Multi-point discharge model: study on corona discharge of double-ended needle in large space

Abstract

Corona discharge, as a common means to obtain non-equilibrium plasma, can generally obtain high concentration plasma by increasing discharge points to meet production needs. However, the existing numerical simulation models used to study multi-point corona discharge are all calculations of small-scale space models, which cannot obtain the distribution characteristics of plasma in large space. Based on our previous research, this paper proposes a hybrid model for studying the distribution of multi-point discharge plasma in large-scale spaces, which divides the computational domain and computes separately with the hydrodynamic model and the ion mobility model. The simulation results are verified by the needle-ball electrode device. Firstly, the electric field distribution and plasma distribution of the needle electrodes with single tip and double tips are compared and discussed. Secondly, the plasma distribution of the needle electrode with the double tip at different voltages was investigated. Both computational and experimental results indicate that the charged particle concentration and current of the needle electrode with double tips are both twice as high as those of the needle electrode with a single tip. This model can extend the computational area of the multi-point corona discharge finite element model to the sub-meter (25 cm) or meter level, which provides an effective means to study the plasma distribution generated by multiple discharge points in the large-scale space.

Self-organized patterns at the plasma–liquid anode interface in a helium glow discharge: temporal development and mechanisms

“…Pattern formation has also been observed to occur for glow discharges interfacing with a metal anode as reported in handful of publications [15][16][17][18]. Several of these observations were for different plasma operation conditions as typically used for glow discharges with liquid electrodes.…”

“…Several of these observations were for different plasma operation conditions as typically used for glow discharges with liquid electrodes. This includes reduced pressure [16,18] and very high currents of the order of amperes [17]. Only Shirai et al [15] reported pattern formation on a metal anode with similar operation conditions as used for glow discharges with liquid electrodes.…”

Spatiotemporal corona discharge characteristics of nanoelectrode: array carbon nanotubes

“…Although a few studies have simulated the corona discharge of nanoelectrodes in the micro-discharge gap in ionization sensors [2,[25][26][27], they cannot be applied to scenes requiring large discharge gaps (centimeter-level) such as gas purification and electronic equipment cooling. In our previous study, we proposed a method to solve the corona discharge model with a large discharge gap based on the hydrodynamic model and ion migration model [28][29][30][31]. This method effectively solves the problem of difficult convergence of corona discharge models with large computational domains (much larger than the electrode size).…”