Journal ArticleDOI
The influence of iron vapour on an argon transferred arc
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TLDR
In this article, a transferred arc was operated with a current intensity of 90 A, an arc length of 18 mm, and a gas flow rate of. Temperature and relative iron concentration profiles determined experimentally were compared to theoretical values obtained from a two-dimensional model based on mass, momentum, and energy conservation equations and taking into account anode erosion.Abstract:
Spectroscopic measurements have been made on a transferred arc burning in pure argon at atmospheric pressure seeded with iron vapours arising from the anode erosion. The transferred arc was operated with a current intensity of 90 A, an arc length of 18 mm, and a gas flow rate of . Temperature and relative iron concentration profiles determined experimentally were compared to theoretical values obtained from a two-dimensional model based on mass, momentum, and energy conservation equations and taking into account anode erosion. This comparison partially validated the model and showed that the presence of iron vapours, with a relative concentration of about 0.1%, led to a temperature decrease of about 1000 K. Differences between experimental and calculated temperature fields may be due to departures from equilibrium and to uncertainties about the iron vapour concentration and the radiative losses.read more
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A numerical modelling of an electric arc and its interaction with the anode: Part I. The two-dimensional model
TL;DR: In this article, a two-dimensional numerical model of the interaction between an electric arc and a solid anode of different types is presented, where the CFD commercial code FLUENT is used to model the plasma flow and the solid anodes domain.
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Numerical Study of a Free-Burning Argon Arc with Copper Contamination from the Anode
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TL;DR: In this paper, a free-burning argon arc with copper vapor contamination from the anode was modeled and the results of the analysis were compared to those from pure argon arcs.
References
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Numerical heat transfer and fluid flow
TL;DR: In this article, the authors focus on heat and mass transfer, fluid flow, chemical reaction, and other related processes that occur in engineering equipment, the natural environment, and living organisms.
Journal ArticleDOI
Study of the free‐burning high‐intensity argon arc
K. C. Hsu,K. Etemadi,E. Pfender +2 more
TL;DR: In this paper, the maximum current density in the vicinity of the cathode was determined by measuring the size of the molten cathode tip (thoriated tungsten) for a given arc current.
Journal ArticleDOI
Lifetimes, transition probabilities, and level energies in Fe i
TL;DR: In this article, the authors used time-resolved laser-induced fluorescence to measure the lifetime of 186 Fe levels with energies between 25 900 and 60 758 cm and derived precise Fe level energies to support the automated method that is used to identify transitions in our spectra.
Journal ArticleDOI
Excitation equilibria in plasmas; a classification
TL;DR: In this article, the authors follow and continue the line of Bibermanl, Fujimoto, and Seaton by trying to find a classification in these results and find a (analytical) relation between the atomic state distribution function and the underlying plasma properties.
Journal ArticleDOI
Measurement of Emission and Absorption of Radiation by an Argon Plasma
D. L. Evans,R. S. Tankin +1 more
TL;DR: In this article, a volumetric radiative loss measurement was made on an argon plasma, correlated with temperature in the range of 10 000 to 26 000°K, and the results were made on the 6965 Ar I line yielding lineshifts, halfwidths, absorption and emission coefficients.