Characterization of Electrostatic Fields in the Corona-Wire Charger of the PM2.5 Sampler
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The corona-wire aerosol chargers are widely used to charge particulate matter in the PM2.5 sampler. It is well known that charging efficiency depending on the ion number concentration, corresponding to the electrostatic field characteristics in the charger. Therefore, electrostatic field characteristics in the charger are important factors influencing particle charging efficiency. In this study, the electrostatic fields in the corona-wire aerosol charger were experimentally characterized. The numerical model for the electrostatic field was developed and calculated with a commercial computational fluid dynamic software package, CFDRCTM. Current-voltage characteristics of the charger and calculations of the electric field flow lines on which the ions travel from ion generation zone to charging zone of the charger were showed and discussed. It was shown that the numerical results show better agreement with the experimental results.
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