Vol. 12, No.2, pp.64-68 (2019)
Characterizations of Electrical Discharge Plasma in Air Micro/Nano-Bubbles Water Mixture
C. Dechthummarong
Department of Electrical Engineering, Rajamangala University of Technology Lanna, Thailand
Abstract
In order to develop an underwater plasma source from the economic point of view as simple and inexpensive system, the electrical discharge plasma with a point-to-point electrode configuration was introduced into water mixture with air bubbling. The purposes of this study attempted to investigate on electrical discharge characteristics and the optical emission spectra from plasma of as well as the effects of chemical products in the water mixture. The water was mixed by a high bubble-number concentration and statistical value range of air micro/nano- bubble sizes that were 6.126 × 107 particles/ml and 700 nm to 7 μm, respectively. It was found that the initial DC ignition discharge voltage was 5 kV. A large number of multiple fast transient oscillations occurred on the current during spark discharge plasma under air micro/nano-bubbles (AMBs) water mixture. Moreover, the optical emission spectroscopy indicated that many beneficial reactive radical species such as OH-, O, Hα, Hβ, and nitrogen ion was detected. Furthermore, the results in chemical formations such as hydrogen peroxide (H2O2), and nitrate (NO3−) were compared between without and with AMBs water.
Keywords - Air micro/nano-bubble, fine bubble, underwater plasma discharge, plasma-chemical production