Effect of nozzle spacing in the formation of primary and secondary deposits in multi-nozzle inertial impactors part II: Numerical study.

García-Ruiz, Estíbaliz; Romay, Francisco J.; García, José María González; Iza, J.; Cambra, J.F.; Gangoiti, Gotzon; Legarreta, J.A.

doi:10.1016/j.jaerosci.2019.06.009

Cited by 9 publications

(13 citation statements)

References 39 publications

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“…However, it changes to be a “ring” when Re = 700 for stk = 0.25 in Figure 3 b. Similarly, there are the primary ring and another ring in the previous research [ 7 , 10 ]. Halo deposit which is ring-shaped was also mentioned in the experimental results [ 8 , 11 ].…”

Section: Resultssupporting

confidence: 68%

“…Figure 11 shows the categorization of two particle deposition patterns (i.e., “halo” and “ring”) in terms of the value of Re and stk . The solid points and hollow points were taken from present simulations and experiment results from papers [ 4 , 7 , 10 , 11 , 12 ], respectively. A “halo” rarely occurs when Re is larger than 1000.…”

Section: Resultsmentioning

confidence: 99%

“…The particle number was reduced in the primary impaction zone with the increasing particle size due to the bounce effect. García-Ruiz et al [ 7 ] thought the formation of halo deposits was related to particle inertia and gravity. However, the halo deposits should be avoided in the impactor, if possible, since the collection of particles in the “halo” relies on the size of the collection plate.…”

Section: Introductionmentioning

confidence: 99%

“…Several mechanisms have been proposed through analysis of experiment results to explain the formation of the “halo” deposits, such as gravitational sedimentation, the hydrodynamic effect, particle inertia, Magnus lift, Saffman lift, and particle rebound and re-entrainment in most researches [ 6 , 7 , 8 , 9 , 10 , 11 ]. The combined method of computational fluid dynamics and discrete particle method (CFD-DPM) considered a powerful and reliable technique was utilized to simulate particle movement in the impactor to achieve the location of particle deposition [ 12 ].…”

Section: Introductionmentioning

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: Resultssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…In the multi-nozzle impactor, the secondary deposit of particles due to the jet interaction leads to the differences between the theoretical and experimented collection efficiencies and the less sharp collection efficiency and lower Stk (Rocklage J.M. et al, 2013;García-Ruiz E. et al, 2019).…”

Section: Brief Description Pros and Cons Typical Devices Referencesmentioning

confidence: 99%

Inertial Impaction Technique for the Classification of Particulate Matters and Nanoparticles: A Review

Tsai

2021

KONA

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Inertial impactors are applied widely to classify particulate matters (PMs) and nanoparticles (NPs) with desired aerodynamic diameters for further analyses due to their sharp cutoff characteristics, simple design, easy operation, and high collection ability. A few hundred papers have been published since the 1860s that addressed the characteristics and applications of the inertial impactors. In the last 30 years, our group has also carried out lots of studies to contribute to the design and the improvement of inertial impactors. With our understanding of inertial impactors, this article reviews previous studies of some typical types of the inertial impactors including conventional impactors, cascade impactors, and virtual impactors and the parameters for design consideration of these devices. The article also reviews some applications of the inertial impactors, which are mass concentration measurement, mass and number distribution measurement, personal exposure measurement, particulate matter control, and powder classification. The synthesized knowledge of the inertial impactor in this study can help researchers to design an inertial impactor with an accurate cutoff diameter, a sharp collection efficiency curve, and no particle bounce and particle overloading effects for long-term use for PM classification and control purposes.

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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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Effect of nozzle spacing in the formation of primary and secondary deposits in multi-nozzle inertial impactors part II: Numerical study.

Cited by 9 publications

References 39 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

Inertial Impaction Technique for the Classification of Particulate Matters and Nanoparticles: A Review

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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