Modeling of charge neutralization by ionizer

This paper discusses the effect of the relationship between the discharge frequency and background airflow velocity of ac corona ionizers on charge neutralization investigated by a computer model. The one-dimensional fluid model consists of a model for ion sources, the continuity equations for ions, Poissonʹs equation for the electric field, and the circuit equation for solving the potential of the object to be neutralized. The model shows that the neutralization strongly depends on the relationship and demonstrates that at relatively high airflow velocities, the charges of objects cannot be neutralized. It is determined that the essentials for sufficient neutralization are that in the region of ion transport, the density distributions of positive and negative ions have no fluctuation and their total space charges become almost zero at a steady state.