The static electrification of particles in gas‐solids pipe flow

Masuda, Hiroaki; Komatsu, Takahiro; Iinoya, Koichi

doi:10.1002/aic.690220320

Cited by 105 publications

(44 citation statements)

References 4 publications

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“…Many authors treat their results within the hypothesis of contact charging (Matsuyama & Yamamoto 1989;John et al 1980;Kacprzyk & Gajewski 2001;Masuda et al 1976;Cheng & Soo 1970), although the explanation of results is not fully satisfying. The application of former tribocharging experiments with small particles is restricted by the experimental parameters because mostly the velocities were smaller, the particles larger than desirable, the materials were hardly relevant for our applications, and the role of surrounding gas is an open issue as is suggested by a particle measurement technique which involves ions adhering to charged particles.…”

Section: Charge Transfer In Particle Collisionsmentioning

confidence: 99%

Further experiments on collisional tribocharging of cosmic grains

Poppe

Schräpler

2005

A&A

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Abstract. We experimentally investigated tribocharging in bouncing dust grain collisions under conditions which are relevant for the early solar nebula. We used silica, diamond, graphite, and silicon carbide grains and cm-sized targets of aluminum, iron, and graphite. We varied particle size around 1 µm, collision velocity between 38 to 106 m s −1 , and target temperature between 240 K and 360 K. Generally, the grains acquire something in the order of hundreds or thousands of negative elementary charges, which is at the upper end of the range previously discussed in astrophysical research. Mainly, a temperature difference caused by the dissipation of collisional energy or by initial temperatures determines the amount of charge transfer. It suggests a thermally diffusive charge transfer process of negative charge carriers. Nevertheless, also other processes of secondary importance were effective. Material-dependent contact charging is ruled out as the dominant charge transfer process in our experiments. For most particle-target combinations, the charge transfer can be described by an empirical function of collision energy which we propose for future astrophysical applications, especially for applications on the sticking efficiency in the preplanetary dust aggregation process, on the particle motion in the solar nebula, and on the possibility of nebular lightning.

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Section: Charge Transfer In Particle Collisionsmentioning

confidence: 99%

Further experiments on collisional tribocharging of cosmic grains

Poppe

Schräpler

2005

A&A

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“…The force acts only in the neighbourhood of the sampling probe, because the force is inversely proportional to s5 as seen in Eq. (8).…”

Section: Resultsmentioning

confidence: 99%

Theoretical study of electrostatic effects on isokinetic dust-sampling.

Masuda

Yoshida

Iinoya

1980

J. Chem. Eng. Japan

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Isokinetic dust-sampling does not guarantee a true concentration measurement of particles when the particles and the sampling probe are electrified. The measured concentration is lower than the true concentration when both the particles and the probe are electrified to the same polarity. If the polarities of their electrostatic charges are opposite, the measured concentration is higher than the true concentration. The effect becomes predominant as the particle inertia becomes smaller. The sampling error takes a maximumin a certain range of particle diameter depending on the sampling conditions. Further, the smaller the probe, the larger the electrostatic effects. The effect of the induced force is, however, very weak and is negligible in actual cases. The results obtained in this paper give a better understanding of experimental results left unexplained.

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“…Masuda et al 20 coated a section of a pipeline with a polymer film and used a galvanometer to measure the current transfer upon impact. The number of particle contacts with the wall was then related to the charge transfer.…”

Section: Introductionmentioning

confidence: 99%

Prediction of particle charging in a dilute pneumatic conveying system

et al. 2013

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When particles are transported in pipelines, they acquire electrostatic charges as they come into contact with the pipe wall. Charged particles can cause problems such as particle agglomeration, blockage, and explosion. Understanding the particle charge can help to prevent these issues. This study investigates a technique for predicting the particle charge in a straight pipe of any given length, as well as the pipe length at which electrostatic equilibrium occurs, through experimentation in a short 1m pipe section.Experimentation with five different types of particles and four pipe wall materials at longer pipe lengths were used to validate the technique. This predictive technique is applicable to a range of particle shapes and sizes under the restriction that charge transfer is due to impact charging. Heading:Particle technology and fluidization

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The static electrification of particles in gas‐solids pipe flow

Abstract: Electrostatic characteristics in gas-solids flow in a metal pipe are studied both theoretically and experimentally with particular attention to the collision between particles and pipe wall. Effects of gas velocity and particle diameter on the electrification are also examined.

Cited by 105 publications

References 4 publications

Further experiments on collisional tribocharging of cosmic grains

Further experiments on collisional tribocharging of cosmic grains

Theoretical study of electrostatic effects on isokinetic dust-sampling.

Prediction of particle charging in a dilute pneumatic conveying system

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