Regular Article

Concentration distributions and reaction pathways of species in the mass transfer process from atmospheric pressure plasma jet to water

¹ Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250014, P.R. China
² State Grid Jinan Power Supply Company, Jinan 250012, P.R. China

^a e-mail: sdnupanjie@163.com

Received: 25 March 2018
Received in final form: 13 July 2018
Published online: 11 October 2018

Abstract

Plasma–liquid interactions are becoming an increasingly significant topic in the field of low-temperature plasma science and technology. This work builds up a drift-diffusion model to numerically investigate concentration distributions and reaction pathways of various species in the mass transfer process from atmospheric pressure plasma jet (APPJ) to water. The simulation results indicate that H₂O₂ is a persistent molecular compound in the liquid phase region. Except for H₂O₂, the species concentrations of O₃ and OH are relatively higher in the shallow region of water. The species O₃, OH, and HO₂ have approximately the same penetration depth in the liquid region. H₂O₂ is primarily generated by O(¹D) + H₂O → H₂O₂ due to the continuous mass transfer of O(¹D) from APPJ to water. Furthermore, 2OH → H₂O₂ also produces a great deal of H₂O₂ in the liquid phase region.