Numerical Investigation of a Local Oxygen Injection Effect on Argon Induction Plasmas Using a Chemically Non-Equilibrium Model

Abstract

Effective generation of chemical reactive species in thermal plasmas has been required in the field of material processing and waste treatment. The effect of oxygen injection into argon induction plasmas was investigated by numerical analysis without chemical equilibrium assumptions. Reaction kinetics rates of the dissociation and recombination of oxygen as well as the ionization were taken into account. The transport properties were estimated using higher-order approximation of the Chapman-Enskog method for required accuracy. Oxygen dissociation and heat flux to a torch wall can be controlled by oxygen injection location. Therefore, suitable oxygen injection needs to be chosen according to the application requirement. The present modeling would give more precise information and provide the guidance for the rational design of new material processing with effective reactive gas injection into plasmas.

Modeling of the High Frequency Plasma Reactive Synthesis of Titanium Dioxide Nanoparticles

“…It has only energy exchange with environment, but not mass exchange. This assumption is reasonable because plasma torch and cooling gas are coaxial injected in high velocity, and their flow field are laminar [6], so their mixing can be neglected in reaction chamber that is 0.04m in length. Study region can be approximately regarded as a annular region , as Fig.…”

Water Plasmas for Environmental Application

“…Thermal plasmas provide the advanced tool for waste treatment. For the environmental problems, thermal plasmas have received much attention due to their high chemical reactivity, easy and rapid generation of high temperature, high enthalpy to enhance the reaction kinetics, oxidation and reduction atmosphere in accordance with required chemical reaction, and rapid quenching capability (10 5 -10 6 K s −1 ) to produce chemical nonequilibrium compositions [1][2][3][4][5][6][7][8][9]. Thermal plasmas have been widely applied to many fields because of these advantages.…”

Progress of computational plasma fluid mechanics

“…Many simulations for thermal plasma flows have been carried out with a steady-state restriction by neglecting the transient terms in the governing equations. [8][9][10][11][12][13][14][15][16][17][18] However, fluid phenomena, even for air flow at RT, are naturally unsteady and often accompanied with fluctuations and vortex generation due to hydrodynamic instabilities. [19][20][21][22][23][24] To capture those features, time-dependent simulation is to be performed with a computational method capable of solving the governing equations accurately, as discussed and demonstrated in the following subsections.…”