Modeling of submicrometer aerosol penetration through sintered granular membrane filters

Marre, Sonia; Palmeri, John; Larbot, A.; Bertrand, Marielle

doi:10.1016/j.jcis.2004.01.003

Cited by 14 publications

(13 citation statements)

References 48 publications

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“…Therefore filtration models must also assess their ability to predict the filtration efficiency as a function of the particulate size to track the change in PSD across the filter. Figure 13 represents the comparative between experimental and modelled filtration efficiency as a function of the particle size corresponding to PF #F. This particulate filter is a HEPA ceramic membrane filter whose geometrical characteristics and experimental data has been obtained from [41]. The measured filtration efficiency corresponds to four different cases defined by filtration velocity ranging from 0.01 to 0.04 m/s.…”

Section: Particle Size Distributionmentioning

confidence: 99%

Filtration modelling in wall-flow particulate filters of low soot penetration thickness

Serrano

Climent

Angiolini

2016

Energy

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Wall-flow particulate filters are the basis to meet particulate emission standards concerning number and mass limits. The required balance between filtration efficiency and pressure drop demands the availability of computational tools able to predict and diagnose their combined response. In this paper a filtration model coupled with a gas dynamic particulate filter (PF) model based on the theory of packed beds of spherical particles is presented. The model takes as main assumption the experimentally well-known low soot penetration inside the porous wall. From this basis the description of the changes in filtration efficiency, pressure drop and deposits distribution are approached as a function of the soot loading level. The soot penetration inside the porous wall is shown to be a critical parameter dependent on the Peclet number. The transition from deep bed to cake filtration regime is also analysed accounting for macro-and micro-scale transition. Finally, the model is validated against experimental data obtained from several PFs. Flow properties advection along channels and the appropriate definition of the soot penetration and deposition dynamics lead to great accuracy in the modelling of the filtration efficiency, both overall and as a function of the particle size, as well as pressure drop.

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Section: Particle Size Distributionmentioning

confidence: 99%

Filtration modelling in wall-flow particulate filters of low soot penetration thickness

Serrano

Climent

Angiolini

2016

Energy

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“…This can be attributed to the inertial circulation effects of a fluid collecting sphere (Jung and Lee, 1998). It should also be noted that Equation (8) is valid only in cases in which the different mechanisms are strictly independent (Ramarao et al, 1994;Marre and Palmeri, 2001;Marre et al, 2004). The most penetrating particle size can then be acquired via the differentiation of Equation (7) with regard to particle size, with the resultant value used to establish a value of zero (i.e.…”

Section: Most Penetrating Particle Sizementioning

confidence: 99%

Approximated Solution for The Most Penetrating Particle Size in Multiple Fluid Sphere Systems

Jung

Lee

2007

Environmental Engineering Science

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There exists an intermediate size of particles, normally refereed to as most penetrating particle size, at which particles are least influenced by any collection mechanisms. The maximum aerosol penetration regime can occur where Brownian diffusion plus either gravitation or interception are the operant controlling mechanisms. In this study, a simplified approximated solution was obtained with regard to the most penetrating particle size in multiple fluid sphere systems. The harmonic mean type solution was approximated, and the results were then compared with the numerical solutions. Finally, minimum collection efficiency was calculated from the obtained solution for the most penetrating particle size. The simplified approximated solution is very consistent with the numerically calculated solution, for solid, bubble, and liquid fluid sphere systems. Consequently, this study showed that the general type-solutions were analytically approximated for both most penetrating particle size and minimum collection efficiency in multiple fluid spheres systems.

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“…where N g is the slip parameter (Dl g /r 0 ), l g is the slip length (D1.126λ; Marre et al 2004), and λ is the mean free path of gas molecules (0.065 mm for air). If the slip effects are negligible, Equation (8) can be expressed as E R D (2N R ) 2 , which is consistent with Equation 7.…”

Section: Theoretical Calculationmentioning

confidence: 99%

Surface-collection efficiency of Nuclepore filters for nanoparticles

Ogura

Kotake

Honda

2016

Aerosol Science and Technology

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The flat surface of Nuclepore filters is suitable for observing collected particles with a scanning electron microscope (SEM). However, experimental data on surface-collection efficiency are limited because surface-collection efficiencies cannot be measured directly using aerosol measuring instruments. In this study, the surface-collection efficiencies of Nuclepore filters were determined by establishing the ratio of the number of particles deposited on the surface of the filter visually counted with an SEM to the number of inflow particles counted by a condensation particle counter, using monodispersed polystyrene latex particles (30-800 nm) and silver particles (15-30 nm). Because Nuclepore filters with smaller pore sizes would be expected to produce higher minimum surface-collection efficiency and a higher pressure-drop, 0.08 and 0.2 mm Nuclepore filters were chosen as the test filters in view of both collection efficiency and pressure drop. The results showed that the minimum surface-collection efficiencies of the 0.08 mm pores at face velocities of 1.9 and 8.4 cm¢s ¡1 were approximately 0.6 and 0.7, respectively, and those of the 0.2 mm pores at face velocities of 1.5 and 8.6 cm¢s ¡1 were approximately 0.8 and 0.6, respectively. Because the pressure drop of the 0.2 mm pore filter was lower than that of the 0.08 mm pore filter under the same flowrate conditions, the 0.2 mm pore filter would be more suitable considering the pressure drop and collection efficiency. The obtained surface collection efficiencies were quantitatively inconsistent with theoretical surface-collection efficiencies calculated using conventional theoretical models developed to determine the collection efficiency of filters with larger pores.

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Modeling of submicrometer aerosol penetration through sintered granular membrane filters

Cited by 14 publications

References 48 publications

Filtration modelling in wall-flow particulate filters of low soot penetration thickness

Filtration modelling in wall-flow particulate filters of low soot penetration thickness

Approximated Solution for The Most Penetrating Particle Size in Multiple Fluid Sphere Systems

Surface-collection efficiency of Nuclepore filters for nanoparticles

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