Shock waves generated by arc plasma in supercritical (SC) CO2 have the potential to create novel reaction fields. However, there have been few studies of shock-wave characteristics in SC-CO2. This study provides the results of visualization of shock-wave propagation in SC-CO2 generated by nanosecond-pulsed arc plasma. A propagating cylindrical shock wave originating from a discharge channel was observed using time-resolved shadowgraph imaging. The shock wave separated from the cylindrical dark-region induced by pulsed arc plasma within 64 nanoseconds. The Mach numbers of the shock waves were investigated against the medium density of the CO2 ranging from a high-pressure gas phase to the SC phase. The Mach number reached a local maximum at the critical CO2 density level. The anomaly in the Mach number can be explained by the local maximum of the specific heat capacity ratio of the CO2 at close to the critical condition of SC-CO2.
雑誌名
Journal of Physics D: Applied Physics
巻
53
号
40
ページ
40LT01
発行年
2020-07-17
出版者
IOP Publishing
ISSN
0022-3727
DOI
10.1088/1361-6463/ab98c5
権利
This is the Accepted Manuscript version of an article accepted for publication in Journal of Physics D: Applied Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.1088/1361-6463/ab98c5.
著者版フラグ
author
引用
Journal of Physics D: Applied Physics, 53(40), art.no. 40LT01; 2020
Shock-wave propagation in supercritical CO2 induced by nanosecond-pulsed arc plasma
JPD53_40LT01.pdf
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