Optical Diagnostics for Dual Jet Interactions of Helium Atmospheric Pressure Plasmas

In this study, the interactions of dual plasma jets have been optically diagnosed for various alignment angles, gas flow rates, and applied voltage conditions to investigate the interactions of plasma plumes emitted from each jet. An anti-parallel alignment of the dual jets with in-phase voltage waveforms had a repulsive interaction. In contrast, the perpendicular alignment results in an attractive interaction when the applied voltage and gas flow rate are sufficiently large. We found that the mechanisms of the attractive and repulsive interactions are strongly related to the electrostatic potential distributions between the dual jets.