Granules are widely used in chemical

energy

food

pharmaceutical

mining and relevant industries. In solid processing systems

electrostatics could be commonly generated

which causes many problems

such as granule clustering

blocking

sparking and even exploding.So far

the functional dependence of electrostatic charge generation on granular size and shape has not been fully understood.In this work

granules made of polyvinyl chloride(PVC)with shapes of triangle or trapezium and mean size 2.0—5.0 mm

were studied.Granular shape factors

such as front-facing angle

length-ratio

area

and sliding orientation

relative humidity affected electrostatics greatly

but independent of how many times of granule sliding.