Computer-controlled plasma emission spectroscopy

Etemadi, K.; Pfender, E.

doi:10.1063/1.1136940

Cited by 21 publications

(3 citation statements)

References 4 publications

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“…A further consequence is that there is an inflow of gas from the outside along the anode's surface and the outflow of gas from the computational domain is along the bottom surface of the constrictor. The contours of the electron temperature are shown in figure 14 for various mass-flow rates with the experimental results (Etemadi 1982). Although the mass-flow rate of plasma gas has not been measured in the experiment, the calculated results are in good agreement with the experimental results for assumed mass-flow rates of 0.02 g s −1 .…”

Section: Results For a Constricted Anode Attachmentsupporting

confidence: 55%

Anode-boundary-layer behaviour in a transferred, high-intensity arc

Amakawa

Jenista

Heberlein

et al. 1998

J. Phys. D: Appl. Phys.

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The effects of the plasma's gas-flow rate on phenomena such as the negative anode fall and the heat flux to the anode in high-intensity arcs are discussed on the basis of a numerical model of the anode's boundary layer. The modelling system consists of a rotationally symmetrical argon plasma formed between the outlet of a constrictor tube and a water-cooled flat copper anode perpendicular to the axis of the plasma flow which is directed towards the anode. The arc is operated at atmospheric pressure and at a current level of 200 A. The boundary conditions for the electron temperature and the electron number density at the anode's surface are obtained by solving the electron-energy equation and the diffusion equation at the anode's surface simultaneously with all conservation equations for the calculation domain. A diffuse anode attachment is obtained for a mass flow rate exceeding 0.2 g and a constricted anode attachment is found for rates below 0.02 g . There is a (probably unstable) transition region between these flow rates. The anode boundary layer of the diffuse attachment is strongly affected by the mass-flow rate. Increasing the mass-flow rate shifts the location of the peak of the electrical potential towards the anode while its magnitude decreases and the total heat flux to the anode increases. This is a consequence of the effects of the mass-flow rate on the axial profiles of electron and heavy-particle temperatures and of the electron number density. In contrast, the anode boundary layer of the constricted attachment seems not to be affected by the mass-flow rate.

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Section: Results For a Constricted Anode Attachmentsupporting

confidence: 55%

Anode-boundary-layer behaviour in a transferred, high-intensity arc

Amakawa

Jenista

Heberlein

et al. 1998

J. Phys. D: Appl. Phys.

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“…Depending on the temperature, the Rayleigh scatter measurement may be replaced by either the Thompson or the resistance scatter measurements. 6,[18][19][20][21] Figure 6 shows the range of applications of each of these methods.…”

Section: Methods Of High-speed Photographymentioning

confidence: 99%

Determination of GTA and GMA welding arc temperatures

Węglowski¹

2005

Welding International

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“…The source of this type of radiation in the arc welding is mainly plasma arc column, but also the metal transported by the arc, slag, and the surface of the welded components (Etemadi K., Pfender E., 1982). The energy regions close to the anode and cathode arc are consumed for heating and melting of the electrode and the base material.…”

Section: Arc Light Radiationmentioning

confidence: 99%