Numerical Study of High-Intensity Free-Burning Arc

Menart, James; Lin, Lanchao

doi:10.2514/2.6396

Cited by 30 publications

(37 citation statements)

References 11 publications

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“…The density, the specific heat at constant pressure and the radiation loss of the argon-potassium mixed plasma are replaced with those of the argon plasma since the seed fraction is very small in the present study [11,12]. The variation of the thermal conductivity caused by Table 1 Transport variables and the source terms for the governing equations (1)…”

Section: Plasma Modelmentioning

confidence: 99%

Computational simulation of a particle-laden RF inductively coupled plasma with seeded potassium

Shigeta

Sato

Nishiyama

2004

International Journal of Heat and Mass Transfer

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Section: Plasma Modelmentioning

confidence: 99%

Computational simulation of a particle-laden RF inductively coupled plasma with seeded potassium

Shigeta

Sato

Nishiyama

2004

International Journal of Heat and Mass Transfer

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“…The temperature-dependent thermodynamic and transport properties of argon, which include the effects of ionization in LTE, were obtained from the literature [39]. Temperature-dependent radiation was referred from the literature [40]. The material properties of tungsten and iron were obtained from the database [41].…”

Section: Model Descriptionmentioning

confidence: 99%

Numerical Analysis of the Correlation between Arc Plasma Fluctuation and Nanoparticle Growth–Transport under Atmospheric Pressure

2019

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A time-dependent two-dimensional (2D) axisymmetric simulation was conducted for arc plasma with dynamically fluctuating fluid generating iron nanoparticles in a direct-current discharge condition. The nonequilibrium process of simultaneous growth and transport of nanoparticles is simulated using a simple model with a low computational cost. To ascertain fluid dynamic instability and steep gradients in plasma temperature and particle distributions, a highly accurate method is adopted for computation. The core region of the arc plasma is almost stationary, whereas the fringe fluctuates because of fluid dynamic instability between the arc plasma and the shielding gas. In the downstream region, the vapor molecules decrease by condensation. The nanoparticles decrease by coagulation. These results suggest that both of the simultaneous processes make important contributions to particle growth. The fluctuation of nanoparticle number density in a distant region exhibits stronger correlation with the temperature fluctuation at the plasma fringe. The correlation analysis results suggest that the distribution of growing nanoparticles distant from the arc plasma can be controlled via control of temperature fluctuation at the arc plasma fringe.

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“…The thermodynamic and transport properties of argon, tungsten and stainless steel are given as a function of temperature. 10,[15][16][17][18][19][20][21] The viscosity in the solid-liquid mushy zone is as a function of liquid fraction. Figures 2(a) and 2(b) show the effect of sulfur content on the temperature fields of arc and molten pool.…”

Section: Governing Equationsmentioning

confidence: 99%

Computational Simulation of Arc Melting Process with Complex Interactions

et al. 2006

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The real-time computational simulation of arc melting process with considering complex interactions and solid-liquid mushy zone in molten anode has been successfully conducted to provide the fundamental data for highly economical performance of arc melting process. The configuration of molten anode predicted by realistic numerical model shows the quantitative agreement with the experimental data. The effects of sulfur content concentration in molten metal, arc current and cathode vertex angle on the welding structure is discussed in detail. Finally, the heat exchange efficiency and molten cross-sectional area are evaluated under different arc currents and cathode vertex angles for optimum welding process with high efficiency.KEY WORDS: arc melting system; complex interactions; mushy zone; real-time computational simulation.(8) Evaporation, deformation and charge on the molten anode surfaces are neglected for simplicity. (9) Evaporation, melting and deformation on the cathode surface are neglected for simplicity. Under these assumptions, the governing equations for arc and electrodes region are presented as follows.Conservation c Ar c Ar The initial conditions of arc melting process are the steady thermofluid fields of arc without melting anode. Table 1 shows the system configuration and operating conditions. The thermofluid field is solved by SemiImplicit-Method for Pressure Linked Equation (SIMPLE) method 14) using Tri Diagonal-Matrix Algorithm (TDMA). The electromagnetic field is solved by SOR method. In this study, 90 grid points are adopted in both axial and radial directions. The thermodynamic and transport properties of argon, tungsten and stainless steel are given as a function of temperature. 10,[15][16][17][18][19][20][21] The viscosity in the solid-liquid mushy zone is as a function of liquid fraction. Numerical Conditions and Procedures 22) Numerical Results and DiscussionFigures 2(a) and 2(b) show the effect of sulfur content on the temperature fields of arc and molten pool. The steady state of molten pool is obtained approximately 20 s after arc generation. It is found that sulfur content does not affect the arc flow so much even near interface, however, the welding structure changes drastically by sulfur content. In the case of low sulfur content in SUS304 as shown in Fig. 2(a), the molten metal spreads outward. On the other hand, in the case of high sulfur content in SUS304, the molten pool penetrates downward in the core region.Figures 3(a) and 3(b) show the four kinds of driving forces which affects surface flow induced on the molten pool corresponding as shown in Figs. 2(a) and 2(b). In the case of low sulfur content in SUS304, shear force resulting from cathode jet is stronger at the inner molten region but surface tension is stronger at the outer molten region. Then, total driving force shows positive at the inner molten region but negative at the outer one, which induce the outward and inward flows correspondingly. On the other hand, in case of high sulfur content in SUS304, surface tension...

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Numerical Study of High-Intensity Free-Burning Arc

Cited by 30 publications

References 11 publications

Computational simulation of a particle-laden RF inductively coupled plasma with seeded potassium

Computational simulation of a particle-laden RF inductively coupled plasma with seeded potassium

Numerical Analysis of the Correlation between Arc Plasma Fluctuation and Nanoparticle Growth–Transport under Atmospheric Pressure

Computational Simulation of Arc Melting Process with Complex Interactions

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