A Survey of Chemical Nonequilibrium in Argon Arc Plasma

Optical Emission Spectroscopic (OES) analysis for diagnostics of electron density and temperature in non-equilibrium argon plasma based on collisional-radiative model

“…The discrepancy of the electron energy distribution function (EEDF) from the Maxwellian has been also discussed with the CR model for the argon plasmas [49]. Even for the arc-discharge conditions, validity of the LTE condition is being examined in terms of the excitation population kinetics with the Ar-CR model [50]. Recently, the OES line-intensity measurement assisted with the CR model is being applied to understand the electron temperature of atmospheric-pressure discharge argon-based plasmas for various applications of material applications [51][52][53][54][55], energy applications [56][57][58], or aeronautical applications [59].…”

Numerical analysis of chemical reaction processes in different anode attachments of a high‐intensity argon arc

“…Therefore, continuous attention has been paid on the study on the mechanisms of different arc‐anode attachment modes. A series of investigations has been conducted to investigate arc‐anode attachment phenomena, including experimental studies and numerical simulations . However, in spite of extensive efforts in this field, our knowledge of arc attachments on anode is still incomplete.…”

“…Trelles used a time‐dependent three‐dimensional thermodynamic non‐equilibrium model to obtain self‐organized patterns of anode attachment spots in a free‐burning arc . Recently, the chemical non‐equilibrium characteristics in arc column and its near anode region have been investigated by Baeva . The diffuse and constricted arc attachment modes are demonstrated depending on the mass flow rate.…”

“…A series of investigations has been conducted to investigate arc-anode attachment phenomena, including experimental studies [1][2][3][4][5][6][7][8][9] and numerical simulations. [10][11][12][13][14][15][16][17][18][19] However, in spite of extensive efforts in this field, our knowledge of arc attachments on anode is still incomplete. One of the important reasons is that there are significant deviations from local thermodynamic equilibrium (LTE) and chemical equilibrium near the anode region.…”

“…[24][25][26] Recently, the chemical non-equilibrium characteristics in arc column and its near anode region have been investigated by Baeva. [10,27] The diffuse and constricted arc attachment modes are demonstrated depending on the mass flow rate. It was found that the distributions of electron density over the entire distance to the anode are different for diffuse and constricted arc attachment modes.…”