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- W3104590592 abstract "Packed bed plasma reactors (PBPRs) inherently have complex geometries where the volume between the electrodes is filled with dielectric/catalytic pellets to form an array of voids and cavities. This design generates multiple length scales i.e. the dimension of the plasma region (of the order of centimeters), of the dielectric/catalytic pellets (of the order of millimeters) and of the void between the dielectrics (or cavities) and/or surface pores that can reach micrometer dimensions. The plasma is formed as an array of connected or segmented microdischarges. The understanding of plasma propagation on these diverse length scales is important in optimizing and controlling this process. In this work, we investigate the discharge formation and propagation at different length scales as a function of applied voltage in a simplified design of PBPRs, a patterned dielectric barrier discharge (p-DBD), operated in helium at atmospheric pressure, using phase and space resolved optical emission spectroscopy (PROES). The p-DBD is based on an array of plasma facing glass hemispheres implemented into one of two electrodes and regularly arranged in a hexagonal pattern. The plasma is initiated as filamentary microdischarges at the positions of minimum gap followed by radial acceleration of electrons over the dielectric surface as surface ionization waves to finally form surface microdischarges at the voids between the pellets, i.e. at the contact points. With the increase of the voltage amplitude, subsequent pulses of surface microdischarges are generated at the contact points. The plasma emission of each of the surface micro-discharges (S-MD) is found to consist of microscopic structures whose emission intensity increases as a function of the driving voltage amplitude. Adjacent microdischarges interact to generate a wave-like emission intensity propagation from the center of the array to the edges." @default.
- W3104590592 created "2020-11-23" @default.
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- W3104590592 date "2020-11-08" @default.
- W3104590592 modified "2023-09-27" @default.
- W3104590592 title "Plasma propagation dynamics in a patterned dielectric barrier discharge at different length scales" @default.
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