The adhesion of dust particles

Jordan, D W

doi:10.1088/0508-3443/5/s3/363

Cited by 65 publications

(20 citation statements)

References 5 publications

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“…Resuspension may involve rolling or sliding (Jordan 1954;Hinds 1999). However, the rolling detachment is the dominant mechanism for particle removal in turbulent flows (Zhang and Ahmadi 2000;Ibrahim et al 2003).…”

Section: Discussionmentioning

confidence: 99%

“…Jordan (1954) raised the importance of changing the surface roughness for particle detachment. Qian and Ferro (2008) concluded that hard floor could be a better choice than carpet for reducing particle resuspension.…”

Section: Introductionmentioning

confidence: 99%

“…Resuspension may involve rolling or sliding motion (Jordan 1954). Ibrahim et al (2003) undergo pure rolling along the surface before possible entrainment and this sweeping motion plays a role in the detachment process.…”

Section: Introductionmentioning

confidence: 99%

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High Resolution Study of Micrometer Particle Detachment on Different Surfaces

Kassab

Ugaz

King

et al. 2013

Aerosol Science and Technology

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In an effort to identify particle initial motion prior liftoff interactions of micrometer glass beads (10-100 µm) on glass, ceramic, and hardwood substrates were investigated experimentally. Particles were deposited on the lower surface of a 10 cm 2 wind tunnel by gravitational settling. Air flows were imposed from an open entrance at average velocities up to 16 m/s. Individual particle trajectories obtained by high-speed imaging reveal three different types of motion: rolling/bouncing (saltation caused by the movement of hard particles over an uneven surface in a turbulent flow of air), immediate liftoff (particles completely leave the surface with no or minimal initial rolling/bouncing) and complex motion (particles travel with rolling/bouncing motion on the surface for a certain distance before final liftoff). Surface roughness significantly affects the particle initial motion prior to liftoff. The majority of particle trajectories from the glass substrate were parallel to the surface with complex motion. Hardwood substrates took the longest time for initial particle movement (t >1 s) causing a more rapid liftoff. The ceramic substrate showed the most rolling/bouncing motion, for 80% of the particles. The detachment percentage initially follows an exponentially increasing trend for a period of ∼1 s, followed by a plateau phase for a period of 5 s. Changing the velocity, substrate, and particle size significantly affects particle detachment. Incorporating the different types of particle motion prior to liftoff into detachment mode models, and understanding how their relative contributions change with different particle and substrate materials, can potentially yield improved predictive capabilities.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Resolution Study of Micrometer Particle Detachment on Different Surfaces

Kassab

Ugaz

King

et al. 2013

Aerosol Science and Technology

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“…a Marple et al (1991); b Marjamaki et al (2000). adhesion because of capillary forces associated with adsorbed water on the particle and the impaction plate, thereby increasing the threshold impact kinetic energy for particle rebound (Jordan 1954;Winkler 1974;Wang and John 1987). No quantitative estimate, however, was made of the associated capillary forces.…”

Section: Introductionmentioning

confidence: 99%

Impactor Apparatus for the Study of Particle Rebound: Relative Humidity and Capillary Forces

Bateman

Belassein

Martin

2013

Aerosol Science and Technology

107

130

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The effect of relative humidity (RH) on the adhesion of particles colliding with a hard surface was studied for submicron particles of liquid oleic acid, solid ammonium sulfate, and solid polystyrene latex (PSL). For this purpose, a three-arm impactor was designed and constructed. The three arms consisted of one impactor having an uncoated impaction plate (i.e., a rebound arm), one impactor having a viscous-liquid-coated impaction plate (i.e., a capture arm), and one impactor having no impaction plate (i.e., a null arm). The particle number concentrations downstream of each arm were measured by condensation particle counters (CPCs). Data were analyzed to obtain the particle rebound fraction. Use of ambient upstage pressure allowed measurements from 5 to 95% RH at the impaction plate. Particle rebound depended strongly on RH, even for non-hygroscopic PSL particles. The rebound fraction for PSL particles dropped monotonically from nearly unity at 50% RH to 0.4 at 95% RH. For ammonium sulfate, the rebound fraction dropped from nearly unity at 25% RH to 0.5 at 70% RH. The decreased rebound at higher RH was explained by the formation of a water meniscus. The resulting capillary forces inhibited particle detachment. A model, taking into account the impact kinetic energy compared to the contact adhesion energy arising from van der Waals and capillary forces, captured the observations well. The reduced rebound arising from increased adhesion at high RH, independent of particle water content, potentially confounds a recent assumption that non-rebounding atmospheric particles are liquid.

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“…By increasing the velocity of the air‐stream in subsequent stages of the sampler, smaller and smaller particles are deposited [ 20]. During the last 50 years, impaction characteristics have been studied theoretically [ 21–23] and experimentally [ 24–31]. It has been shown repeatedly that under certain conditions, the collection efficiency is unsatisfactory.…”

Section: Introductionmentioning

confidence: 99%

Differences in size selective aerosol sampling for pollen allergen detection using high‐volume cascade impactors

Riediker¹,

Koller²,

Monn³

2000

Clin Experimental Allergy

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The observed bounce and blow-off of pollen without a greased stage 2 leads to serious mistakes when assessing the allergen content of the fractions collecting particles smaller than intact pollen, i.e., below 10.2 micrometer. Pollen allergen concentrations in respirable particle fractions are much lower than in the pollen size fraction. This is of great importance both for symptoms of sensitized allergic asthmatics and for research of asthma-related mechanisms.

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The adhesion of dust particles

Cited by 65 publications

References 5 publications

High Resolution Study of Micrometer Particle Detachment on Different Surfaces

High Resolution Study of Micrometer Particle Detachment on Different Surfaces

Impactor Apparatus for the Study of Particle Rebound: Relative Humidity and Capillary Forces

Differences in size selective aerosol sampling for pollen allergen detection using high‐volume cascade impactors

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