Pulsed electrical discharge in bubbled water

S. Gershman, O. Mozgina, A. Belkind, K. Decker, E. Kunhardt

Research output: Contribution to journalArticle

Abstract

Electrical discharges in water are used for generating hydrogen peroxide, ozone, hydroxyl and oxygen radicals, and other chemically active species for disinfection and purification of water. The interest in electrical discharges in bubbled water is motivated by the need to reduce the power consumption for igniting the discharge. Understanding the electrical and optical characteristics of the discharge will help guide the design of future purification systems. Here we report results of investigations that focus on the study of pulsed electrical discharges in a single bubble of oxygen or argon in water. The single-bubble system consists of a negative needle electrode inside a gas bubble in water and a disk electrode separated from the needle electrode by 5 - 10 mm of water. The bubble is stationary and is subjected to repeated 3-15 kV, 1 μs long voltage pulses. At these voltage levels, the discharge process is confined to the bubble with the water serving as a dielectric material covering the disk electrode. During a single voltage pulse multiple ∼100 ns long discharges occur in the bubble. These discharges deposit sufficient amount of charge on the surface of the bubble to generate a reverse-polarity discharge during the voltage shut-off. Experiments with Ar and O2 bubbles show the same optical emission intensity at 309 ± 5 nm (OH emissions). These results indicate that OH radicals are generated by electron-driven processes in water vapor present in all bubbles.

Original languageEnglish (US)
Pages (from-to)19-25
Number of pages7
JournalContributions to Plasma Physics
Volume47
Issue number1-2
DOIs
StatePublished - 2007

Fingerprint

bubbles
water
electrodes
electric potential
purification
needles
hydroxyl radicals
oxygen
pulses
hydrogen peroxide
ozone
light emission
water vapor
polarity
coverings
deposits
argon
gases
electrons

Keywords

  • Bubbled water
  • Pulsed discharge
  • Water discharge

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Condensed Matter Physics

Cite this

Pulsed electrical discharge in bubbled water. / Gershman, S.; Mozgina, O.; Belkind, A.; Decker, K.; Kunhardt, E.

In: Contributions to Plasma Physics, Vol. 47, No. 1-2, 2007, p. 19-25.

Research output: Contribution to journalArticle

Gershman, S, Mozgina, O, Belkind, A, Decker, K & Kunhardt, E 2007, 'Pulsed electrical discharge in bubbled water', Contributions to Plasma Physics, vol. 47, no. 1-2, pp. 19-25. https://doi.org/10.1002/ctpp.200710004
Gershman, S. ; Mozgina, O. ; Belkind, A. ; Decker, K. ; Kunhardt, E. / Pulsed electrical discharge in bubbled water. In: Contributions to Plasma Physics. 2007 ; Vol. 47, No. 1-2. pp. 19-25.
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