A numerical study on particle collection for wavy dielectric plate in 2-stage wire-plate electrostatic precipitator

This study numerically investigated the ultrafine particle collection characteristics in the two-stage electrostatic precipitator with the dielectric plate according to the shape of the dielectric separator and air inlet velocity. This study developed a multi-physics model which analyzes the electrostatic characteristics and particle motion of the electrostatic precipitator and was implemented by using UDF (user defined function) in Ansys Fluent. The effect of the electro-hydrodynamic flow induced by the corona discharge formed in the vicinity of the high voltage wire on the air flow in the charged region of the electrostatic precipitator was investigated. The trajectories of charged ultrafine particles and their collection efficiency depended on the shape of the dielectric separator and air inlet velocity. The collection efficiency for the wavy dielectric separator is higher when the air inlet velocity is low and lower when the air inlet velocity is high, compared to that for the flat dielectric precipitator.