Aerosol Filtration by Fibrous Filters: A Statistical Mechanics Approach

Zhong, Wen; Pan, Ning

doi:10.1177/0040517507078041

Cited by 15 publications

(8 citation statements)

References 17 publications

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“…The behavior of a system of this type will depend, on the one hand, on the characteristics of the fibers and, on the other, on the relative amounts of fibers and voids between fibers. Both parameters determine the points of contact between fibers, as well as the free segments of fibers between two contact points [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Imaging Techniques and Scanning Electron Microscopy as Tools for Characterizing a Si-Based Material Used in Air Monitoring Applications

et al. 2016

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This paper presents a study of the quartz fibrous filters used as a substrate for capturing the particulate matter (PM) present in the air. Although these substrates are widely used in environmental applications, their microstructure has been barely studied. The behavior of these devices during the filtration process was investigated in terms of their microstructure and the quartz fibers. Surface and cross sections were monitored. Scanning electronic microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), imaging and stereology techniques were used as tools for this purpose. The results show that most of the quartz filter fibers have sizes that allow them to be classified as nanofibers. It was also observed that, while the mechanisms of the mechanical capture of particles via impaction, interception and diffusion operate simultaneously in the outer zones of the filter cross section, the mechanism of capture by impaction is virtually non-existent in the innermost zones. Particles between 0.1 and 0.5 μm are known to be the most difficult to have captured by means of fibrous substrates. The fibers in inner zones were highly efficient in capturing this type of particle.

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Section: Resultsmentioning

confidence: 99%

Imaging Techniques and Scanning Electron Microscopy as Tools for Characterizing a Si-Based Material Used in Air Monitoring Applications

et al. 2016

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“…The Hamaker constant can be calculated as follows [ 46 , 82 ]:

where ε is the static dielectric constant, n is the refractive index, h is the Planck constant and ϑ e is the main electronic absorption frequency typically around 3 × 10 15 s −1 . The subscript notation 1, 2 and 3 of ε and n indicate the particle, membrane surface and fluid, respectively.…”

Section: Resultsmentioning

confidence: 99%

Numerical Comparison of Prediction Models for Aerosol Filtration Efficiency Applied on a Hollow-Fiber Membrane Pore Structure

Bulejko

2018

Nanomaterials

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Hollow-fiber membranes (HFMs) have been widely applied to many liquid treatment applications such as wastewater treatment, membrane contactors/bioreactors and membrane distillation. Despite the fact that HFMs are widely used for gas separation from gas mixtures, their use for mechanical filtration of aerosols is very scarce. In this work, we compared mathematical models developed for the prediction of air filtration efficiency by applying them on the structural parameters of polypropylene HFMs. These membranes are characteristic of pore diameters of about 90 nm and have high solidity, thus providing high potential for nanoparticle removal from air. A single fiber/collector and capillary pore approach was chosen to compare between models developed for fibrous filters and capillary-pore membranes (Nuclepore filters) based on three main mechanisms occurring in aerosol filtration (inertial impaction, interception and diffusion). The collection efficiency due to individual mechanisms differs significantly. The differences are caused by the parameters for which the individual models were developed, i.e., given values of governing dimensionless numbers (Reynolds, Stokes and Peclet number) and also given values of filter porosity and filter fiber diameter. Some models can be used to predict the efficiency of HFMs based on assumptions depending on the conditions and exact membrane parameters.

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“…Simulation models have been developed to aid related efforts, often by precisely and vividly representing the transport process of hazardous particles penetrating the fabric structure [ 63 ]. These researches are important because they generate further knowledge on which to base further research, and are themselves cost-effective than the normal experimental tests.…”

Section: Modeling and Simulation For Clothing Protectionmentioning

confidence: 99%