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Title: New instrument for tribocharge measurement due to single particle impacts

During particulate solid processing, particle-particle and particle-wall collisions can generate electrostatic charges. This may lead to a variety of problems ranging from fire and explosion hazards to segregation, caking, and blocking. A fundamental understanding of the particle charging in such situations is therefore essential. For this purpose we have developed a new device that can measure charge transfer due to impact between a single particle and a metal plate. The device consists of an impact test system and two sets of Faraday cage and preamplifier for charge measurement. With current amplifiers, high-resolution measurements of particle charges of approximately 1 and 10 fC have been achieved before and after the impact, respectively. The device allows charge measurements of single particles with a size as small as {approx}100 {mu}m impacting on the target at different incident angles with a velocity up to about 80 m/s. Further analyses of the charge transfer as a function of particle initial charge define an equilibrium charge, i.e., an initial charge level prior to impact for which no net charge transfer would occur as a result of impact.
Authors:
; ; ; ;  [1] ;  [2] ;  [3] ;  [3]
  1. Institute of Particle Science and Engineering, University of Leeds, Woodhouse Lane, Leeds, West Yorkshire LS2 9JT (United Kingdom)
  2. (Japan)
  3. (United Kingdom)
Publication Date:
OSTI Identifier:
20953265
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 78; Journal Issue: 2; Other Information: DOI: 10.1063/1.2671585; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; AMPLIFIERS; CHARGED PARTICLES; EXPLOSIONS; FARADAY CUPS; FIRES; HAZARDS; IMPACT TESTS; PLATES; PRESSING; VELOCITY