Effects of gas temperature in the plasma layer on RONS generation in array-type dielectric barrier discharge at atmospheric pressure

• Published in: Physics of plasmas 2017-12, Vol.24 (12)
• Main Authors: Yoon, Sung-Young, Yi, Changho, Eom, Sangheum, Park, Seungil, Kim, Seong Bong, Ryu, Seungmin, Yoo, Suk Jae
• Format: Article
• Language: English
• Subjects: Dielectric barrier discharge; Gas composition; Gas flow; Gas temperature; Infrared cameras; Low flow; Maintenance costs; Optical emission spectroscopy; Plasma; Plasma jets; Plasma physics; Spectrum analysis
• ISSN: 1070-664X; 1089-7674
• DOI: 10.1063/1.5003205

In this work, we studied the control of plasma-produced species under a fixed gas composition (i.e., ambient air) in a 10 kHz-driven array-type dielectric barrier atmospheric-pressure plasma discharge. Instead of the gas composition, only the gas velocity was controlled. Thus, the plasma-maintenance cost was considerably lower than methods such as external N2 or O2 injection. The plasma-produced species were monitored using Fourier transformed infrared spectroscopy. The discharge properties were measured using a voltage probe, current probe, infrared camera, and optical emission spectroscopy. The results showed that the major plasma products largely depend on the gas temperature in the plasma discharge layer. The gas temperature in the plasma discharge layer was significantly different to the temperature of the ceramic adjacent to the plasma discharge layer, even in the small discharge power density of ∼15 W/cm2 or ∼100 W/cm3. Because the vibrational excitation of N2 was suppressed by the higher gas flow, the major plasma-produced species shifted from NOx in low flow to O3 in high flow.