Influence of gas flow on argon microwave plasma jet at atmospheric pressure

Abstract

Many kinds of an atmospheric-pressure plasma jet has been developed and used for widespread applications such as a surface treatment and modified. This study focused on the argon atmospheric-pressure microplasma jet generated by discharging of RF power of 2.45GHz microwave. The plasma jet shows sensitivity to surrounding environment; pressure, temperature and gaseous species. It is therefore absolutely imperative that a nature of atmospheric-pressure plasma jet should be understood from a point of fluid dynamics. This study, therefore, focused on the interrelationship between the plasma jet and the working gas.Motion of the plasma jet and the working gas were evaluated by velocity measurement and fast photography. As a result, the unsteady sinusoidal waving motion in the radial direction of a torch was observed. Advection velocity of the plasma in just downstream region of the torch exit increases with the supplying flow rate, and the velocity ratio is in the range of 0.75-0.87.

Design of a Novel Microwave Plasma Source Based on Ridged Waveguide

“…Air and argon are used as working gases. Under atmospheric pressure, these two parameters can be measured at different gas flow rates [19,20]. Lower power value (exciting power; sustaining power) shows lower energy consumption required by the plasma source.…”

The Influence of Discharge Capillary Size, Distance, and Gas Composition on the Non-Equilibrium State of Microplasma

“…In recent years, the growing interest in the field of microplasmas in various gases at atmospheric pressure was perceived on account of their reduced dimensions (from μm to several mm), stable operation at atmospheric pressure, non‐thermal and non‐equilibrium characteristics, high electron densities, and non‐Maxwellian electron energy distributions . These atmospheric pressure microplasmas have manifold advantages over low pressure plasmas because of their low investment and operational costs, low power consumption, portability, and easy‐to‐use principles which do not require any vacuum equipment for their generation .…”

Influence of the Probe Electrode on Probe Measurements for Atmospheric Pressure Microwave Plasma Torch

“…Hence, it is important to obtain fundamental physical parameters of the plasma such as electron temperature, electron density, ion temperature in order to characterize the property. So far, we have investigated the structure of an atmospheric pressure plasma torch [8] as basic study. A lot of efforts to estimate the accurate values under atmospheric pressure have been done [2][3][4][5][6].…”

“…However, it is known that the probe electrode disturbs the plasma structure especially for small-scale atmospheric plasmas [7]. So far, we have investigated the structure of an atmospheric pressure plasma torch [8] as basic study. Furthermore, hydrogen oxidation processing system using the atmospheric plasma torch has been developed as application for tritium recovery in fusion facilities [9].…”