Dynamics of electrostatically-driven granular media. Effects of Humidity

Details Dynamics of electrostatically-driven granular media. Effects of Humidity Dynamics of electrostatically-driven granular media. Effects of Humidity

2000-11-03

arxiv.org/abs/cond-mat/0011068v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figs

Scientific paper

10.1103/PhysRevE.63.050301

We performed experimental studies of the effect of humidity on the dynamics of electrostatically-driven granular materials. Both conducting and dielectric particles undergo a phase transition from an immobile state (granular solid) to a fluidized state (granular gas) with increasing applied field. Spontaneous precipitation of solid clusters from the gas phase occurs as the external driving is decreased. The clustering dynamics in conducting particles is primarily controlled by screening of the electric field but is aided by cohesion due to humidity. It is shown that humidity effects dominate the clustering process with dielectric particles.

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