Charging and coagulation of radioactive and nonradioactive particles in the atmosphere

摘要: Abstract. Charging and coagulation influence one another impact the particle charge size distributions in atmosphere. However, few investigations to date have focused on kinetics of atmospheric particles accumulating charge. This study presents three approaches include mutual effects charging microphysical evolution such as radioactive particles. The first approach employs ion balance, a bivariate population balance model (PBM) comprehensively calculate both accumulation rates second involves much simpler description charging, uses monovariate PBM subsequent coagulation. third is further simplified assuming that instantaneously reach their steady-state distributions. It found compared other two approaches, can accurately predict time-dependent changes over wide range covering from free molecule continuum regimes. reliably for larger than about 0.04 micrometers atmospherically relevant conditions. These are applied investigate neutralizer, urban atmosphere, an system containing Limitations discussed.