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Mode transition and plasma characteristics of nanosecond pulse gas–liquid discharge: Effect of grounding configuration
Author(s) -
Wang Sen,
Yang DeZheng,
Zhou Rusen,
Zhou Renwu,
Fang Zhi,
Wang Wenchun,
Ostrikov Kostya Ken
Publication year - 2020
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201900146
Subject(s) - plasma , nanosecond , transient (computer programming) , streamer discharge , dielectric , materials science , electric discharge in gases , atomic physics , spark gap , voltage , ground , spark discharge , spark (programming language) , optics , electrical engineering , optoelectronics , laser , physics , quantum mechanics , computer science , engineering , operating system , programming language
Transitions between the streamer and spark modes affect the stability of gas–liquid discharges, limiting their practical applications, while the nature of such transitions is poorly understood. Here we clarify the often neglected effect of a dielectric on the gas–liquid discharge stability, using direct and indirect grounding configurations. Discharge modes and plasma characteristics in these two configurations are investigated. The discharge appears in a transient spark mode in the direct grounding while in a streamer mode in the indirect case. It is shown that the dielectric significantly improves the discharge stability. The gas temperature and electron density in the transient spark are 380 K and 10 17 /cm 3 with a 30 kV pulse voltage, respectively, which are higher than those in the streamer mode.