Abstract
The surface and volume discharge enhancement phenomena and streamer propagation direction control in catalytic pores are significant for the plasma catalytic degradation of pollutants. In this work, we use a two-dimensional particle-in-cell with Monte Carlo collisions model to explore the effect of lateral voltage on streamer enhancement and streamer propagation control for different driving voltages in pores of various shapes, sizes, and numbers. The driving voltage is applied to the top of the device, while the lateral voltages are applied at the left and right sides of the device. The surface and volume discharge enhancement phenomena become more significant and streamer propagation is more restricted within a narrow channel as the lateral voltage (with the same values on the left and right sides) increases from −5 kV to −30 kV for a fixed driving voltage of −20 kV. In this case, both the volume and surface discharges are intensive, leading to highly concentrated plasma species in a narrow channel. Moreover, the streamer propagates in a straight direction, from top to the bottom plate, with the lateral voltage added on both sides. The streamer propagation, however, deviates from the center and is directed to the right side when the lateral voltage is applied to the left. Our calculations also indicate that increasing the number or size of the pores enhances both the volume and surface discharges.
Highlights
Due to the selectivity of catalytic materials and the high activity of plasma, plasma catalysis has been successfully applied to environmental protection activities
We found that the surface discharge is enhanced on the surfaces of the catalyst pores compared with the micro-discharge inside the catalyst pores
When the left and right voltages are −30 kV, the volume discharge is stronger than the surface discharge
Summary
Due to the selectivity of catalytic materials and the high activity of plasma, plasma catalysis has been successfully applied to environmental protection activities. Zhang et al [36] implemented a two-dimensional fluid model for various pore sizes to investigate the generation and propagation of plasma catalysis micro-discharge. Their calculations indicated that the plasma could propagate into catalyst pores in the μm range and affect the plasma catalytic process. In this work, we use a two-dimensional explicit PIC/MCC model to investigate the effect of the lateral voltage on the properties of streamer formation and propagation in a DBD reactor containing numerous pores with smooth boundaries.
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