Current-Voltage Characteristics of Unipolar Corona-Needle Charger for Nanoparticles
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Particle charger is an important upstream component in the aerosol particle size measurement system by electrical mobility classification in order to impose a known net charge distribution on the aerosol particles. Corona discharge is one of the most commonly technique to produce ion for particle charging. In this study, the coronaneedle aerosol charger for unipolar diffusion charging of nanoparticles was designed, constructed, and evaluated. The results of the experimental investigations of the corona discharge of the charger based on current measurements were presented and discussed. It was found that the charging current and ion concentration in the charging zone increase monotonically with corona voltage. The Nit product in the charging zone was found to decrease with aerosol flow rate. The ion number concentrations at the outlet were found to increase with aerosol flow rate at the same corona voltage. It was also shown that the portion of transported ion number concentration from the charger to the Faraday cup is about 7 %.
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