoven microstructures by using multi-focus images

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