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

Self Cite

Abstract. Realistic SEM image based 3D filter model considering transition/free molecular flow regime, Brownian diffusion, aerodynamic slip, particle-fiber and particle-particle interactions together with a novel Euclidian distance map based methodology for the pressure drop calculation has been utilized for a polyurethane nanofiber based filter prepared via electrospinning process in order to more deeply understand the effect of particle-fiber friction coefficient on filter clogging and basic filter characteristics. Based on the performed theoretical analysis, it has been revealed that the increase in the fiber-particle friction coefficient causes, firstly, more weaker particle penetration in the filter, creation of dense top layers and generation of higher pressure drop (surface filtration) in comparison with lower particle-fiber friction coefficient filter for which deeper particle penetration takes place (depth filtration), secondly, higher filtration efficiency, thirdly, higher quality factor and finally, higher quality factor sensitivity to the increased collected particle mass. Moreover, it has been revealed that even if the particle-fiber friction coefficient is different, the cake morphology is very similar.

Section: Flow Field Calculationmentioning

confidence: 99%

Section: Filter Model Description 3d Filter Structure Modelmentioning

confidence: 99%

Section: Filter Model Description 3d Filter Structure Modelmentioning

confidence: 99%

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Effect of particle-fiber friction coefficient on ultrafine aerosol particles clogging in nanofiber based filter

Sambaer¹,

Zatloukal²,

Kimmer³

2013

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“…In some cases the SEM images obtained were consequently used to determine fibre diameter distribution, pore size distribution, build up representative 3D filter models and filtration efficiency by using the recently developed UTB soft Filtration v1.0.1 simulation software utilizing digital image analysis technique and filtration model described in [8][9][10].…”

Section: Es and Mb Filter Sample Characterizationmentioning

confidence: 99%

The effect of combination electrospun and meltblown filtration materials on their filtration efficiency

Kimmer¹,

Vincent²,

Sambaer

et al. 2015

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Abstract. Filtration materials prepared by combination of electrospun nanofibers and meltblown microfibers (both fixed on polypropylene spunbond supports) were characterized from the point of view of their filtration efficiency in ultrafine particles separation. Compared are electrospun and meltblown structures and their combinations characterized by means of digital image analysis properly. Layer of electrospun nanofibers in MB air filtration materials can ensure improvement of filtration efficiencies for ultrafine particles separation.

“…In some cases the SEM images obtained were consequently used to determine fibre diameter distribution and pore size distribution by using the recently developed UTBsoft Filtration v1.0.1 simulation software utilizing digital image analysis technique described in [3][4][5][6][7].…”

Section: Filter Sample Characterizationmentioning

confidence: 99%

The effect of nanofiber based filter morphology on bacteria deactivation during water filtration

Kimmer¹,

Vincent²,

Lev³

et al. 2013

Self Cite

Abstract. Procedures permitting to prepare homogeneous functionalized nanofibre structures based on polyurethanes modified by phthalocyanines (PCs) by employing a suitable combination of variables during the electrospinning process are presented. Compared are filtration and bacteria deactivation properties of open and planar nanostructures with PCs embedded into polyurethane chain by a covalent bond protecting the release of active organic compound during the filtration process. Finding that the morphology of functionalized nanofibre structures have an effect on bacterial growth was confirmed by microbiological and physico-chemical analyses, such as the inoculation in a nutrient agar culture medium and flow cytometry.