The Filtration of Fibrous Aerosols

Asgharian, Bahman; Cheng, Yung Sung

doi:10.1080/027868202753339041

Cited by 16 publications

(6 citation statements)

References 25 publications

(32 reference statements)

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“…He showed a higher possibility of fibrous aerosol passing through a filter especially at a lower filtration velocity. Asgharian and Cheng (2002) analyzed the trajectories of fibrous aerosol particles which rotate by a shear force in a flow field. They derived the single fiber capturing efficiency by inertia and interception as a function of Stokes number and the aspect ratio of fibrous particles.…”

Section: Introductionmentioning

confidence: 99%

Filtration of Multi-Walled Carbon Nanotube Aerosol by Fibrous Filters

Seto¹,

Furukawa²,

Ōtani³

et al. 2010

Aerosol Science and Technology

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Filtration efficiency of multi-walled carbon nanotube (MWCNT) aerosol by fibrous filter was evaluated experimentally. Mono-mobility test aerosols with electrical mobility diameter of 100, 200, and 300 nm were generated by the atomization of MWCNT aqueous suspension followed by mobility classification with a differential mobility analyzer (DMA). By analyzing the shape of classified aerosol particles under a scanning electron microscope, it was found that the DMA-classified 300 nm particles were fibrous in shape and had uniform diameter of about 60 nm and length of 2.1 micrometer. On the other hand, 100 nm and 200 nm particles contained a fairly large amount of multiply charged fibrous particles with a larger diameter. These test aerosols were challenged to a medium performance fibrous filter at various filtration velocities. As a result, fibrous particles were captured by fibrous filter at a higher collection efficiency than the spherical particles with the same mobility. By analyzing the single fiber capturing efficiency, interception incorporating the rotation of fibrous particles is found to be the dominant capturing mechanism for the fibrous particles in the studied size range.

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Section: Introductionmentioning

confidence: 99%

Filtration of Multi-Walled Carbon Nanotube Aerosol by Fibrous Filters

Seto¹,

Furukawa²,

Ōtani³

et al. 2010

Aerosol Science and Technology

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“…Much research has been undertaken into understanding the removal of particles by the mechanisms of interception, inertial impaction, gravitational capture and diffusional deposition for a clean filter and is now reasonably well understood. See for example Lee and Gieseke (1980), Fardi and Lui (1992), Ingham et al (1989), Harrop andStenhouse (1969), Pich (1973), Stechkina and Fuchs (1966), Zhu et al (2000)., Asgharian and Chenh (2002).…”

Section: Introductionmentioning

confidence: 99%

A numerical study of the effects of loading from diffusive deposition on the efficiency of fibrous filters

Dunnett

Clement

2006

Journal of Aerosol Science

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“…The good agreement is attributed to the well-controlled homogeneous structure of the custom-made metal fiber media, which has very uniform fiber diameter (Figure 1b) unlike most fibrous media. Soot particles have a fractal-like structure that enhances their effective interception length, as reported for other non-spherical particles including nanoparticle agglomerates (Boskovic et al 2009;Kim et al 2009), fibrous aerosols (Asgharian and Cheng 2002;Myojo 1999), and carbon nanotubes (Wang et al 2011a,b). As can be seen in Figure 5, soot particles below 80 nm have nearly the same penetration as KCl particles.…”

mentioning

confidence: 71%

Evaluation of metallic filter media for sub-micrometer soot particle removal at elevated temperature

Maricq

Pui

2017

Aerosol Science and Technology

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Soot particle removal performance of two types of metallic filter media, sintered metal powder and sintered metal fiber, is experimentally evaluated as potential improvements to conventional ceramic filtration media for gasoline direct injection (GDI) engine PM after-treatment application. Soot collection efficiency and flow resistance of several grades of metallic media are measured at temperatures of 25, 350, and 650 C and a range of representative filtration velocities for submicrometer soot particles generated from a propane flame. Theoretical collection efficiency based on single fiber efficiency theory shows good agreement with experimental data for nearly spherical KCl particles at 350 C. Improved collection efficiency is observed for soot particles in the interception-dominated size range above »100 nm due to enhanced interception length. Soot collection is slightly enhanced at higher temperature, which is consistent with model predictions. Sintered metal fiber media are found capable of removing »75% of soot particles by mass with an incremental flow resistance of less than 1.5 kPa under 10 cm/s and 350 C, which is promising for gasoline particulate filter (GPF) application. The media level figure of merit (FOM) is used to quantify the soot collection efficiency versus flow resistance tradeoff of all media tested. It is found that due to their more open structure (higher porosity) sintered metal fiber media have FOMs nearly one order of magnitude higher than those of sintered metal powder media, and by analogy those of conventional wall flow ceramic media. This suggests that sintered metal fiber media represents an attractive alternative to ceramic media for designing GPFs; however, further research into creating comparable surface area to the honeycomb structures used for wall flow filters is needed to extract the full potential of metal fiber media.

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The Filtration of Fibrous Aerosols

Cited by 16 publications

References 25 publications

Filtration of Multi-Walled Carbon Nanotube Aerosol by Fibrous Filters

Filtration of Multi-Walled Carbon Nanotube Aerosol by Fibrous Filters

A numerical study of the effects of loading from diffusive deposition on the efficiency of fibrous filters

Evaluation of metallic filter media for sub-micrometer soot particle removal at elevated temperature

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