Discharge characteristics of DC arc water plasma for environmental applications

Tianming Li, Sooseok Choi, Takayuki Watanabe

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


A water plasma was generated by DC arc discharge with a hafnium embedded rodtype cathode and a nozzle-type anode. The discharge characteristics were examined by changing the operation parameter of the arc current. The dynamic behavior of the arc discharge led to significant fluctuations in the arc voltage and its frequency. Analyses of the high speed image and the arc voltage waveform showed that the arc discharge was in the restrike mode and its frequency varied within several tens of kilohertz according to the operating conditions. The larger thermal plasma volume was generated by the higher flow from the forming steam with a higher restrike frequency in the higher arc current conditions. In addition, the characteristics of the water plasma jet were investigated by means of optical emission spectroscopy to identify the abundant radicals required in an efficient waste treatment process.

Original languageEnglish
Pages (from-to)1097-1101
Number of pages5
JournalPlasma Science and Technology
Issue number12
Publication statusPublished - Dec 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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