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填充床介质阻挡放电通常采用某一种材料进行填充以实现等离子体催化反应, 而利用不同材料混合填充可以实现更复杂的化学反应. 为了深入理解混合填充放电的物理机制, 本文基于粒子云网格/蒙特卡洛碰撞（PIC/MCC）模型对其动力学行为进行了研究. 结果表明, 流光最先在高介电常数 (εr) 的介质柱底部产生, 并沿着低εr介质柱缝隙向下传播. 当流光传播到下介质板后, 该放电转化为体放电. 随后, 在上介质板附近又产生一个新的流光, 并沿着高εr介质柱缝隙向下传播. 研究发现, 电子和正离子的数量随时间先增加, 在0.8 ns后电子数随时间减少, 但正离子数几乎保持不变. 在此过程中负离子数随时间单调增加. 此外, 介质柱缝隙中平均电子密度 (ne) 和平均电子温度 (Te) 随气压升高均减小. 它们随着电压幅值或介质柱半径的增大而增大. 随工作气体中氮气含量的增加, ne先减小后增大, 而Te单调增大. 这些研究结果对优化反应器设计, 进一步提升填充床介质阻挡放电的反应效率具有重要意义.Packed bed dielectric barrier discharge (PB-DBD) is extremely popular in plasma catalysis applications, which can significantly improve the selectivity and energy efficiency of the catalytic processes. In order to achieve some complex chemical reactions, it is necessary to mix different materials in practical applications. In this work, based on the two-dimensional particle-in-cell/Monte Carlo collision (PIC/MCC) method, the discharge evolution in PB-DBD packed with two mixed dielectrics is numerically simulated to reveal the discharge characteristics. Due to the polarization of dielectric columns, the enhancement of electric field induces streamers at the bottom of the dielectric columns with high electrical permittivity (εr). The streamers propagate downward in the voids between the dielectric columns with low εr, which finally transitions into volume discharges. Then, a new streamer forms near the upper dielectric plate and propagates downward along the void of the dielectric columns with high εr. Moreover, electron density in between the columns with high εr is lower than that in between the dielectric columns with low εr. In addition, the numbers of e, N2+, O2+ and O2- present different profiles versus time. All of e, N2+ and O2+ increase in number before 0.8 ns. After 0.8 ns, the number of electrons decreases with time, while the numbers of N2+ and O2+ keep almost constant. During the whole process, the number of O2- keeps increasing versus time. The reason for the different temporal profiles can be analyzed as follows. The sum of electrons deposited on the dielectric and those lost in attachment reaction is greater than the number of electrons generated by ionization reaction, resulting in the declining electron trend. Comparatively, the deposition of N2+ and O2+ on the dielectric almost balances with their generation, leading to the constant numbers of N2+ and O2+. In addition, the variation of averaged electron density (ne) and averaged electron temperature (Te) in the voids between the dielectric columns are also analyzed under different experimental parameters. Simulation results indicate that both of them decrease with the increase in pressure or the decrease in voltage amplitude. Moreover, they increase with enlarging dielectric column radius. In addition, ne increases and then decreases with the increase of N2 content in the working gas, while Te monotonically increases. The variations of ne and Te in the voids can be explained as follows. With increasing pressure, the increase of collision frequency and the decrease of average free path lead to less energy obtained per unit time by electrons from the electric field, resulting in the decreasing Te. Moreover, the first Townsend ionization coefficient decreases with a reduction in Te, resulting in less electrons produced per unit time. Hence, both ne and Te decrease with increasing pressure. Additionally, Te is mainly determined by electric field strength. Therefore, the rising voltage amplitude results in the increase of and Te. Based on the same reason with pressure, nealso increases with increasing voltage amplitude. Consequently, both ne and Te increase with increasing voltage amplitude. In addition, the surface area of dielectric columns increases with enlarging dielectric column radius. Therefore, more polarized charges are induced on the inner surface of the dielectric column, inducing a stronger electric field outside. Accordingly, the enlarging dielectric column radius results in the increase of ne and Te. Moreover, the variation of ne with N2 content is analyzed from the ionization rate, and that of Te is obtained from analyzing the ionization thresholds of N2 and O2.
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Keywords:
- packed bed dielectric barrier discharge /
- particle-in-cell/Monte Carlo collision (PIC/MCC) /
- dynamics /
- streamer
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