Charging of Macroparticles in a Corona Discharge in an Air Flow

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The charging of Al₂O₃ macroparticles with dimensions ranging from 20 to 40 μm in a gas flow passing through a multielectrode corona discharge is investigated. The corona discharge is produced by a system of wire electrodes arranged across the gas flow. The particle charge and mass are measured using a linear electrodynamic trap. For a corona voltage of 18 kV, the average charge-to-mass ratio is found to be 1.69 × 10¹³e/g for particles charged in the positive corona and 1.35 × 10¹³e/g for particles charged in the negative corona.