The study of various mechanisms of in-cloud scavenging of large, moderately large, and small aerosol particles

Yalamov, Yu. I.; Vasiljeva, L.Yu; Schukin, E.R.

doi:10.1016/0021-9797(77)90101-1

Cited by 8 publications

(7 citation statements)

References 5 publications

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“…tion mechanisms A knowledge gap observed by Kim et al (2001), was the lack of experimental test to validate the numerous theoretical studies carried out on the PM collection by wet scrubbing. As a result, prior studies have come to the conclusion that the impaction mechanism is the dominant particle removal mechanism for PM greater than 5.0 mm while Brownian diffusion is believed to be dominant for "small" PM (Lim, Lee, and Park 2006;Kim et al 2001;Gemci and Ebert 1992;Yalamov, Vasiljeva, and Schukin 1977). As represented in our experimental results (Figure 3), the impaction-dominant region can occur at much smaller PM range.…”

Section: Contributions Of the Various Particle Collec-supporting

confidence: 67%

“…Due to their negligible masses, the fine particles undergo diffusion movement and are captured by the liquid droplets. According to Yalamov, Vasiljeva, and Schukin (1977), the collection by Brownian diffusion mechanism occurs for particle sizes lower than 100 nm. Numerous authors (Zhao and Zheng 2008; Schnelle and Brown 2002;Pilat and Prem 1976;Johnstone and Roberts 1949) have observed that Brownian diffusion is one of the main particle collection mechanisms in wet scrubbers.…”

Section: Modeling Of Particle Collection By Scrubbermentioning

confidence: 99%

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Spray scrubber for nanoparticle removal from incineration fumes from the incineration of waste containing nanomaterials: Theoretical and experimental investigations

Adah

Joubert

Boudhan

et al. 2021

Aerosol Science and Technology

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Nanomaterials (NMs) are currently treated via recycling, incineration and/or landfilling at their end-of-life. Little is known about the fate of NMs in incineration systems and the efficiency of the available flue-gas cleaning technologies (FGCT) in these systems on the removal of NMs before stack release. In combination with other FGCT such as cyclones, electrostatic precipitator or bag filters, scrubbers participate to limit the release of particulate matter (PM) into the atmosphere. No study has been carried out to investigate wet scrubber collection efficiency regarding nanoparticles under conditions found in a waste incineration plant. In the present study, experimental campaigns were carried out to quantify the performance of a pilot-scale spray scrubber regarding the removal of nanoparticles. The pilot was designed with respect to geometrical, hydrodynamic and residence time scale similitude and operated in gas temperature and humidity conditions representative of full-scale scrubbers in hazardous waste incineration plants. A collection efficiency of 45-62% for a particle size range of 12-90 nm was reported. To evaluate the experimental results, an existing PM collection model based on the 3 main particle collection mechanisms of diffusion, interception and impaction, was adapted for extreme humidity and gas temperature conditions typical of a waste incineration plant. A comparison of the experimental and theoretical results was made indicating that the model results were in good agreement with the experimental results. Contrary to prior studies, the impaction-dominant region occurred at smaller particle sizes (0.1-0.2 mm) corresponding to Stokes number 9 Â 10 À3 to 4 Â 10 À2 . Numerically, the contribution of the interception mechanism in the collection of nanoparticles (particle sizes 1-100nm) was found to be negligible (i.e., Interception number 2 Â 10 À5 to 2 Â 10 À3 ).

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Section: Contributions Of the Various Particle Collec-supporting

confidence: 67%

Section: Modeling Of Particle Collection By Scrubbermentioning

confidence: 99%

Spray scrubber for nanoparticle removal from incineration fumes from the incineration of waste containing nanomaterials: Theoretical and experimental investigations

Adah

Joubert

Boudhan

et al. 2021

Aerosol Science and Technology

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“…1998) the location of the soot-shell structure is expected to be determined by the inwardly directed thermophoretic forces which balance the outwardly directed drag forces acting on soot agglomerates. Earlier thermo-and di¬usiophoretic e¬ects were incorporated into the theoretical model of in-cloud scavenging of large, moderately large and small aerosol particles by Yalamov et al . (1977), who showed that thermo-and di¬usiophoresis dominate Brownian di¬usion for large and moderately large aerosol particles.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermo– and diffusiophoretic forces on the motion of flame-generated particles in the neighbourhood of burning droplets in microgravity conditions

