Application of nanofibers to improve the filtration efficiency of the most penetrating aerosol particles in fibrous filters

Podgórski, Albert; Bałazy, A.; Gradoń, Leon

doi:10.1016/j.ces.2006.07.022

Cited by 454 publications

(364 citation statements)

References 15 publications

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“…The same principle applied to Filter B for the MPPS occurred at ~55 nm. These MPPSs were smaller than the previously reported results from building ventilation and vehicle cabin measurement studies (Xu et al, 2011;Podgórski et al, 2006;Leung et al, 2010). This is because the fiber solidity of aircraft cabin air filter is higher than the filters that are used in building ventilation or vehicle ventilation systems.…”

Section: Test Protocols and Data Analysiscontrasting

confidence: 51%

Investigation of the Performance of Airliner Cabin Air Filters throughout Lifetime Usage

Liu

Ren

et al. 2013

Aerosol Air Qual. Res.

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The air supply from an airliner ventilation system is a mixture of outside air and recirculated air that passes through a high efficiency particulate air (HEPA) filter. The effectiveness of two commercial-available airliner cabin air filters were investigated in laboratory-based measurements due to the practical restrictions on airliner cabin filter testing during usage. The filtration efficiency and pressure drop were assessed at a particle size range of 20-500 nm under various airflow rates throughout the filter usage period. The Most Penetrating Particle Sizes (MPPS) were observed at ~150 and ~55 nm, where the filtration efficiency was 86% and 99% at the rated airflow rates (1600 m 3 /h and 1970 m 3 /h), respectively. The filtration efficiency decreased in response to the increased airflow rate from 1000 m 3 /h to 2200 m 3 /h, with the greatest reduction (~10%) occurring at MPPS. An increase of 250 Pa in the pressure drop across the filter was observed as the airflow rate increased from 1000 m 3 /h to 2200 m 3 /h. Increased filter usage led to increases in both filtration efficiency and the pressure drop. The actual filter usage was estimated using dust loading in the laboratory. Filtration efficiency increased ~10% and the pressure drop increased ~800% when 220 g/m 2 dust was loaded on the filer, corresponding to ~6000 hours filter usage at an in-cabin PM 10 concentration of 100 μg/m 3 . Explicit relationships among filtration efficiency, pressure drop and filter usage under various in-cabin particle concentrations are presented as a reference to facilitate the use of more appropriate airliner cabin air filter exchange periods.

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Section: Test Protocols and Data Analysiscontrasting

confidence: 51%

Investigation of the Performance of Airliner Cabin Air Filters throughout Lifetime Usage

Liu

Ren

et al. 2013

Aerosol Air Qual. Res.

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“…This technique is also capable of producing nanofibrous filters (Gradoń et al 2005;Podgórski et al 2006). The challenge aerosols were monodisperse, electrostatically size-classified globular particles (proteins, silica particles) from 3.2-27.2 nm.…”

Section: Introductionmentioning

confidence: 99%

“…A mathematical model which explained these experimental findings was proposed by Podgórski (2009). Experimental investigation into nanoparticle filtration through nanofibrous media include works by Podgórski et al (2006), Wang et al (2008), and Leung et al (2009). Deposition of neutral, singly, doubly, and triply charged nanoparticles with diameters in the range 25-65 nm on metal wire screens was measured by Alonso et al (2007), and Heim et al (2010) measured deposition of singly charged particles with diameters 1.2-8 nm on metal wire grids.…”

Section: Introductionmentioning

confidence: 99%

Penetration of Monodisperse, Singly Charged Nanoparticles through Polydisperse Fibrous Filters

Podgórski

Maisser

Szymanski

et al. 2011

Aerosol Science and Technology

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The article presents experimental results and theoretical analysis of aerosol nanoparticle penetration through fibrous filters with a broad fiber diameter distribution. Four fibrous filters were produced using the melt-blown technique. The analysis of the filters' SEM images indicated that they had log-normal fiber diameter distribution. Five kinds of proteins and two types of silica particles were generated by electrospraying and were then classified using a Parallel Differential Mobility Analyzer to obtain well-defined, monodisperse, singly charged challenge aerosols with diameters ranging from 6.3 to 27.2 nm. Particle penetration through the filters was determined using a water-based CPC. Experimental results were compared first with predictions derived from the classical theory of aerosol filtration. It is demonstrated that it is inappropriate to apply it to the arithmetic mean fiber diameter, as this results in turn in a huge underestimation of nanoparticle penetration. A better, but still unsatisfactory agreement is observed when that theory was used together with the pressure drop equivalent fiber diameter or when the Kirsch model of nonuniform fibrous media was applied. We show that the classical theory applied to any fixed fiber diameter predicts a stronger dependence of nanoparticle penetration on the Peclet number as compared to experimental data. All these observations were successfully explained by using our original partially segregated flow model that accounts for the filter fiber diameter distribution. It was found that the parameter of aerosol segregation intensity inside inhomogeneous filters increases with the increase in particle size, when the convective transport becomes more pronounced in comparison to the diffusive one.

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“…An electronic manometer was used to measure the filter resistance. The pressure drop across a filter can be estimated using the empirical correlation (Podg orski et al 2006) …”

Section: ¡1mentioning

confidence: 99%

Polyacrylonitrile microscaffolds assembled from mesh structures of aligned electrospun nanofibers as high-efficiency particulate air filters

Kao

et al. 2016

Aerosol Science and Technology

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Electrospun polyacrylonitrile (PAN) fibers of very small diameters have potential for integration into filters capable of increasing the particle filtration efficiency. To fulfill the requirements for high-efficiency particulate air (HEPA) filters with a reasonable pressure drop, we generated aligned electrospun PAN fibers through pre-alignment at various rotation rates and subsequent solvent vapor annealing (SVA) under a loading. We evaluated the properties of microscaffold filters assembled from aligned electrospun PAN fibers in the form of linear, square, and triangular multiple meshes. The microscaffolds featuring multiple square meshes exhibited dramatically increased filtration efficiency without a significant pressure drop. A nine-layer cross-ply structure provided a filtration efficiency of 99.98% for 0.25-mm particles at a face velocity of 10 cm s ¡1 ; its filtration quality factor was the highest among all of the tested microscaffolds. Thus, HEPA filters featuring a low packing density can be achieved using PAN fibers.

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Application of nanofibers to improve the filtration efficiency of the most penetrating aerosol particles in fibrous filters

Cited by 454 publications

References 15 publications

Investigation of the Performance of Airliner Cabin Air Filters throughout Lifetime Usage

Investigation of the Performance of Airliner Cabin Air Filters throughout Lifetime Usage

Penetration of Monodisperse, Singly Charged Nanoparticles through Polydisperse Fibrous Filters

Polyacrylonitrile microscaffolds assembled from mesh structures of aligned electrospun nanofibers as high-efficiency particulate air filters

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