Abstract
The paper brings the results of laboratory measurements of the electrification of polystyrene particles during pneumatic transport. The electrification was measured as a function of the particle size, relative humidity of air, transport speed and solid load. It has been found that the degree of the material electrification (in C/kg) is the greater, the smaller the particles. For a definite fraction (size) of the particles the electrification degree of the material increases when the relative humidity of the air and the solid load decrease, while the transport speed increases. The experimental data have been compared with the values of the theoretically maximum charge. It has been found that the values of the charge per unit mass obtained experimentally are considerably smaller than the theoretically maximal values.
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