Simulations of filter media performances from microtomography-based computational domain. Experimental and analytical comparison

Gervais, Pierre-Colin; Bourrous, Soleiman; Dany, Frisma Dhesa; Bouilloux, Laurent; Ricciardi, Laurent

doi:10.1016/j.compfluid.2015.04.019

Cited by 41 publications

(29 citation statements)

References 22 publications

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“…Depending on the SEM observation, pore structure parameters, and area extension data of the ripple‐like PA‐6 NF/N filters, the virtual clones of filter media and filtration process were designed employing the FiberGeo and FilterDict procedures, as demonstrated in Figure (detailed information was given in the Supporting Information). FiberGeo generated the minimal representative domains for filters with and without PET filaments (Figure a,a′), respectively.…”

Section: Resultsmentioning

confidence: 99%

A Controlled Design of Ripple‐Like Polyamide‐6 Nanofiber/Nets Membrane for High‐Efficiency Air Filter

Zhang

Liu

Zuo

et al. 2017

Small

131

105

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The filtration capacity of fibrous media for airborne particles is restricted by their thick diameter, low porosity, and limited frontal area. The ability to solve this problem would have broad technological implications for various air filtration applications; despite many past efforts, it remains a great challenge to achieve. Herein, a facile and scalable strategy to fabricate the ripple-like polyamide-6 nanofiber/nets (PA-6 NF/N) air filter via combining electrospinning/netting technique with receiving substrate design is demonstrated. This proposed approach allows the scaffold filaments to orderly embed into 2D PA-6 nanonets layer with Steiner-tree structures and nanoscale diameter of ≈20 nm, resulting in the ripple-like membrane with extremely small pore size, highly porous structure, and hugely extended frontal surface, by facilely adjusting its pleat span and pleat pitch. These unique structural advantages enable the ripple-like PA-6 NF/N filter to filtrate the ultrafine particles with high removal efficiency of 99.996%, low air resistance of 95 Pa, and robust quality factor of >0.11 Pa ; using its superlight weight of 0.9 g m and physical sieving manner. This approach has the potentialities to give rise to a novel generation of filter media displaying enhanced filtration capacity for various applications thanks to their nanoscale features and designed macrostructures.

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Section: Resultsmentioning

confidence: 99%

A Controlled Design of Ripple‐Like Polyamide‐6 Nanofiber/Nets Membrane for High‐Efficiency Air Filter

Zhang

Liu

Zuo

et al. 2017

Small

131

105

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“…There are two major application types of the air filter media, wearable respirators and air filter equipment (vacuum cleaner bags, indoor air cleaning, indoor air purifiers), possessing different priority criteria of fibrous properties. To unravel the behavior of structural properties to collection efficiencies and to acquire comparable results from theoretical predictions and experimental data, considerable effort has been devoted to the development of filtration modeling using three-dimensional (3D) filter structures obtained by different approaches as more and more microstructural properties of filter media have been taken into account [12][13][14][15]. Moreover, the filtration performance is strongly influenced by the porosity of the fibrous material but no reliable methods in determining porosity is well known.…”

Section: Introductionmentioning

confidence: 99%

Multi-Scale Microstructure Investigation for a PM2.5 Air-Filter Efficiency Study of Non-Woven Polypropylene

Lam

Huang

et al. 2019

QuBS

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A N95 face-piece respirator and a 3M air filter composed of non-woven polypropylene filter material were investigated for their multi-scale microstructure and resulting filtration performance. Filtration mechanisms of each system are found and quantified. Both media showed a gradually decrease of the most penetrating particle size with respect to an increase in face velocity or surface charge density. Increasing the face velocity and porosity dramatically degraded the collection efficiency in the 3M filter rather than in the N95 system. We exploited three-dimensional X-ray tomography to characterize the morphological and geometrical properties of the fiber arrangement and deposition of aerosol on the fiber surface. Tuning the most predominant material parameters to achieve a precedence in lower pressure drop or higher collection efficiency in a specifically captured particle size range is of great requisite to a peculiar application of the filter media.

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“…For an estimate of uncertainty of sample preparation, simulations were run for two different sand samples that were split into 5 subsamples, to obtain an overall variability of ±20%. Recent work has demonstrated the quality of the numerical solution of the FlowDict solver in comparison to observations [43][44][45].…”

Section: X-ray Micro Computed Tomography (Xrt)mentioning

confidence: 99%

Infiltration Response of Adsorbent Amended Filters for Stormwater Management under Freezing/Thawing Conditions

Monrabal-Martinez

Scibilia

Maus

et al. 2019

Water

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Coastal cold climates experience frequent intermittent melting and freezing periods over the cold period. This intermittent freezing in stormwater systems affects the infiltration capacity and hence the performance. This paper investigates the infiltration capacity of engineered filter media (composed of sand mixed with charcoal, pine bark, or olivine) under freezing temperatures in a column-based laboratory setup. Infiltration into partially frozen filter media was replicated using a climate room. The filter media in the columns were brought to −2.5 • C, and water at +2 • C was percolated through the columns with a constant head of 5 cm. Infiltration performance was assessed by observing the time until breakthrough, and the infiltration rate 24 h after breakthrough. The results were compared to the observed hydraulic conductivity for the unfrozen filter media. A novel approach combining the unfrozen water content curves with X-ray tomographic (XRT) images of the materials was adopted to better understand the thermal and infiltration processes. Breakthrough was observed between ca. 21 and 56 h in all columns. The column with homogeneously mixed filter media with sand yielded the quickest breakthrough. The infiltration rates were higher than recommendations for infiltration-based systems in cold climates, making them a suitable option in cold climates.

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Simulations of filter media performances from microtomography-based computational domain. Experimental and analytical comparison

Cited by 41 publications

References 22 publications

A Controlled Design of Ripple‐Like Polyamide‐6 Nanofiber/Nets Membrane for High‐Efficiency Air Filter

A Controlled Design of Ripple‐Like Polyamide‐6 Nanofiber/Nets Membrane for High‐Efficiency Air Filter

Multi-Scale Microstructure Investigation for a PM2.5 Air-Filter Efficiency Study of Non-Woven Polypropylene

Infiltration Response of Adsorbent Amended Filters for Stormwater Management under Freezing/Thawing Conditions

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