Surface-Contact Mechanics During Oblique Impact of Microspheres with Planar Surfaces

Dunn, Patrick F.; Brach, Raymond M.; Janson, Gregory G.

doi:10.1080/02786829608965409

Cited by 23 publications

(9 citation statements)

References 10 publications

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“…These include the normal-incidence impact experiments of Dahneke (1973Dahneke ( , 1975, Wall et al (1990), Dunn, Brach, and Caylor (1995), and Li, Dunn, and Brach (1999), and the oblique-incidence experiments of Dunn, Brach, and Janson (1996), . Also included are the experimental results of Gorham and Kharaz (2000) who carried out normal and oblique experiments showing plastic effects.…”

Section: Experimental Validation Of the Modelmentioning

confidence: 99%

“…8 illustrates the measured and calculated normal coefficients of restitution and impact ratios for oblique impact. The data were obtained by Dunn et al (1996) and Li et al (2000) for SiO 2 surfaces and stainless steel particles with a mean diameter of 70 m. In the model used for comparison, it is assumed that coefficient of friction is constant and that the initial angular velocity of particles, , is equal to zero. In the case of the normal impact (when i = 90 • ), no tangential force will develop and, thus, = 0.…”

Section: Ea Validation Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

A microsphere-surface impact model for implementation in computational fluid dynamics

Kim

Dunn

2007

Journal of Aerosol Science

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Section: Experimental Validation Of the Modelmentioning

confidence: 99%

Section: Ea Validation Experimentsmentioning

confidence: 99%

A microsphere-surface impact model for implementation in computational fluid dynamics

Kim

Dunn

2007

Journal of Aerosol Science

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“…Rogers and Reed [4] experimentally measured the collision process of glass, copper, and stainless steel in different combinations and obtained the corresponding critical capture velocity. Dunn et al [5] carried out normal collision experiments to study the influence of the normal restitution coefficient of particles on the collision process. The results showed that for a smooth surface, the normal restitution coefficient of particles increased with the increase of incident velocity.…”

Section: Introductionmentioning

confidence: 99%

“…Dunn et al [5] carried out an experimental study on micron-sized particles obliquely impacting the flat surface. For smooth surfaces, the tangential effect of particles impacting the flat surface was enhanced by the spin of particles and the surface roughness of the flat surface, leading to the increase of the restitution coefficient of particles with the increase of the initial normal velocity at a small incident angle.…”

Section: Introductionmentioning

confidence: 99%

The Critical Capture Velocity of Coal Ash Particles Oblique Impact on a Stainless Steel Surface

Xie

et al. 2021

Energies

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In this paper, the rebound characteristics of coal ash particles impacting on a stainless steel surface are studied experimentally with the background of ash deposition on the heating surface of the boiler. The impact processes of coal ash particles with different incident angles were recorded by high-speed digital camera technology. The evolution of the normal restitution coefficient with incident normal velocity was obtained. Three different static contact theories are used to establish the equations of motion to predict the critical capture velocity of particles. The results show that the normal restitution coefficient first increases and then decreases with the increase of incident normal velocity. The critical capture velocity of particles under the three models was predicted. It is found that the prediction results of the Brach and Dunn (BD) model for the critical capture velocity are close to the experimental results. Taking the particle of size 23 μm as an example, the maximum critical capture velocity predicted by BD model is 1.0611 m/s at 0° incident angle. The minimum value is 0.7940 m/s when the incident angle is 45°.The critical capture velocity of particles decreases with the increase of incident angle and with the increase of particle diameter.

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“…Existing theoretical impact models developed to date have been primarily those involving monodisperse microspheres and perfectly-smooth surfaces. Few attempts have been conducted so far to simulate effects of surface irregularities on impact response, although Dunn et al (1996) have analyzed the signi cant in uence of surface roughness on the coef cient of restitution.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo Analysis of Polydisperse Microparticle Impacts with Surfaces

Dunn

Brach

2000

Aerosol Science and Technology

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ABSTRACT. The Monte Carlo method was applied to an impact model to investigate the impact of polydisperse microparticles with surfaces. The Monte Carlo results were compared to experiments. Two different situations were examined: the normal (90 ± ) impact of microspheres with a molecularly-smooth silicon surface, and the oblique (< 90 ± ) impact of microspheres with a Formica surface. In the former, the percentage of microspheres captured by the surface and the overall capture velocity distribution were determined given the statistical distribution of the microsphere diameters. In the latter, both the Formica surface roughness angles and the diameters of the microspheres were treated as statistical variables. The mean values of the Monte Carlo simulation of the coef cient of restitution and the impulse ratio were found to agree with the data at the 95% con dence level. Finally, this approach was applied to model the impact of Lycopodium spores with a Formica surface.

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Surface-Contact Mechanics During Oblique Impact of Microspheres with Planar Surfaces

Cited by 23 publications

References 10 publications

A microsphere-surface impact model for implementation in computational fluid dynamics

A microsphere-surface impact model for implementation in computational fluid dynamics

The Critical Capture Velocity of Coal Ash Particles Oblique Impact on a Stainless Steel Surface

Monte Carlo Analysis of Polydisperse Microparticle Impacts with Surfaces

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