Modeling and simulation of transport processes in capacitively coupled radio frequency driven at- mospheric pressure plasma jets

Capacitively coupled radio frequency driven atmospheric pressure plasma jets (CCRF APPJ) are used in biomedical science and surface modification. Numerical methods allow investigating a APPJ's gas and plasma dynamics. A hybrid simulation code is implemented to investigate a CCRF APPJ. This hybrid code handles electrons kinetically in a particle-in-cell/Monte Carlo collisions (PIC/MCC) scheme. Moreover, hydrodynamic particle balance equations are solved for ions and other heavy particles. The simulation cycle of charged and neutral particles is separated, accounting for their different time scales. Additionally, the separation spares computational resources. A one-dimensional (i.e., between the electrodes) continuity equation is solved for the charged heavy particles invoking a drift-diffusion approximation. For neutral heavy particles, the gas flow velocity is calculated by Hagen Poisseuille's law, and a two-dimensional (i.e., along the gas flow and in between the electrodes) advection-diffusion-equation is solved for the particle densities. The chemical base composition of the simulated gas discharge consists of helium and oxygen. The main goal of this work is to implement a simple and robust scheme that two-dimensionally resolves complex chemistry and gas dynamics without evoking a PIC scheme in two dimensions. However, the kinetic treatment of electrons is crucial for accurately describing the electron dynamics in atmospheric pressure discharges.