Investigation of collection efficiency of round-nozzle impactors at different atmospheric pressures and temperatures

Park, Chun-Woo; Kim, Gyuho; Yook, Se-Jin; Ahn, Kang‐Ho

doi:10.1016/j.apt.2015.02.014

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…The following assumptions were used for the continuous phase. On one hand, the flow is laminar [ 26 ], and there is no slip between particles and the wall surface. On the other hand, the flow is assumed to be incompressible when the Mach number is smaller than 0.3.…”

Section: Model Formulationmentioning

confidence: 99%

“…The model selected in this paper is based on the shape parameters of the electrical low-pressure impactor (ELPI) in the experiment [ 34 ] and the numerical study of a two-dimensional model [ 26 ]. In this study, a three-dimensional model was calculated to focus on the axial and radial changes of the flow field and particle movement.…”

Section: Numerical Proceduresmentioning

confidence: 99%

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CFD-DEM Coupling Model for Deposition Process Analysis of Ultrafine Particles in a Micro Impinging Flow Field

et al. 2022

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Gas with ultrafine particle impaction on a solid surface is a unique case of curvilinear motion that can be widely used for the devices of surface coatings or instruments for particle size measurement. In this work, the Eulerian–Lagrangian method was applied to calculate the motion of microparticles in a micro impinging flow field with consideration of the interactions between particle to particle, particle to wall, and particle to fluid. The coupling computational fluid dynamics (CFD) with the discrete element method (DEM) was employed to investigate the different deposition patterns of microparticles. The vortex structure and two types of particle deposits (“halo” and “ring”) have been discussed. The particle deposition characteristics are affected both by the flow Reynolds number (Re) and Stokes number (stk). Moreover, two particle deposition patterns have been categorized in terms of Re and stk. Finally, the characteristics and mechanism of particle deposits have been analyzed using the particle inertia, the process of impinging (particle rebound or no rebound), vortical structures, and the kinetic energy conversion in two-phase flow, etc.

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Section: Model Formulationmentioning

confidence: 99%

Section: Numerical Proceduresmentioning

confidence: 99%

CFD-DEM Coupling Model for Deposition Process Analysis of Ultrafine Particles in a Micro Impinging Flow Field

et al. 2022

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“…Based on simulation results with or without particle collection, the statistical Lagrangian particle-tracking (SLPT) model was used to calculate collection efficiency, as presented in Eq. (1) (Kim and Yook, 2011;Kim et al, 2014b;Lee et al, 2014;Park et al, 2015). Here, Δr = R in /(N in -1) is the distance between particles, R in is the inlet radius, N in is the number of particles arranged in the radial direction, r i = (i -1)Δr is the particle position in the radial direction from the center, i is the particle index and f i is the particle collection index.…”

Section: Methodsmentioning

confidence: 99%

Enhancement of Collection Efficiency of an Inertial Impactor Using an Additional Punched Impaction Plate

Cheon

Lee

Bae

et al. 2017

Aerosol Air Qual. Res.

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In this study, the collection efficiency of a round-nozzle inertial impactor was enhanced through use of an additional punched impaction plate. The additional plate was installed between the nozzle outlet and the existing impaction plate. To determine its effect, a simulation and an experiment were conducted. A parametric study was performed on a PM 2.5 inertial impactor to improve the optimum efficiency based on the hole diameter of the additional plate and its distance from the existing plate. As a result, the cut-off size was reduced by 27% from 2.52 µm to 1.84 µm. The effect of the additional punched impaction plate on PM 1 and PM 10 inertial impactors was also investigated. The improvement in efficiency could be observed even when the additional punched impaction plate had varying Reynolds numbers and nozzle sizes. Accordingly, the (Stk 50 ) 0.5 value was reduced by 25% from 0.49 to 0.37 by adding a punched impaction plate in a roundnozzle inertial impactor.

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Numerical study on the effect of nozzle-converging length on the aerosols collection efficiency and deposition on the impaction plate of a multi-nozzle inertial impactor

Golbazi,

Abbasalizadeh,

Ramezanpour

2024

Environ Monit Assess

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Investigation of collection efficiency of round-nozzle impactors at different atmospheric pressures and temperatures

Cited by 8 publications

References 18 publications

CFD-DEM Coupling Model for Deposition Process Analysis of Ultrafine Particles in a Micro Impinging Flow Field

CFD-DEM Coupling Model for Deposition Process Analysis of Ultrafine Particles in a Micro Impinging Flow Field

Enhancement of Collection Efficiency of an Inertial Impactor Using an Additional Punched Impaction Plate

Numerical study on the effect of nozzle-converging length on the aerosols collection efficiency and deposition on the impaction plate of a multi-nozzle inertial impactor

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