Analytical Investigation of an Electrostatic Precipitator for Excess Ions Removal after Charging Process of the Electrical Mobility Spectrometer
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An electrostatic precipitator (ESP) is widely used to work as an ion precipitator for removing the excess ions mixing with the charged particles after charging process of the electrical mobility spectrometer. In this paper, the ion precipitator for the electrical mobility spectrometer was designed, constructed, and analytical investigated. An analytical model was developed to investigate the ions transport inside the ion precipitator to give a better understanding on the operation of the ion precipitator in this study. The analysis was carried out for positive ions, positively applied voltage at the wire electrode between 10 and 100 V, total flow rate of 1 and 5 L/min, operating pressure of 1000 mbar and radial distance of the inlet between 0.15 and 14 mm at a fixed radial of wire and outer electrodes. It was found that higher applied wire electrode voltage caused ions to deposit closer to the entrance. Conversely, faster flow rate forced ions to impact the wall further downstream. It was shown that all charged particles of 10 nm in diameter can pass through the ion precipitator smoothly without precipitated at the outer electrode. It can be concluded that the prediction of ion and particle trajectories was particularly useful in the ion precipitator design.
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