Triboelectrification and Razorbacks: Geophysical Patterns Produced in Dry Grains

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

doi:10.1103/physrevlett.96.178002

Cited by 46 publications

(26 citation statements)

References 14 publications

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“…Such fields are well documented to exist 22,23,24 , yet their cause in natural sandstorms is poorly understood. In some cases, the source may be external, as in reports that nearby thunderstorms 5 or charged bodies 29 can provoke granular charging. In other cases, it remains to be determined how a sandstorm might both generate strong charges and produce the electric field that engenders the charging to begin with.…”

Section: Resultsmentioning

confidence: 99%

Why do particle clouds generate electric charges?

Pähtz¹,

2010

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Grains in desert sandstorms spontaneously generate strong electrical charges; likewise volcanic dust plumes produce spectacular lightning displays. Charged particle clouds also cause devastating explosions in food, drug, and coal processing industries. Despite the wide-ranging importance of granular charging in both nature and industry, even the simplest aspects of its causes remain elusive, for it is difficult to understand how inert grains in contact with little more than other inert grains can generate the large charges observed. In this paper, we present a simple yet predictive explanation for the charging of granular materials in collisional flows. We argue from very basic considerations that charge transfer can be expected in collisions of identical dielectric grains, and we confirm the model's predictions using discrete element simulations and a tabletop granular experiment.

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Section: Resultsmentioning

confidence: 99%

Why do particle clouds generate electric charges?

Pähtz¹,

2010

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“…This produces repulsion between the particles that was not present prior to the collision. This repulsion is a real physical effect that is seen in experiments32, and so we include the repulsion in our simulations.…”

Section: Methodsmentioning

confidence: 99%

Self-charging of identical grains in the absence of an external field

Yoshimatsu

Araújo

Wurm

et al. 2017

Sci Rep

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We investigate the electrostatic charging of an agitated bed of identical grains using simulations, mathematical modeling, and experiments. We simulate charging with a discrete-element model including electrical multipoles and find that infinitesimally small initial charges can grow exponentially rapidly. We propose a mathematical Turing model that defines conditions for exponential charging to occur and provides insights into the mechanisms involved. Finally, we confirm the predicted exponential growth in experiments using vibrated grains under microgravity, and we describe novel predicted spatiotemporal states that merit further study.

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“…The charging of grains has been studied in several commonly used particle handling systems, including pneumatic conveyers [12], mixers [13,14], chutes [15], and fluidized beds [16][17][18][19]. In view of the breadth of electrostatics applications, a considerable body of literature has been developed to study a variety of charging systems.…”

Section: Introductionmentioning

confidence: 99%