Microdischarge Dynamics of Dielectric Barrier Discharge Under External and Convective Gas Flow

The study of microdischarge dynamics (MD) in dielectric barrier discharge (DBD) is gaining much attention due to high interest in the collective interaction of MD filaments, memory effects, and the formation of self-organized patterns. In this work, the MD dynamics of atmospheric pressure air DBD were studied under the impact of forced external gas flow and natural convective flow. For this, rail type and parallel-plate discharge electrode arrangements were used. The discharge between rail electrodes in external airflow along the electrodes clarified the role of volume plasma and surface charges in the memory effect of microdischarges [1] . The change in the gas flow regime from laminar to turbulent shows the complex dynamics of MD filaments with trajectories downstream and upstream to the gas flow direction. The impact of convective flow due to the temperature gradient between discharge cell electrodes and ambient air was studied for parallel-plate electrode arrangement. The convective gas flow velocity increased at a higher thermal gradient, and the MD channels follow the gas flow direction. The velocity of convective flow was estimated by the CFD simulation and compared with the mean velocity of MD channels obtained by the particle image velocimetry method.