(37b) Electrostatic Charge Transfer Due to Single Impact of Pharmaceutical Powders
AIChE Spring Meeting and Global Congress on Process Safety
2006
2006 Spring Meeting & 2nd Global Congress on Process Safety
Fifth World Congress on Particle Technology
Brian Scarlett Memorial Session - II
Monday, April 24, 2006 - 1:20pm to 1:40pm
In processing of particulate solids, particle-wall and particle-particle collisions can generate electrostatic charges. This can lead to a variety of problems ranging from fire and explosion hazards to segregation, caking and blocking. For a fundamental understanding of the particle charging, it is essential to study the charge transfer due to single particle impacts on a target. We have designed and constructed a new experimental rig that can measure charge transfer due to a single impact between a particle and a target plane. In this study, pharmaceutical particles were tested by impacting against a stainless steel target. The amount of charge transfer due to impact can be described as a function of impact velocity and impact angle as well as initial charge. It is noted that for a given material, initial particle charge for which no charge transfer occurs due to impact is independent of impact velocity. This is viewed as a characteristic property which is related to the contact potential difference and tribo-electric series of the sample powders.
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