Enhancement of collection efficiency of inertial impactors using elliptical concave impaction plates

Kim, Young‐Jun; Yook, Se-Jin

doi:10.1016/j.jaerosci.2011.08.006

Cited by 16 publications

(10 citation statements)

References 21 publications

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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%

“…Furthermore, a study has been conducted by varying impaction plate geometry to improve collection efficiency (Tsai and Cheng, 1995). The cut-off size of an inertial impactor was reduced by using an impaction plate with a concave elliptical surface to decrease particle bounce (Kim and Yook, 2011;Kim et al, 2013). In order to capture smaller particles, a new stage was added between the last stage of the ELPI and the filter (Yli-Ojanperä et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Following the suggestions of Kim and Yook (2011), the 32 mm impaction plate shown in Figure 2 is offset into a counterbore by 3 mm. The sidewalls of this counter-bore are slightly angled to help further reduce particle loss by blow-off.…”

Section: Design Parameters Of the Basic Impactor Geometrymentioning

confidence: 99%

A Streamlined, High-Volume Particle Impactor for Trace Chemical Analysis

Staymates

Bottiger

Schepers

et al. 2013

Aerosol Science and Technology

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The design and characterization of a streamlined, high-volume particle impactor intended for use with trace chemical analysis is presented. The impactor has a single round jet and is designed to operate at a flow rate of 1000 L/min. Computational fluid dynamics (CFD) was used as a tool to optimize the aerodynamic performance of the impactor by iteratively redesigning the geometry and curvature of the internal walls. By eliminating recirculation zones within the flowfield of the impactor and using flowfield streamlines as new walls, successive designs revealed a significant reduction in the pressure drop across the impactor. Particle trajectories were simulated in the impactor and the 50% cutpoint was determined to be 1.05 µm. The impaction surface itself is easily removed from the body of the impactor assembly, potentially facilitating rapid trace chemical analysis using a variety of chemical detection techniques. A prototype impactor was fabricated with a 3D rapid prototyping printer and characterized in terms of particle cut-off diameter using test aerosols generated by an Ink Jet Aerosol Generator (IJAG) and fluorescence intensity measurements. The experimental particle cut-off diameter was not able to be measured because the smallest aerosol particles that could be tested were 1.86 µm which were collected at 100% efficiency. Particulate contamination from the high-explosive compound C4 was also collected with the impactor to demonstrate operational utility for trace explosives detection.

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“…Tsai and Cheng (1995) tested impaction plates of various shapes and showed that the particle bounce under heavy loading condition could be alleviated by modifying the impaction plate shape. Kim and Yook (2011) assumed the elliptical concave impaction plate and suggested the optimum range of the ratio of major axis length to minor axis length of the elliptical curvature, for reducing the cut-off size of the round-nozzle inertial impactor. These studies of Tsai and Cheng (1995) and Kim and Yook (2011) imply that the collection efficiency of inertial impactors could be enhanced by merely changing the impaction plate shape, that is, without varying the aerosol flow rate or nozzle size.…”

Section: Introductionmentioning

confidence: 99%

“…for a longer time compared to the particles floating over the flat impaction plate, as discussed by Kim and Yook (2011).…”

mentioning

confidence: 99%

Collection Efficiency of Rectangular Slit-Nozzle Inertial Impactors with Impaction Plates of Elliptical Concave Curvature

Kim

Yook

Ahn

2013

Aerosol Science and Technology

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In this study, the impaction plate with an elliptical concave groove was employed in an effort to enhance the collection efficiency of the slit-nozzle inertial impactor. The major axis length (A) and the minor axis length (B) of the elliptical concave curvature were varied. The effect of the ratio of A to B on the collection efficiency of slit-nozzle inertial impactors was investigated both numerically and experimentally. The numerical results were in good agreement with the experimental data for different values of A/B ratio. The elliptical concave impaction plates were useful in not only reducing the particle bounce but also lowering the cut-off size. The optimum range of the A/B ratio was found to exist for minimizing the cut-off size. When the elliptical concave impaction plates with the A/B ratio of 2 were used for the slit-nozzle inertial impactors, the square-root of the Stokes number was estimated to be lowered from 0.77 to approximately 0.6, resulting in the decrease of the cut-off size by 22% compared with the typical flat impaction plates.

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Enhancement of collection efficiency of inertial impactors using elliptical concave impaction plates

Cited by 16 publications

References 21 publications

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

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

A Streamlined, High-Volume Particle Impactor for Trace Chemical Analysis

Collection Efficiency of Rectangular Slit-Nozzle Inertial Impactors with Impaction Plates of Elliptical Concave Curvature

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