Modeling simulation of nitric oxide and ozone generated by the Compact Air Plasma Jet: Nightingale^®

Abstract

This study aimed to model and investigate the distribution characteristics of NO and O3 produced by a Compact Air Plasma Jet device using 0D and 2D fluid models. The 0D global model was employed to calculate densities in the plasma volume before constructing the 2D model for the distribution of densities via boundary conditions. As the feeding gas flow rate increased from 3 to 11 slm, the NO and O3 densities predicted by the 0D model decreased from 10 ppm to 1 ppm and from approximately 12 ppm to 1 ppm. In comparison with the gas detector measurements, the NO densities exhibited the same values and trends with respect to the number of pulses and flow rate, but O3 concentrations from the 0D model simulations were higher than those measured by the gas detector. With a 20 ms simulation time, NO concentrations decreased along the axial length, whereas O3 concentrations increased. Additionally, O3 concentrations from both models were higher than the measurements from the gas detector, which did not align with the experimental results. The incorporation of dominant humidity reaction sets improved the alignment between the modeling results and specific experimental observations. The model equipped with these additional humidity reaction sets can be effectively employed to predict the NO and O3 density generated by the Compact Air Plasma Jet device.