The effect of the generation and handling in the acquired electrostatic charge in airborne particles

Marra, W.D.; Rodrigues, Marcos Vinícius; Miranda, Rosilene G.A.; Barrozo, M. A. S.; Coury, José Renato

doi:10.1016/j.powtec.2008.10.018

Cited by 10 publications

(3 citation statements)

References 14 publications

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“…It was found that as the particle diameter increased, the averaged induced currents increased dramatically. This result agreed with the experimental findings by Marra et al, who studied the tribocharging of aerosols of fine phosphate rock concentrations and observed that the generated charge of particles increased accordingly with the mean particle size, implying a greater extent of electrostatics. In addition, this trend was also supported by experimental work on horizontal pneumatic flow done by Saleh et al, who found that particle charge-to-mass ratio increased with mean particle size, indicating greater electrostatic phenomenon.…”

Section: Resultssupporting

confidence: 92%

Experimental and Numerical Investigations on the Electrostatics Generation and Transport in the Downer Reactor of a Triple-Bed Combined Circulating Fluidized Bed

Cheng

Lau

Guan

et al. 2012

Ind. Eng. Chem. Res.

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Electrostatics is an inevitable phenomenon in fluidization processes and granular flow systems where collisions between particulates and walls with different materials occur. In this study, the electrostatic performance in the downer reactor of a triple-bed combined circulating fluidized bed was investigated through both experiments and numerical simulations. In numerical simulation the Discrete Element Method (DEM) was adopted to simulate the electrostatic charge generation and transfer occurring in the downer. Both experimental and numerical results showed that the averaged induced currents caused by electrostatics increased with increasing solids mass flux in the downer, and the electrostatics was the strongest near the entrance of the downer because of the highest frequency of collisions between particles and the wall caused by the largest solids holdup at that location. Numerical studies also revealed that the averaged induced currents increased with increasing initial particle velocity and particle size, and the averaged induced current caused by the charge transfer was much larger than those by charge generation through tribocharging. These results may help us better understand the mechanism of electrostatic phenomena, and better cope with challenges and problems caused by electrostatics.

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Section: Resultssupporting

confidence: 92%

Experimental and Numerical Investigations on the Electrostatics Generation and Transport in the Downer Reactor of a Triple-Bed Combined Circulating Fluidized Bed

Cheng

Lau

Guan

et al. 2012

Ind. Eng. Chem. Res.

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“…This result agrees well with the experimental findings by Cheng et al [25], who investigated electrostatics generation in a downer reactor and observed that the averaged induced currents increase with granule diameter. In addition, this conclusion also agrees well with the experiment work done by Marra et al [26], where they studied tribocharging of aerosols of fine phosphate rock concentrations and concluded that electrostatics charge generated increases with granule size. In 1976, Masuda et al [27] found that during granule-wall elastic collisions the contact area was different with granule size.…”

Section: Sliding Area Effectsupporting

confidence: 92%

Electrostatic charging of single granules by repeated sliding along inclined metal plates

Zhao¹,

Zhou²,

Ye³

et al. 2017

Journal of Electrostatics

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In this work, repeated sliding tests for single granules were investigated for their electrostatics generation. Several factors were considered including granule length-ratio, sliding face shape, sliding times, sliding area, sliding velocity, front-facing edge, plate inclined angle and humidity. Generally, it is found that electrostatics increases with granule length-ratio. Two kinds of granular sliding face shapes were used in this work, half circle and rectangle. Under the same working conditions, a granule with the sliding face shape of half-circle tends to produce more electrostatics than that of rectangle. In addition, the efficiency of granule charge generation increases with sliding times although the amount of impact charge is decreased by the initial charge. Electrostatics increases with sliding area, which is independent of granule sliding-face shape and sliding times. Electrostatics also increases with granule sliding velocity. Front-facing sliding with a short edge tends to generate more electrostatics than that with a long edge. In this work, three sliding-plate angles were chosen as 30°,54°,70°, where granules sliding along the inclined plate at 54° acquired the highest electrostatics in comparison with other two angles. Humidity has significant effect on electrostatics as that electrostatics decreases with humidity. At lower relative humidity, the granule length-ratio is found to have more effect on electrostatics.

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“…This result agreed with the experimental findings by Cheng et al [9], who the electrostatics generation in the downer reactor and observed that the averages induced currents increased with particle diameter. In addition, this trend was also supported by experimental work on tribocharging of aerosols of fine phosphate rock concentrations done by Marra et al [22], who found that the generated charge of particles increased accordingly with the mean particle size, implying a greater extent of electrostatics. Masuda et al [23] used Hert's theory to show that contact area during elastic collisions varied positively with particle size.…”

Section: Influence Of Length-ratiosupporting

confidence: 60%

Experimental Investigation of Electrostatic Charge Generation for Granules

Zhou

Yin

et al. 2015

Procedia Engineering

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In studies of granule electrification due to sliding, quantitatively evaluating the charging characteristic of single particles, rather than of a mass of granules as a group, is important for a fundamental understanding of the elementary tribocharging phenomenon, which is complicated, since it is resulted from electrical and physical properties of granules and operational environment conditions. In this work, charge transfer due to a single particle repeated sliding along metal plane for Polyvinyl Chloride(PVC)granules(diameter 1.1-4.1 mm, in the shape of halfcircle or rectangle). The amount of transferred charge is expressed as a function of granular shape factor, such as length-ratio, sliding area, front-facing edge, as well as sliding velocity, plane angle and relative humidity. The transferred charge increases with length-ratio and area. Front-facing edge, plane angle, sliding velocity and relative humidity do have effect on the degree of electrification.

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The effect of the generation and handling in the acquired electrostatic charge in airborne particles

Cited by 10 publications

References 14 publications

Experimental and Numerical Investigations on the Electrostatics Generation and Transport in the Downer Reactor of a Triple-Bed Combined Circulating Fluidized Bed

Experimental and Numerical Investigations on the Electrostatics Generation and Transport in the Downer Reactor of a Triple-Bed Combined Circulating Fluidized Bed

Electrostatic charging of single granules by repeated sliding along inclined metal plates

Experimental Investigation of Electrostatic Charge Generation for Granules

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