Corona Ionizer for Unipolar Diffusion Charging of Nanometer Aerosol Particles
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A corona ionizer for unipolar diffusion charging of nanometer-sized aerosol particles has been constructed and evaluated. The electrical discharge characteristics of a corona ionizer based on current measurements for positive and negative coronas were investigated and discussed. A semi-empirical method was used to determine the ion concentrations in the charging zone and at the outlet of the ionizer. The charging current and ion concentration in the charging zone were found to increase with corona voltage. The ion number concentration at the outlet for positive corona of the ionizer was higher than for negative corona at the same voltage. Electric fields in the charging zone of the ionizer were also analyzed via numerical computation. Strong electric field strength zone was identified and led to high charging.
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