Granular flow and dielectrophoresis: The effect of electrostatic forces on adhesion and flow of dielectric granular materials

LaMarche, Keirnan R.; Muzzio, Fernando J.; Shinbrot, Troy; Glasser, Benjamin J.

doi:10.1016/j.powtec.2010.01.006

Cited by 28 publications

(19 citation statements)

References 48 publications

(57 reference statements)

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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%

“…In gas-solid and granular flows, triboelectric charging may cause particle agglomeration (LaMarche et al 2010;Lee et al 2015); affects particle entrainment rate (Fotovat et al 2017a;Fotovat, Grace & Bi 2017c;Yang et al 2017); affects bubble size and shape in bubbling fluidized beds (Jalalinejad, Bi & Grace 2012;Rokkam et al 2013); and leads to adhesion of particles to the walls (Hendrickson 2006;Sowinski, Mayne & Mehrani 2012;Salama et al 2013;Song & Mehrani 2017). For instance, this may result in wall sheeting seen in polymerization reactors that hinders the reactor performance (Hendrickson 2006).…”

mentioning

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.…”

mentioning

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%

mentioning

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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“…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. An experimental study of LaMarche et al [25] also showed that the electric field created by a tribocharged teflon sheet is enough to cause significant dielectrophoretic interactions, and suggested that triboelectrification present in granular flows could lead to similar effects. Furthermore, a recent article by Lee et al [26] investigated clustering of triboelectrically charged particles during free fall in vacuum and concluded that dielectrophoresis associated with particle charges plays an important role in particle dynamics and agglomerate formation.…”

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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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“…For a particle with irregular shape, the adhesive force is hard to be measured (LaMarche, Muzzio, Shinbrot, & Glasser, 2010;Packham, 2003).…”

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confidence: 99%

Biomechanical and Physiological Conditions Influence Erythrocytes - Erythrocyte Adhesion. An in vitro Study

Elblbesy¹

2017

APR

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Erythrocyte -erythrocyte adhesion (EEA) is of the large interest since it will effect directly on its function and interaction with other organs. Also, erythrocytes adhesion may arise erythrocytes aggregation which has a significant effect on the hemodynamic mechanism. The present study is aimed at examining the effect of erythrocytes mechanical properties on their adhesion. In addition, the impact of the physiological conditions around erythrocytes on their adhesion will be evaluated. A simple flow compartment technique built on inverted microscope was used to calculate adhesion number (AN) of erythrocytes which reflects the ability of erythrocytes to adhere to each other. AN was correlated strongly to shear rate and erythrocyte deformation index. Shape parameters of erythrocytes (Radius and volume) were found to play a major role in EEA. The concentration of the main plasma proteins (fibrinogen and albumin) were determined to have a significant effect on EEA. The results obtained in this study give the attention that other factors rather than particle diameter and work of adhesion may effect on erythrocytes adhesion.

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Granular flow and dielectrophoresis: The effect of electrostatic forces on adhesion and flow of dielectric granular materials

Cited by 28 publications

References 48 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

Biomechanical and Physiological Conditions Influence Erythrocytes - Erythrocyte Adhesion. An in vitro Study

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