2013 Volume 50 Issue 12 Pages 845-850
This paper reports a new development of an apparatus to evaluate the accumulation process of electrostatic charge of bulk powder (or multiple particles). In a metal cubic container installed on an oscillator, a certain number (1-100) of spherical polymer particles of a single size, in the range of 2-4 mm in diameter, were loaded after neutralization, and they were shaken. After the shake, all the particles were poured into a Faraday-cage, and the total charge was measured. The maximum charge per particle decreased with an increase of particle number loaded. The experimental results were well explained with a modified new model of particle charging originally proposed by the authors, in which the space charge effect was involved as a function of particle size and volume fraction of particles in the capsule and capsule size.