Ben‐Dor

Elperin

Krasovitov

2003

Proc. R. Soc. Lond. A

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Numerical analysis of the e¬ect of thermo-and di¬usiophoretic forces on the motion of moderately large (0:01 . Kn . 0:3) combustion-generated (soot) particles and on the formation of soot-shell structure in the buoyancy-free spherical droplet ®ames is performed. Transient evaporation, ignition and combustion of a single sootingfuel droplet immersed into a quiescent hot environment are considered, taking into account the e¬ects of radiative heat losses, variable transport properties and the dependence of the droplet surface temperature on time. Results of numerical calculations are compared with available experimental data and recent theoretical models. We calculated thermo-and di¬usiophoretic and total velocities of combustiongenerated particles and showed that soot particles form a size-segregated soot-shell structure. Within a soot shell the particles with smaller radii are located closer to the droplet surface, while larger particles are located closer to the ®ame front. Numerical calculations performed for moderately large soot particles showed that there are two equilibrium locations, where the total velocity is equal to zero, between the droplet and the ®ame front. It is found that one of the equilibrium locations is the point of unstable equilibrium and the other position is the point of stable equilibrium. We numerically determined the dependence of soot-shell-to-droplet-diameter ratios on the particle radius.

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“…Therefore, the particle collection efficiency by theoretical calculation is much higher than the experimental results. 22,[57][58][59][60][64][65][66][67]71,73,75,77,78 We suggest that the inconsistency between the theoretical calculation and the experimental results originates from the defects of the models. When evaporation occurs, a variety of collection mechanisms act together on particles.…”

Section: Overview Of Theoretical Work On Particlementioning

confidence: 76%

“…Table S1 shows four theoretical models of particle collection, namely, superposition model, target efficiency equation, trajectory model, and flux model. Slinn et al, 57 Young, 58 and Yalamov et al 59 first determined the particle collection rate by simply superimposing the particle collection numbers of different mechanisms, including turbulent diffusion, Brownian diffusion, phoretic force, and other mechanisms. The theoretical model is commonly known as the superposition model.…”

Section: Overview Of Theoretical Work On Particlementioning

confidence: 99%

Mechanism of Stefan Flow in the Collection of Particles on Evaporating/Condensing Surfaces: A Review

Gan

Zhang

Nie

et al. 2021

Ind. Eng. Chem. Res.

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Evaporation and condensation are important in the field of heat and mass transfer. Particle collection by an evaporating or condensing surface is an interesting phenomenon. The Stefan flow generated on the phase change surface has a significant effect on the movement of particles. The transport mechanism of Stefan flow in previous studies lacks a systematic review. This study introduces the Stefan flow mechanism in particle collection, and the different theoretical models of particle collection are systematically summarized. The differences between the theoretical calculation and the experimental results of the effect of the phoretic forces (thermophoresis and Stefan flow) in particle collection on evaporating/condensing surfaces are pointed out. The variations are discussed from the viewpoint of Stefan flow. This study also emphasizes that Stefan flow on the condensing surface may become an important mechanism to further improve the particle collection efficiency.

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The study of various mechanisms of in-cloud scavenging of large, moderately large, and small aerosol particles

Cited by 8 publications

References 5 publications

Spray scrubber for nanoparticle removal from incineration fumes from the incineration of waste containing nanomaterials: Theoretical and experimental investigations

Spray scrubber for nanoparticle removal from incineration fumes from the incineration of waste containing nanomaterials: Theoretical and experimental investigations

Effect of thermo– and diffusiophoretic forces on the motion of flame-generated particles in the neighbourhood of burning droplets in microgravity conditions

Mechanism of Stefan Flow in the Collection of Particles on Evaporating/Condensing Surfaces: A Review

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