Radio-frequency capacitive discharge with flowing liquid electrodes at reduced gas pressures
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MA DIAGNOSTICS
Radio-Frequency Capacitive Discharge with Flowing Liquid Electrodes at Reduced Gas Pressures Al. F. Gaisina, *, E. E. Sonb, and S. Yu. Petryakova a Tupolev
Kazan National Research Technical University, Kazan, Republic of Tatarstan, 420111 Russia Institute for High Temperatures, Russian Academy of Sciences, Moscow, 127412 Russia *e-mail: [email protected]
b Joint
Received October 3, 2016; in final form, January 31, 2017
Abstract—Results are presented from experimental studies of the electrophysical and spectral characteristics of the low-temperature plasma of a radio-frequency capacitive discharge excited between two flowing liquid electrodes at gas pressures of 103−105 Pa. The plasma composition, the electron density, and the vibrational and rotational temperatures of gas molecules are estimated. The types and shapes of discharge are described, and the thermal and gas-hydrodynamic processes in the discharge zone are analyzed. DOI: 10.1134/S1063780X17070054
1. INTRODUCTION In recent years, the low-temperature plasma of an electric discharge with liquid electrodes has attracted considerable interest from the standpoint of both fundamental and applied research. This type of the discharge is excited by a dc or an ac field between two electrodes, one (or both) of which is flowing or stagnant liquid. Of fundamental interest are the electrophysical and spectral characteristics of the discharge, the distributions of the densities and energies of the plasma components, the types and shapes of the discharge, the theory and numerical simulation of the breakdown and burning stages of the discharge, the thermal and gas-hydrodynamic processes at the interface between different media, and the interaction of the discharge plasma with materials and products of various physical nature. This type of plasma is efficiently applied in various branches of industry, machine building, metal working, and medicine. Machine building and metal working meet problems in treating surfaces of complicated geometry and products with well-developed outer and inner surfaces, including those manufactured using additive technologies. In medicine, the problems of sterilization of special instruments and disinfection of rooms and water still remain very challenging. The physics and applications of discharges with liquid electrodes have been investigated by experts from different scientific schools. Analysis of the available literature shows that dc discharges with liquid electrodes have received little study, while radio-frequency capacitive (RFC) discharges (the principles of an RFC discharge operating between solid electrodes were described in detail, e.g., in [1–3]) with liquid
electrodes still remain almost unexplored., There are several groups of Russian [4–15] and foreign [16–20] scientists working in this field. Currently, the development of numerical models describing mechanisms of an RFC discharge operating between two liquid electrodes is impeded because such discharges are poorly studied. The goal of this work was to experimen
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