Measurements of Kinetic Energy Loss for Particles Impacting Surfaces

Wall, Stephen; John, Walter; Wang, Hwa-Chi; Goren, Simon L.

doi:10.1080/02786829008959404

Cited by 240 publications

(174 citation statements)

References 26 publications

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“…Hence the asymptote has a value of (k p /k e ) 1/2 [14]. This asymptotic behaviour is not in line with the experimental evidence [27,28], where it is shown that at sufficiently high velocity the impact energy far exceeds the adhesion energy and the coefficient of restitution is primarily a function of the energy loss due to plastic deformation.…”

Section: Comparison Of the Proposed Model With That Of Thornton And Nmentioning

confidence: 77%

“…In order to define the dynamics of the process, the dimensionless shear strain rate,γ , of Tardos et al [29] is evaluated using Eq. (27), (27) where γ is the shear strain rate, d p is the mean particle diameter and g is the gravitational acceleration. The strain rate of 0.28 s −1 provides a dimensionless shear strain rate of ∼0.003.…”

Section: Sensitivity Analysis Of the Proposed Model Parametersmentioning

confidence: 99%

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A linear model of elasto-plastic and adhesive contact deformation

et al. 2014

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Rigorous non-linear models of elasto-plastic contact deformation are time-consuming in numerical calculations for the distinct element method (DEM) and quite often unnecessary to represent the actual contact deformation of common particulate systems. In this work a simple linear elasto-plastic and adhesive contact model for spherical particles is proposed. Plastic deformation of contacts during loading and elastic unloading, accompanied by adhesion are considered, for which the pull-off force increases with plastic deformation. Considering the collision of a spherical cohesive body with a rigid flat target, the critical sticking velocity and coefficient of restitution in the proposed model are found to be very similar to those of Thornton and Ning's model. Sensitivity analyses of the model parameters such as plastic, elastic, plastic-adhesive stiffnesses and pulloff force on work of compaction are carried out. It is found that by increasing the ratio of elastic to plastic stiffness, the plastic component of the total work increases and the elastic component decreases. By increasing the interface energy, the plastic work increases, but the elastic work does not change. The model can be used to efficiently represent the forcedisplacement of a wide range of particles, thus enabling fast numerical simulations of particle assemblies by the DEM.

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Section: Comparison Of the Proposed Model With That Of Thornton And Nmentioning

confidence: 77%

Section: Sensitivity Analysis Of the Proposed Model Parametersmentioning

confidence: 99%

A linear model of elasto-plastic and adhesive contact deformation

et al. 2014

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“…However, three of those experiments seem to have some relevance for astrophysical applications. The work of Wall et al (1990) deals with a variety of target materials including silicon. These authors used quite small spheres down to 2.58 km diameter.…”

Section: Previous W Ork On Small-particle Collisionsmentioning

confidence: 99%

Analogous Experiments on the Stickiness of Micron‐sized Preplanetary Dust

Poppe

Blum

Henning

2000

ApJ

208

189

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In the early solar nebula, the formation of planetesimals and cometesimals is believed to be due to inelastic collisions of initially micron-sized grains. The collisions are caused by relative velocities due to size-dependent interactions with the surrounding dilute gas. The grain growth process is determined by the velocity-dependent sticking efficiency upon collisions. Therefore, we performed experiments with eight samples of micron-sized particles consisting of monodisperse silica spheres, of irregularly shaped diamond, enstatite, and silicon carbide grains, and of silicon carbide whiskers. We determined the sticking probability and the energy loss upon bouncing collisions by studying individual grain-target collisions in vacuum. We found a sticking probability higher than predicted by previous theoretical work. Grain size, roughness, and primarily grain shape, i.e., the di †erence of spherical versus irregular grain shape, is important for the collisional behavior, whereas the material properties are rather unimportant. Our results indicate that the preplanetary dust aggregation is more e †ective than previously thought.

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“…Physical properties of particles, such as hygroscopicity, size, density, phase, elasticity, and hardness, play an important role in particle bounce behavior (Wall et al 1990;Stein et al 1994;Matthew et al 2008;Virtanen et al 2010;Virtanen et al 2011;Bateman et al 2014). Hygroscopic particles, such as salts, are known to have much less bounce than non-hygroscopic particles (Stein et al 1994).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Particle Bounce in Various Collection Substrates to be Used as Vaporizer in Aerosol Mass Spectrometer

Kang

Cho

Kwak

et al. 2015

Aerosol Science and Technology

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The determination of the collection efficiency (CE) of particles during transport, vaporization, and ionization in the aerosol mass spectrometer (AMS), which uses vaporizer to evaporate non-refractory particles with subsequent ionization, is important for accurately quantifying the concentrations of chemical constituents. Particle bounce in the vaporizer can be considered as one of the most important parameters influencing the CE of particles. Substrates with various shapes (flat, cylindrical, reverse-conical, cup, trapezoidal, and reverse-T), materials (stainless steel, copper, tungsten, and molybdenum), pores with average sizes of 0.2, 1, 5, 20, and 100 mm, and mesh with a size of 79 mm, which can be a possible candidate for the vaporizer in the AMS, were constructed. Bounce fractions of sub-micrometer particles (polystyrene latex, oleic acid, and dioctyl phthalate) were determined using the differential mobility analyzer (DMA)-impactor technique under a constant impact velocity. For the porous substrate, the particle bounce fraction significantly decreased with increasing pore size and porosity, but there was an upper limit for the pore size above which the particle bounce fraction no longer decreased significantly (i.e., the rebounded particles successfully escaped from the pores). The mesh substrate also had a lower particle bounce fraction than the flat substrate. Among the tested materials, the copper substrate having the lowest hardness and elasticity had the lowest particle bounce fraction. In addition, the reverse-T shape substrate having more available surfaces for particle entrapment led to the reduction of particle bounce fraction. In terms of phase, the liquid particles had lower particle bounce fractions than the solid particles. Our results suggest that the vaporizer in the AMS should provide traps for multiple collisions of the rebounding particles with an appropriate porosity or mesh and should be made of lowhardness materials to minimize particle bounce.

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Measurements of Kinetic Energy Loss for Particles Impacting Surfaces

Cited by 240 publications

References 26 publications

A linear model of elasto-plastic and adhesive contact deformation

A linear model of elasto-plastic and adhesive contact deformation

Analogous Experiments on the Stickiness of Micron‐sized Preplanetary Dust

Evaluation of Particle Bounce in Various Collection Substrates to be Used as Vaporizer in Aerosol Mass Spectrometer

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