Clogging of fibrous filters by liquid aerosol particles: Experimental and phenomenological modelling study

Frising, T.; Thomas, Dominique; Bémer, Denis; Contal, P.

doi:10.1016/j.ces.2004.12.026

Cited by 104 publications

(86 citation statements)

References 21 publications

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“…With the lengthening of the treatment time and increasing power of discharge, a slight growth in the number deformations and non-uniformities on the fibre surface was observed due to the etching, which is consistent with the results described in the literature (Contal et al, 2004;Frising et al, 2005;Raynor and Leith, 2000;Walsh and Stenhouse, 1997). No significant differences in the morphology of fibre surface were observed for the nonwovens modified in nitrogen, oxygen or air plasma, regardless of the selected processing parameters.…”

Section: Resultssupporting

confidence: 80%

Influence of Low-Temperature Plasma Treatment on The Liquid Filtration Efficiency of Melt-Blown PP Nonwovens in The Conditions of Simulated Use of Respiratory Protective Equipment

Majchrzycka

Brochocka

Urbaniak–Domagała

2017

Chemical and Process Engineering

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Filtering nonwovens produced with melt-blown technology are one of the most basic materials used in the construction of respiratory protective equipment (RPE) against harmful aerosols, including bio-and nanoaerosols. The improvement of their filtering properties can be achieved by the development of quasi-permanent electric charge on the fibres. Usually corona discharge method is utilized for this purpose. In the presented study, it was assumed that the low-temperature plasma treatment could be applied as an alternative method for the manufacturing of conventional electret nonwovens for the RPE construction.Low temperature plasma treatment of polypropylene nonwovens was carried out with various process gases (argon, nitrogen, oxygen or air) in a wide range of process parameters (gas flow velocity, time of treatment and power supplied to the reactor electrodes). After the modification, nonwovens were evaluated in terms of filtration efficiency of paraffin oil mist. The stability of the modification results was tested after 12 months of storage and after conditioning at elevated temperature and relative humidity conditions. Moreover, scanning electron microscopy and ATR-IR spectroscopy were used to assess changes in surface topography and chemical composition of the fibres. The modification of melt-blown nonwovens with nitrogen, oxygen and air plasma did not result in a satisfactory improvement of the filtration efficiency. In case of argon plasma treatment, up to 82% increase of filtration efficiency of paraffin oil mist was observed in relation to untreated samples. This effect was stable after 12 months of storage in normal conditions and after thermal conditioning in (70 ± 3)°C for 24 h. The use of low-temperature plasma treatment was proven to be a promising improvement direction of filtering properties of nonwovens used for the protection of respiratory tract against harmful aerosols.

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Section: Resultssupporting

confidence: 80%

Influence of Low-Temperature Plasma Treatment on The Liquid Filtration Efficiency of Melt-Blown PP Nonwovens in The Conditions of Simulated Use of Respiratory Protective Equipment

Majchrzycka

Brochocka

Urbaniak–Domagała

2017

Chemical and Process Engineering

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“…discrepancies are however low, at high velocity. This may be because at the beginning of filtration the deposition of the propylene glycol aerosol particles is made up of droplets deposited around the fibers and form liquid films on the surface of the filter medium but the fibers were not perfectly wetted with liquid while an adapted version of Davies' (1973) (b) (a) pressure drop model gives, however, quite satisfactory results for the first filtration stage (Frising et al, 2005) when the liquid wets the fibers perfectly and is uniformly distributed throughout the fibrous filter.…”

Section: Resultsmentioning

confidence: 95%

“…Frising et al (2005) showed that the pressure drop evolution occurred in four filtration stages. In the first stage, the liquid is only deposited on the surface of a fiber.…”

Section: Davies F Dmentioning

confidence: 99%

“…The influences of velocity were investigated by Contal et al (2004) and Frising et al (2005). As might be expected, at high filtration velocity, the liquid aerosol particles were rapidly deposited on the collecting surface causing an increase of the pressure drop.…”

Section: Introductionmentioning

confidence: 99%

“…Mist aerosol particles can be generated in several industrial production processes including chemical production, mechanical atomization, evaporation-condensation, entrainment by the gas flow in liquid-gas contactors, and other processes (Frising et al, 2005). People exposed to fine aerosol particles can have their skin contaminated and inhale them to cause damage to their lungs.…”

Section: Introductionmentioning

confidence: 99%

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Pressure Drop EVOLution of a Medium-Performance Fibrous Filter during Loading of Mist Aerosol Particles

Tekasakul

Suwanwong

Ōtani

et al. 2008

Aerosol Air Qual. Res.

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Collection characteristics of mist aerosol particles by a medium-performance fibrous filter was studied by analyzing the effect of filtration velocity, numbers of filter, types of liquid with different physical properties (palm oil and propylene glycol) during the initial filtration period and the saturation behavior. The results show that the pressure drop evolutions during clogging increases when the filtration velocity increases because at high filtration velocity, the aerosol particles deposit on the collecting surface rapidly. Furthermore, the change in pressure drop increases with increasing numbers of filter. Particle size, concentration, viscosity and surface tension of the liquids have an influence on clogging. The deposition of palm oil aerosol particles is only made up of droplets deposited around the fibers while in the case of propylene glycol the droplets deposited around the fiber join to form bridges and liquid films on the surface of the filter so that the fibrous filter that is exposed to propylene glycol aerosol has a higher pressure drop. The result of saturation behavior study shows that the saturation pressure drop from the lower initial velocity is greater than that from the higher initial velocity. The retained mass on the filter sheet saturated with palm oil after the pressure drop is constant is higher than in the case of propylene glycol. Palm oil is more viscous than propylene glycol so that palm oil cannot re-entrain easily.

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Comparative performance of philic and phobic oil‐mist filters

et al. 2014

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The evolution of pressure drop, drainage rate, saturation, and efficiency of combined philic, and phobic oil mist filters in real‐time are examined. The experiments used four different filter configurations, with a combination of oleophobic and oleophilic fibrous filter media, and one oleophilic only reference. The effect of separating filter materials of differing wettability, with a mesh, was also explored. It was found that inclusion of a mesh between layers promoted increased drainage rates and resulted in a significantly lower pressure drop across the filter. The overall mass‐based filtration efficiency was also slightly higher for the configurations containing the mesh. Conversely, re‐entrainment of droplets from the rear face of the filter was only observed in filter configurations without the central mesh. Filters with oleophobic initial layers did not display a classical “depth filtration” pressure drop curve. The oleophobic media was found to possess lower steady‐state saturation than oleophilic media. Additionally, the steady‐state saturation of the oleophilic filter media, when placed at the rear of the filter, was lower when the central mesh was present. The saturation values were compared with recently published theory. © 2014 American Institute of Chemical Engineers AIChE J, 60: 2976–2984, 2014

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Clogging of fibrous filters by liquid aerosol particles: Experimental and phenomenological modelling study

Cited by 104 publications

References 21 publications

Influence of Low-Temperature Plasma Treatment on The Liquid Filtration Efficiency of Melt-Blown PP Nonwovens in The Conditions of Simulated Use of Respiratory Protective Equipment

Influence of Low-Temperature Plasma Treatment on The Liquid Filtration Efficiency of Melt-Blown PP Nonwovens in The Conditions of Simulated Use of Respiratory Protective Equipment

Pressure Drop EVOLution of a Medium-Performance Fibrous Filter during Loading of Mist Aerosol Particles

Comparative performance of philic and phobic oil‐mist filters

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