Numerical modeling of solid deposits reorganization during consecutive solid-liquid aerosol filtration: Influence on the dynamics of filtration efficiency

Gac, Jakub M.; Jackiewicz, A.; Werner, Łukasz; Jakubiak, Szymon

doi:10.1016/j.jaerosci.2018.02.008

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…4 first proposed by Müller (Müller et al, 2014). The full numerical model of this phenomenon was presented in details in our previous work (Gac et al, 2018). We have shown that in the presence of liquid film during the aerosol deposition, additional interactions between solid particles appear, which build the agglomerate.…”

Section: Accepted Manuscriptmentioning

confidence: 81%

“…The reason was that the oil coating minimizes the amount of particle motion along the fibre after the initial collision. Other studies investigated the consecutive filtration of solid and liquid aerosols (Gac et al, 2018(Gac et al, , 2016 to determine the influence of solid deposits on droplet filtration and the morphology reorganisation of these deposits during filtration. It has been proven that liquid aerosol addition results in lower efficiency in the consecutive filtration of solid and liquid particles because liquid droplets destroy the dendrite-like structures, and the liquid deposited on the fibres prevents their formation (Gac et al, 2016).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…When solid particles are close enough but do not touch each other and are connected by a liquid bridge, the surface tension of liquid acts on the solid particles (Lian et al, 1993). In the paper (Gac et al, 2018) numerical simulations have been carried which allowed to track the change in the structure of agglomerates. The obtained results are consistent with scanning electron microscopy (SEM) observations.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Filtration of Submicron Soot Particles, Oil Droplets, and their Mixtures on Single- and Multi-layer Fibrous Filters

Kamiński

Gac

Sobiech

et al. 2022

Aerosol Air Qual. Res.

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The dynamics of filtration efficiency and pressure drop during the simultaneous filtration of soot and oil aerosols on single-and multi-layer filters were investigated, and the determined filtration efficiency was compared with the theoretical efficiency obtained via the classical filtration theory. Additionally, the influence of liquid-phase aerosols on the morphology of the formed deposits was investigated. It was concluded that the addition of oil aerosols decreased the filtration efficiency and lowered the pressure drop increase rate for multi-layer filters.Additionally, for the filtration of aerosols containing soot and high oil concentrations, once maximum filtration efficiency was reached, an efficiency decrease occurred. The system imperfection factor was proposed as a mean to predict the efficiency of multi-layer filters. The modified version of the single fibre efficiency method was used to calculate filter mass change with reasonable accuracy.

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Section: Accepted Manuscriptmentioning

confidence: 81%

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

See 1 more Smart Citation

Filtration of Submicron Soot Particles, Oil Droplets, and their Mixtures on Single- and Multi-layer Fibrous Filters

Kamiński

Gac

Sobiech

et al. 2022

Aerosol Air Qual. Res.

Self Cite

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“…In contrast, in the work by [ 32 ], the influence of soot particles on the filtration efficiency of liquid aerosols was investigated. There are also studies on the alternating (consecutive) filtration of solid and liquid particles [ 33 , 34 ]. These works theoretically and experimentally observed as well as numerically described the collapse of the filtration deposits under the influence of the deposited liquid, which resulted in a decrease in filtration efficiency and flow resistance during such a process compared to the filtration of only solid particles.…”

Section: Introductionmentioning

confidence: 99%

Pressure Drop Dynamics during Filtration of Mixture Aerosol Containing Water, Oil, and Soot Particles on Nonwoven Filters

et al. 2023

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The pressure drop dynamics during the filtration of three-component mixture aerosols are investigated and compared with two and single-component aerosols. The main area of interest is the effect of the addition of a small quantity of liquid (oil) and solid (soot) particles during the filtration of aerosol containing water mist. In addition, calculations of the change in filter mass during oil aerosol filtration have been carried out and compared with the experimental results. The new, improved filtration efficiency model takes into account a better coefficient fitting in the filtration mechanism equations. The limitations in the change in fibre diameter and packing density resulting from the filter loading have been implemented in the model. Additionally, the calculation model employs the fibre size distribution representation via multiple average fibre diameters. The changes in fibre diameter are dependent on each fibre’s calculated filtration efficiency. The improved filtration model has been utilised to predict the mass change of the filters during the filtration of pure and mixture aerosols. The pressure drop calculation model based on changes in filter mass has been formulated. The model is then utilised to calculate pressure drop changes resulting from the filtration of the oil aerosol and water and oil mixture aerosol.

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“…Filtration of mixture aerosols differs from filtration of sole solid or sole liquid aerosols. Interactions between particles in the case of simultaneous filtration of solid and liquid particles lead to changes in the filter structure that have a significant impact on filter efficiency (Agranovski and Shapiro, 2001;Gac et al, 2018Gac et al, , 2016Mullins et al, 2003). Previous studies carried out for consecutive filtration of solid and liquid particles have partly revealed the mechanisms of formation and degradation of the solid structure formed from the solid particles deposited on the fibres.…”

Section: Introductionmentioning

confidence: 99%

Mixture Aerosols Filtration on Filters with Wide Fibre Diameter Distribution - Comparison with Theoretical and Empirical Models

Kamiński

Gac

Sobiech

et al. 2022

Aerosol Air Qual. Res.

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A methodology for calculating aerosol filtration efficiency using non-woven filters with polydispersity distribution of fibre diameters was formulated. In order to verify the results of the calculations experimentally, filters made of polypropylene non-woven fabric were used to filter solid (soot) and liquid (oil) aerosols and their mixtures with different concentrations. In order to increase the accuracy of the calculations, the division of the diameter distribution into several (1-100) ranges of values was considered. The influence of the number of these intervals for theoretical and empirical equations available in the literature was investigated. This effect was found to be significant, and replacing one diameter value representing all the fibres in the filter with twenty diameter ranges, each representing only a fraction of the total fibres, is sufficient to minimize the error due to the underrepresentation of the actual fibre distribution in the filter. Calculation of the mean particle size after the filter was performed using a set of theoretical and empirical equations. The calculations take into account the change in packing density, flow velocity and fibre diameter over time as a result of filling the filter with particles deposited on it. The obtained results were compared with the measurement results. It has been found that such changes in the monofilament performance model are insufficient to properly describe the effects inside the filter.

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Numerical modeling of solid deposits reorganization during consecutive solid-liquid aerosol filtration: Influence on the dynamics of filtration efficiency

Cited by 12 publications

References 25 publications

Filtration of Submicron Soot Particles, Oil Droplets, and their Mixtures on Single- and Multi-layer Fibrous Filters

Filtration of Submicron Soot Particles, Oil Droplets, and their Mixtures on Single- and Multi-layer Fibrous Filters

Pressure Drop Dynamics during Filtration of Mixture Aerosol Containing Water, Oil, and Soot Particles on Nonwoven Filters

Mixture Aerosols Filtration on Filters with Wide Fibre Diameter Distribution - Comparison with Theoretical and Empirical Models

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