The Role of Humidity on the Lift-off of Particles in Electric Fields

Sow, Mamadou; Widenor, Ross; Akande, A.R.; Robinson, K.; Sankaran, R. Mohan; Lacks, Daniel J.

doi:10.5935/0103-5053.20130035

Cited by 14 publications

(8 citation statements)

References 1 publication

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“…The physics of the electrostatic force acting on dust particles depends on the conductivity of the particles (Figure 1) (Jones 1995, Sow et al 2013, Kok and Renno 2006, von Holstein-Rathlou et al 2012, Nakajima and Matsuyama 2002. For conducting particles, the charge in an electric field is enhanced by the electrostatic induction.…”

Section: Electrostatic Forcementioning

confidence: 99%

“…The conductivity of dust grains is one of the essential properties of grains when considering their detachment (Sow et al 2013, von Holstein-Rathlou et al 2012, although previous models on spoke formation seem to have overlooked this issue. At the same time, the electric conductivity of icy particles is complicated because it significantly depends on the temperature, minor comportments, and the structural and dynamical properties of the surface of the icy particles, although water ice is an insulating material.…”

Section: Appendix B Conductivity Of Ring Particlesmentioning

confidence: 99%

See 1 more Smart Citation

Dust release from cold ring particles as a mechanism of spoke formation in Saturn's rings

Hirata¹,

Kimura²,

Ohtsuki³

2022

Icarus

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Section: Electrostatic Forcementioning

confidence: 99%

Section: Appendix B Conductivity Of Ring Particlesmentioning

confidence: 99%

Dust release from cold ring particles as a mechanism of spoke formation in Saturn's rings

Hirata¹,

Kimura²,

Ohtsuki³

2022

Icarus

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“…Sow et al [54] conducted a series of experiments on electrostatic projection of four types of spherical particles-aluminum, polytetrafluoroethylene (PTFE), nylon, and soda-lime glass-at low and high RH levels. Unlike the behavior of the aluminum and PTFE particles, which were consistent with the conducting-and insulatingparticle models, respectively, they surprisingly observed that nylon and soda-lime glass were projected according to the conducting-particle model at low RH levels and the insulating-particle model at high RH levels.…”

Section: Introductionmentioning

confidence: 99%

Physics of Electrostatic Projection Revealed by High-Speed Video Imaging

et al. 2020

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Processes based on electrostatic projection are used extensively in industry, e.g., for mineral separations, electrophotography, or manufacturing of coated abrasives, such as sandpaper. Despite decades of engineering practice, there are still unanswered questions. In this paper, we present a comprehensive experimental study of the projection process of more than 1500 individual spherical alumina particles with a nominal size of 500 μm, captured by high-speed video imaging and digital image analysis. Based on flight trajectories of approximately 1100 projected particles, we determine the acquired charge and dynamics as a function of the relative humidity (RH) and the electric field intensity and compare the results with classical theories. For RH levels of 50% and above, more than 85% of distributed particles are projected, even when the electric field intensity is at its minimum level. This suggests that, beyond a critical value of the electric field intensity, the RH plays a more critical role in the projection process. We also observe that the charging time is reduced dramatically for RH levels of 50% and above, possibly due to the buildup of thin water films around the distributed particles, which can facilitate charge transfer. In contrast, projected particles at the 30% RH level exhibit excessive amounts of electric charge, between 2 and 4 times than that of the saturation value, which might be attributed to triboelectric charging effects. Finally, the physics of electrostatic projection is compared and contrasted with those of induced-charge electrokinetic phenomena, which share similar field-square scaling, as the applied electric field acts on its own induced charge to cause particle motion.

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“…Sow et al [53] conducted a series of experiments on electrostatic projection of four types of spherical particles: aluminum, PTFE, Nylon R , and soda-lime glass at low and high RH levels. Unlike behaviors of aluminum and PTFE particles, which were consistent with conducting and insulating particle models, respectively, they surprisingly observed that Nylon R and soda-lime glass were projected according to conducting particle model at low RH level and insulating particle model at high RH level.…”

Section: Introductionmentioning

confidence: 99%

Physics of Electrostatic Projection Revealed by High-Speed Video Imaging

Sayyah,

Mirzadeh,

Jiang

et al. 2019

Preprint

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Processes based on electrostatic projection are used extensively in industry, e.g. for mineral separations, electrophotography or manufacturing of coated abrasives, such as sandpaper. Despite decades of engineering practice, there are still unanswered questions. In this paper, we present a comprehensive experimental study of projection process of more than 1500 individual spherical alumina particles with a nominal size of 500 µm, captured by high-speed video imaging and digital image analysis. Based on flight trajectories of approximately 1100 projected particles, we determined the acquired charge and dynamics as a function of relative humidity (RH) and electric field intensity and compared the results with classical theories. For RH levels of 50% and above, more than 85% of disposed particles were projected, even when the electric field intensity was at its minimum level. This suggests that, beyond a critical value of electric field intensity, relative humidity plays a more critical role in the projection process. We also observed that the charging time is reduced dramatically for RH levels of 50% and above, possibly due to the build-up of thin water films around the particles which can facilitate charge transfer. In contrast, projected particles at 30% RH level exhibited an excessive amount of electric charge, between two to four times than that of saturation value, which might be attributed to triboelectric charging effects. Finally, the physics of electrostatic projection is compared and contrasted with those of induced-charge electrokinetic phenomena, which share similar field-square scaling, as the applied field acts on its own induced charge to cause particle motion.

show abstract

The Role of Humidity on the Lift-off of Particles in Electric Fields

Cited by 14 publications

References 1 publication

Dust release from cold ring particles as a mechanism of spoke formation in Saturn's rings

Dust release from cold ring particles as a mechanism of spoke formation in Saturn's rings

Physics of Electrostatic Projection Revealed by High-Speed Video Imaging

Physics of Electrostatic Projection Revealed by High-Speed Video Imaging

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