Streamer-Based Discharge on Water–Air Interface as a Source of Plasma-Activated Water: Conceptual Design and Basic Performance

0581970 - ÚFP 2024 RIV DE eng J - Journal Article
Hoffer, Petr - Niedoba, Krzysztof - Jirásek, Vít - Prukner, Václav - Šimek, Milan
Streamer-Based Discharge on Water–Air Interface as a Source of Plasma-Activated Water: Conceptual Design and Basic Performance.
Plasma Chemistry and Plasma Processing. Roč. 43, č. 6 (2023), s. 1531-1547. ISSN 0272-4324. E-ISSN 1572-8986
R&D Projects: GA ČR(CZ) GA18-12386S
Institutional support: RVO:61389021
Keywords : Plasma * Plasma chemistry * Surface discharge * Water * Water treatment
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 3.6, year: 2022
Method of publishing: Open access
https://link.springer.com/article/10.1007/s11090-023-10325-y

Here we propose a geometrical analogue of a surface coplanar DBD electrode system allowing the generation of multiple filamentary discharges expanding along the surface of a thin water layer in a flow-through type reactor. A stable layer of deionized/tap water is maintained by a constant flow and separates active discharge filaments from the submerged metal electrodes. Discharges are produced by the application of periodic bipolar high-voltage pulses with a repetition frequency of tens of hertz and lasting a few microseconds. The duration of the high-voltage pulses combined with the non-zero water conductivity allows a partial transition of the initial cold streamer phase to the hot spark phase. Plasma-induced optical emission analysis showed significant heating of the developed filaments (850 K) and increased electron number density (4·1017 cm−3), proving the streamer to spark transition. The analysis of the dissolved products of the discharges showed the maximum NO2− and H2O2 production yields of 35 and 30 mmol·kWh−1, respectively. The current conceptual design is easily scalable by adding pairs of high voltage and grounded compartments with additional water inlets/outlets or by extending the length of the blade separating two adjacent compartments.
Permanent Link: https://hdl.handle.net/11104/0350107