Effects of pre-charger length, symmetry and insertion depth on PM2.5 removal efficiency for electrostatic precipitator (ESP)-type wearable personal air cleaner

Abstract

Electrical properties such as the electric field, charge transport, the coupling between them; and particles' trajectories and particles’ charging in the turbulent air flow field, are simulated for four pre-chargers of a two-stage electrostatic precipitator (ESP) fitted inside a prototype wearable personal air cleaner. Three of the pre-chargers are cylindrical with various lengths; the fourth pre-charger is the combination of a cylinder and a cuboid. The purposes of these simulations are to investigate the variations in the pre-chargers' electrical properties when the pre-chargers differ in length and symmetry, and to support the PM_2.5 removal efficiency values which are experimentally measured on all insertion depths of the optimal pre-charger and for all pre-chargers.