期刊
PLASMA SOURCES SCIENCE & TECHNOLOGY
卷 24, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0963-0252/24/3/035026
关键词
plasma jet; atmospheric pressure plasma; humid air; repetitive pulsing; RONS (reactive oxygen nitrogen species); model
资金
- Department of Energy Office of Fusion Energy Science [DE-SC0001319]
- National Science Foundation [CHE-1124724]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1124724] Funding Source: National Science Foundation
Atmospheric pressure plasma jets have many beneficial effects in their use in surface treatment and, in particular, plasma medicine. One of these benefits is the controlled production of reactive oxygen and nitrogen species (RONS) in the active discharge through the molecular gases added to the primary noble gas in the input mixture, and through the interaction of reactive species in the plasma effluent with the ambient air. In this computational investigation, a parametric study was performed on the production of RONS in a multiply pulsed atmospheric pressure plasma jet sustained in a He/O-2 mixture and flowing into ambient humid air. The consequences of flow rate, O-2 fraction, voltage, and repetition rate on reactant densities after a single discharge pulse, after 30 pulses, and after the same total elapsed time were investigated. At the end of the first discharge pulse, voltage has the greatest influence on RONS production. However, the systematic trends for production of RONS depend on repetition rate and flow rate in large part due to the residence time of RONS in the plasma zone. Short residence times result in reactive species produced by the previous pulse still being in the discharge tube or in the path of the ionization wave at the next pulse. The RONS therefore accumulate in the tube and in the near effluent on a pulse-to-pulse basis. This accumulation enables species requiring multiple reactions among the primary RONS species to be produced in greater numbers.
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