Nonlinear granular electrostatics

Siu, Theo; Pittman, Will; Cotton, Jake; Shinbrot, Troy

doi:10.1007/s10035-015-0550-8

Cited by 12 publications

(13 citation statements)

References 13 publications

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“…On conducting grounded walls, however, particles with both polarities may be attracted on the wall due to the image charge effect (Song & Mehrani 2017). Other factors such as dielectrophoresis are likely required to explain formation of a motionless particle structures: on close approach, dielectrophoretic forces can pull same-polarity particles with different charge magnitudes together (LaMarche et al 2010;Liu et al 2010;Lee et al 2015;Siu et al 2015). In addition to dielectrophoresis, polarization is likely to have a direct effect on triboelectric charging.…”

Section: Conducting Wallmentioning

confidence: 99%

“…Furthermore, it has been shown by Lee et al (2015) that nearly monodisperse particles exhibit a fairly narrow charge distribution, making this mechanism unlikely for monodisperse particles. Dielectrophoresis has been shown to affect particle agglomeration (LaMarche et al 2010;Liu et al 2010;Lee et al 2015;Siu et al 2015) and might also play an important role in wall sheeting.…”

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confidence: 99%

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Experimental and numerical study of wall layer development in a tribocharged fluidized bed

Sippola

Kolehmainen

Özel³

et al. 2018

J. Fluid Mech.

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The effects of triboelectricity in a small-scale fluidized bed of polyethylene particles were investigated by imaging the particle layer in the vicinity of the column wall and by measuring the pressure drop across the bed. The average charge on the particles was altered by changing the relative humidity of the gas. A triboelectric charging model coupled with a computational fluid dynamics-discrete element method (CFD-DEM) model was utilized to simulate gas-particle flow in the bed. The electrostatic forces were evaluated based on a particle-particle particle-mesh method, accounting for the surface charge on the insulating walls. It was found that simulations with fixed and uniform charge distribution among the particles capture remarkably well both the agglomeration of the particles on the wall and the associated decrease in the pressure drop across the bed. With a dynamic tribocharging model, the charging rate had to be accelerated to render the computations affordable. Such simulations with an artificial acceleration significantly over-predict charge segregation and the wall becomes rapidly sheeted with a single layer of strongly charged particles.

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Section: Conducting Wallmentioning

confidence: 99%

mentioning

confidence: 99%

Experimental and numerical study of wall layer development in a tribocharged fluidized bed

Sippola

Kolehmainen

Özel³

et al. 2018

J. Fluid Mech.

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“…In previous work, Siu et al [24] investigated the behavior of granular materials in strong electric fields. They found that applied fields can cause particles to produce novel behaviors ranging from static columns to moving ribbons that are not explained by static charges alone.…”

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confidence: 99%

Effects of Polarization on Particle-Laden Flows

Kolehmainen

Özel

et al. 2018

Phys. Rev. Lett.

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“…However, our study, we believe, will be helpful in clarifying very basic feature of natural processes which produce dust aggregation in charged environments e.g., the agglomeration of planetary dust [25] and cohesive powder substructures [27]. In the perspective of planetary dust aggregation, it will also be interesting to include the effects due to drag caused by interstitial gas surrounding the particles, dipolar effects [4,59], as well as van der Waals effects [25].…”

Section: Discussionmentioning

confidence: 99%

Early-stage aggregation in three-dimensional charged granular gas

Singh

Mazza

2018

Phys. Rev. E

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Neutral grains made of the same dielectric material can attain considerable charges due to collisions and generate long-range interactions. We perform molecular dynamic simulations in three dimensions for a dilute, freely-cooling granular gas of viscoelastic particles that exchange charges during collisions. As compared to the case of clustering of viscoelastic particles solely due to dissipation, we find that the electrostatic interactions due to collisional charging alter the characteristic size, morphology and growth rate of the clusters. The average cluster size grows with time as a power law, whose exponent is relatively larger in the charged gas than the neutral case. The growth of the average cluster size is found to be independent of the ratio of characteristic Coulomb to thermal energy, or equivalently, of the typical Bjerrum length. However, this ratio alters the crossover time of the growth. Both simulations and mean-field calculations based on the Smoluchowski's equation suggest that a suppression of particle diffusion due to the electrostatic interactions helps in the aggregation process.

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Nonlinear granular electrostatics

Cited by 12 publications

References 13 publications

Experimental and numerical study of wall layer development in a tribocharged fluidized bed

Experimental and numerical study of wall layer development in a tribocharged fluidized bed

Effects of Polarization on Particle-Laden Flows

Early-stage aggregation in three-dimensional charged granular gas

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