Effects of gas flow on oxidation reaction in liquid induced by He/O2 plasma-jet irradiation

Atsushi Nakajima, Giichiro Uchida, Toshiyuki Kawasaki, Kazunori Koga, Thapanut Sarinont, Takaaki Amano, Kosuke Takenaka, Masaharu Shiratani, Yuichi Setsuhara

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Abstract

We present here analysis of oxidation reaction in liquid by a plasma-jet irradiation under various gas flow patterns such as laminar and turbulence flows. To estimate the total amount of oxidation reaction induced by reactive oxygen species (ROS) in liquid, we employ a KI-starch solution system, where the absorbance of the KI-starch solution near 600nm behaves linear to the total amount of oxidation reaction in liquid. The laminar flow with higher gas velocity induces an increase in the ROS distribution area on the liquid surface, which results in a large amount of oxidation reaction in liquid. However, a much faster gas flow conversely results in a reduction in the total amount of oxidation reaction in liquid under the following two conditions: first condition is that the turbulence flow is triggered in a gas flow channel at a high Reynolds number of gas flow, which leads to a marked change of the spatial distribution of the ROS concentration in gas phase. Second condition is that the dimpled liquid surface is formed by strong gas flow, which prevents the ROS from being transported in radial direction along the liquid surface.

Original languageEnglish
Article number043301
JournalJournal of Applied Physics
Volume118
Issue number4
DOIs
Publication statusPublished - Jul 28 2015

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Nakajima, A., Uchida, G., Kawasaki, T., Koga, K., Sarinont, T., Amano, T., ... Setsuhara, Y. (2015). Effects of gas flow on oxidation reaction in liquid induced by He/O2 plasma-jet irradiation. Journal of Applied Physics, 118(4), [043301]. https://doi.org/10.1063/1.4927217