Gas discharge caused by triboelectricity around a contact during friction between insulators

Miura, Takashi; Arakawa, Ichiro

doi:10.1109/tdei.2007.369513

Cited by 13 publications

(6 citation statements)

References 18 publications

(19 reference statements)

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“…The fitting parameters were varied 185 until the model showed a reasonable fit to the experimental results for = 1.4 µC m -2 and = 11000 µm 2 . We note that surface charge densities characterized by = 1.4 µC m -2 are reasonable, as they are similar to results found experimentally in glass particle systems (Waitukaitis et al, 2014), and they are significantly smaller than surface charge densities measured for triboelectrically charged quartz (Miura and Arakawa, 2007;Shen et al, 2016). Results…”

Section: Laboratory Studiessupporting

confidence: 87%

“…Particle diameters were based on a lognormal size distribution characteristic of atmospheric dust with = 1.5 µm and = 0.75 µm (Reid, 2003). Particle surface charge densities were based on a normal distribution with = 0 and = 110 µC m -2 such that half the particles are of each polarity and highly charged particles (two standard deviations from the mean) have surface charge 235 densities characteristic of triboelectrically charged quartz (Miura and Arakawa, 2007). Simulations were carried out for 10 5 particles.…”

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confidence: 99%

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Electrostatic forces alter particle size distributions in atmospheric dust

Toth¹,

Rajupet²,

Squire³

et al. 2019

Preprint

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<p><strong>Abstract.</strong> Large amounts of dust are lofted into the atmosphere from arid regions of the world before being transported up to thousands of kilometers. This atmospheric dust interacts with solar radiation causing changes in the climate, with larger-sized particles having a heating effect, and smaller-sized particles having a cooling effect. Previous studies on the long-range transport of dust have found larger particles than expected, without a model to explain their transport. Here, we investigate the effect of electric fields on lofted airborne dust by blowing sand through a vertically-oriented electric field, and characterizing the size distribution as a function of height. We also model this system, considering the gravitational, drag, and electrostatic forces on particles, to understand the effects of the electric field. Our results indicate that electric fields keep particles suspended at higher elevations and enrich the concentration of larger particles at higher elevations. We extend our model from the small-scale system to long-range atmospheric dust transport to develop insights on the effects of electric fields on size distributions of lofted dust in the atmosphere. We show that the presence of electric fields and the resulting electrostatic force on particles can help explain the transport of unexpectedly larger particles and cause the size distribution to become more uniform as a function of elevation. Thus, our experimental and modelling results indicate that electrostatic forces should be considered when determining the effect of atmospheric dust on the climate.</p>

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Section: Laboratory Studiessupporting

confidence: 87%

mentioning

confidence: 99%

Electrostatic forces alter particle size distributions in atmospheric dust

Toth¹,

Rajupet²,

Squire³

et al. 2019

Preprint

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“…For electrostatic forces to account for these deviations in size distributions of atmospheric dust particles, σ E must be on the order of ∼ 10 mC V m −3 . To the authors' knowledge, field studies of atmospheric dust have not measured surface charge densities of dust particles to confirm whether particles have sufficient charge for electrostatic effects to be significant; we note that volumetric charge densities have been measured (Nicoll et al, 2011) but cannot be translated to surface charge densities, which may be much larger than volumetric charge, which is the net charge of a distribution of negatively and positively charged particles. However, we emphasize that surface charge densities on the order of ∼ 10 to ∼ 100 µ C m −2 , which could cause significant electrostatic effects on transport, are routinely observed in laboratory set-tings (Cottrell, 1978;Donald, 1968;Horn and Smith, 1992;Matsuyama et al, 2003;Miura and Arakawa, 2007;Nordhage and Bäckström, 1977;Shen et al, 2016).…”

Section: Modeling Field Studiesmentioning

confidence: 76%

“…However, we emphasize that surface charge densities on the order of ∼ 10 to ∼ 100 µ C m −2 , which could cause significant electrostatic effects on transport, are routinely observed in laboratory set-tings (Cottrell, 1978;Donald, 1968;Horn and Smith, 1992;Matsuyama et al, 2003;Miura and Arakawa, 2007;Nordhage and Bäckström, 1977;Shen et al, 2016). While charges on particles may decay through gas neutralization, experiments have found surfaces retaining charge even after days of exposure to ambient conditions (Olthuis and Bergveld, 1992;Yuan and Li, 2005;Leonov et al, 2006) and charged dust has been observed in the atmosphere even after being transported for long times (Nicoll et al, 2011;Harrison et al, 2018;Renard et al, 2018). Moreover, subsequent particle collisions during transport could further charge particles through the triboelectric effect.…”

Section: Modeling Field Studiesmentioning

confidence: 83%

Electrostatic forces alter particle size distributions in atmospheric dust

et al. 2020

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Abstract. Large amounts of dust are lofted into the atmosphere from arid regions of the world before being transported up to thousands of kilometers. This atmospheric dust interacts with solar radiation and causes changes in the climate, with larger-sized particles having a heating effect, and smaller-sized particles having a cooling effect. Previous studies on the long-range transport of dust have found larger particles than expected, without a model to explain their transport. Here, we investigate the effect of electric fields on lofted airborne dust by blowing sand through a vertically oriented electric field, and characterizing the size distribution as a function of height. We also model this system, considering the gravitational, drag, and electrostatic forces on particles, to understand the effects of the electric field. Our results indicate that electric fields keep particles suspended at higher elevations and enrich the concentration of larger particles at higher elevations. We extend our model from the small-scale system to long-range atmospheric dust transport to develop insights into the effects of electric fields on size distributions of lofted dust in the atmosphere. We show that the presence of electric fields and the resulting electrostatic force on charged particles can help explain the transport of unexpectedly large particles and cause the size distribution to become more uniform as a function of elevation. Thus, our experimental and modeling results indicate that electrostatic forces may in some cases be relevant regarding the effect of atmospheric dust on the climate.

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“…Furthermore, our conclusions regarding the relative impor tance of electrostatic forces depend strongly on the surface charge density a. We note that the charge density on sur faces has been reported with values of ~10-6 [51,52], ~10-5 [53,54], ~10-4 [7,[55][56][57], and ~10-3 C m-2 [58]. As discussed earlier, FE /FV for a given system can be well approximated using analytic expressions by estimating that FE « FE.…”

Section: Discussionmentioning

confidence: 53%

Relative importance of electrostatic and van der Waals forces in particle adhesion to rough conducting surfaces

et al. 2021

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Gas discharge caused by triboelectricity around a contact during friction between insulators

Cited by 13 publications

References 18 publications

Electrostatic forces alter particle size distributions in atmospheric dust

Electrostatic forces alter particle size distributions in atmospheric dust

Electrostatic forces alter particle size distributions in atmospheric dust

Relative importance of electrostatic and van der Waals forces in particle adhesion to rough conducting surfaces

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