Three-dimensional chemical non-equilibrium simulation of an argon transferred arc with cross-flow

Sun, Su‐Rong; Zhu, Tao; Wang, Hai‐Xing; Liu, Gang; Murphy, Anthony B.

doi:10.1088/1361-6463/ab866e

Cited by 8 publications

(2 citation statements)

References 49 publications

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“…In the past few decades, some researchers tried to produce the large volume non-equilibrium region in the atmospheric arc plasmas using different methods. For example, a lateral cold gas cross-flowing was employed to generate a non-equilibrium plasma region near the anode surface in a high-intensity transferred arc [9][10][11][12]. Due to the strong interactions between the laterally injected cold gas and the arc column, a high heavy-particle temperature gradient region forms on the side facing the cross-flow accompanied by a large non-equilibrium region at the downstream of the cross-flow.…”

Section: Introductionmentioning

confidence: 99%

Production of a large volume non-equilibrium region in an atmospheric argon arc plasma with a counter injection of cold gas from an annular anode

Fang

Zhang

Wang

et al. 2023

J. Phys. D: Appl. Phys.

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In this letter, an annular anode is designed for producing arc plasmas with a large non-equilibrium region by using a counterflow cold gas through the annular anode. The coupled mass-momentum-energy exchange processes in an argon arc plasma are studied numerically and experimentally. The counter-injection of the cold argon gas from the center of the anode leads to a steep gradient of the heavy-particle temperature due to the formation of a thin stagnation layer resulting from the interaction of the high temperature plasma with the cold gas; and in particular, a large volume non-equilibrium “dark” plasma region is obtained above the anode surface. The results show that, with the enhancement of the convective heat transfer process in the plasma core region, the fraction of the non-equilibrium region to the whole arc plasma region reaches 92.2% where the heavy-particle temperature can be reduced significantly, e.g., ~ 2300 K, while simultaneously, the electron temperature and number density are remained at high levels greater than 8000 K and 2.4×1020 m-3, respectively, under the operating condition studied in this letter. This research not only deepens the understanding to the non-equilibrium synergistic transport mechanisms of arc plasmas, but also provides a method for producing a large volume non-equilibrium plasma region so as to promote various existing applications, or even creating new applications in the future.

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Section: Introductionmentioning

confidence: 99%

Production of a large volume non-equilibrium region in an atmospheric argon arc plasma with a counter injection of cold gas from an annular anode

Fang

Zhang

Wang

et al. 2023

J. Phys. D: Appl. Phys.

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“…Therefore thermodynamic and chemical non-equilibrium should be important features of the region near the anode protrusions and should be considered in the physical model. A reasonable chemical kinetic model should be used to simulate the effect of protrusions on arc anode attachment [31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the effects of protrusion on DC arc anode attachment

Niu¹,

Meng²,

Huang³

2021

Plasma Sci. Technol.

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The attachment of the DC arc on the anode is usually affected by surface morphology such as protrusions due to ablation or melting deformation. A three-dimensional thermodynamic and chemical non-equilibrium model is used to numerically simulate the effect of artificially assumed surface protrusions on the arc anode attachment. The numerical simulation results show that the arc deflects toward the protrusions on the anode and attaches to them in a constricted mode, resulting in an increase in the temperature of the arc attachment region. The analysis shows that the presence of protrusion on the anode surface changes the electric field distribution, intensifies the degree of thermodynamic and chemical non-equilibrium in its vicinity, further influences the chemical kinetic process of the plasma around it, which is the main reason for the deflection of the arc toward the protrusions and the arc anode attachment in a constricted mode. In order to verify the numerical simulation results, verification experiments are also performed using similar size scale anode protrusion, and the results showed that the presence of protrusion can indeed cause the deflection of the arc and even cause the ablation of the protrusion.

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