Numerical and experimental study of submicron aerosol deposition in electret microfiber nonwovens

Kerner, Max; Schmidt, K.; Hellmann, A.; Schumacher, Stefan; Pitz, Michael; Asbach, Christof; Ripperger, Siegfried; Antonyuk, Sergiy

doi:10.1016/j.jaerosci.2018.05.004

Cited by 37 publications

(21 citation statements)

References 20 publications

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“…The 3D model generation of the fibrous structures is based on a mathematical algorithm described in our previous work [9]. Cylindrical fibers with defined diameter (distribution) are randomly created in a closed volume perpendicular to the flow direction until the desired porosity is reached.…”

Section: D Model Generationmentioning

confidence: 99%

“…The experimental investigations of the particle deposition in electret filters have been intensified since the first works of Lathrache [1][2][3] and Baumgartner [4,5]. Together with more recent studies focusing on pristine electret filters, it was found that particles are deposited by the Coulomb effect and dielectrophoresis in addition to the mechanical deposition, which shifts the MPPS to a size range of 0.03 to 0.06 µm and to a higher level [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…3D simulations are suitable for this purpose, since the variation of parameters can be time-optimized and the micro mechanisms can be investigated in detail. In the case of electret filters, various simulation setups have recently been presented to investigate the filtration efficiency [9,13,[29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…Taking this into account, the influence of both the Coulomb effect and dielectrophoresis on the particle deposition was implemented in the simulation setup used in our previous work [9]. The electric field is calculated by explicit integration of the charges over the fiber surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Electret Filters—From the Influence of Discharging Methods to Optimization Potential

Kerner

Schmidt²,

Schumacher

et al. 2021

Atmosphere

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Electret filters are electrostatically charged nonwovens which are commonly used in aerosol filtration to remove fine particles from gases. It is known that the charge and thus also the filtration efficiency can degrade over time. Thus, many testing standards require to remove the charge by treatment with liquid isopropanol (IPA) or IPA-saturated air. However, the parameters influencing this discharge have not been completely clarified yet. The aim of this work was, on the one hand, to experimentally investigate the influence of the IPA treatment on different electret filters and, on the other hand, to show the optimization potential of electret filters with respect to efficiency and long-term stability by numerical simulations. The experiments revealed that the air permeability is a central influencing parameter. Small pores lead to a reduced discharge efficiency using liquid IPA, while both treatment methods are suitable for larger pores. The simulations showed that a homogeneous charge distribution within the filter depth is advantageous for the initial performance. In contrast, charge penetrating deeper in the filter medium delays the charge decay and thus increases the operating time, with the trade-off of a lower initial performance.

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Section: D Model Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electret Filters—From the Influence of Discharging Methods to Optimization Potential

Kerner

Schmidt²,

Schumacher

et al. 2021

Atmosphere

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“…In some CFD simulations, a study of the influence of electrostatic effects can also be found. 35 The high computational expense and the representation of the filter media using simplified virtual filter structures with averaged porosity or fiber diameter limit the accuracy of these simulations.…”

Section: Introductionmentioning

confidence: 99%

Modeling the separation performance of depth filter considering tomographic data

Hoppe

Maricanov

Schaldach

et al. 2020

Env Prog and Sustain Energy

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Fibrous depth filters are frequently used for the purification of gas streams with low dust loadings, as well as processes where a high initial filtration efficiency is required (e.g., clean rooms for aseptic production). One tool suitable for supporting the development of optimized filter media is the use of numerical simulations. The drawback of this technique is the high computational resources required. In this work, a new and fast approach based on a one-dimensional model was applied. Structural characteristics (e.g., porosity distribution and fiber diameter) of two different filter media were successfully determined using a novel X-ray microscope. These characteristics were incorporated in the filtration model, and their influence on the calculations was evaluated. It was found that the porosity distribution does have an impact on local (microscopic) deposition rates, but only a minor influence on the macroscopic filtration efficiency (around 3%). Benefits of the model are the application of measured structural data and the low computational expense. Compared to experimental data (VDI 3926 / ISO 11057), the prediction of the filtration efficiency can be improved by incorporating the structural data in the model.

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Electrospun nylon‐66 nanofiber coated filter media for engine air filtration applications

Johnson,

Muzwar,

Ramakrishnan

et al. 2023

J of Applied Polymer Sci

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Air filtration plays a vital role in the performance and operations of engines, especially for heavy‐duty combat vehicles operating in the desert environment. Conventional cellulose media comprises micro‐fibers exhibiting low filtration efficiency for particles within the range of 0.1 to 0.5 μm (most penetrating particle size, MPPS). Nanofiber coating on cellulose media can increase the filtration efficiency, however, with the penalty of an increase in pressure drop. The features of nylon‐66 nanofibers, such as high mechanical strength, greater thermal stability, and high surface‐to‐volume ratio, will be beneficial for developing nano‐coated filter media. In this study, electrospun nylon‐66 nanofibers were coated over two cellulose‐based filter media and tested on an air filtration test rig that employs a suction‐type blower replicating the realistic condition of a heavy‐duty engine intake. The test rig was fabricated to evaluate the performance of the nano‐coated filter media in terms of pressure drop, filtration efficiency, and quality factor (Q‐factor). The experimental results demonstrated that the nylon‐66 nano‐coated media have higher Q‐factor (in the MPPS range) than the cellulose media due to the increased filtration efficiency compared to the rise in pressure drop. Therefore, such electrospun nylon‐66 nanofiber‐coated air filters can be an alternative to conventional cellulose media.

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Numerical and experimental study of submicron aerosol deposition in electret microfiber nonwovens

Cited by 37 publications

References 20 publications

Electret Filters—From the Influence of Discharging Methods to Optimization Potential

Electret Filters—From the Influence of Discharging Methods to Optimization Potential

Modeling the separation performance of depth filter considering tomographic data

Electrospun nylon‐66 nanofiber coated filter media for engine air filtration applications

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