“…Ghosh et al obtained similar prediction results for ultrafine particles to those obtained according to the Fuchs theory; thus the Fuchs theory was preferred in the present study. According to Kapcov [58], the charging of particles in the field of a corona discharge is assumed to be predominantly unipolar; therefore, the coagulation factor β for unipolar charged monodisperse particles was determined using the Green and Lane method [54] with respect to electrostatic dispersion, as follows:…”