Determination of plasma velocity from light fluctuations in a dc plasma torch

Singh, Nityalendra; Razafinimanana, Manitra; Hlína, J.

doi:10.1088/0022-3727/33/3/314

Cited by 10 publications

(13 citation statements)

References 18 publications

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“…The Joule heat dissipated per unit length of the electric arc is about 3 kW/40 mm and 7 kW/40 mm (the arc length is 40 mm) for the respective flow rates and currents, which is comparable with the values calculated in [8] for a similar torch configuration. The velocity measurements described and compared with numerical calculations in [16] suggest that numerical results, including our predictions, tend to overestimate the observational data. The velocity measurements described and compared with numerical calculations in [16] suggest that numerical results, including our predictions, tend to overestimate the observational data.…”

Section: The Time Derivative Of Each Of the Unknowns Is Decreased (Inmentioning

confidence: 69%

Modelling of an argon plasma flow

Kotalík

2005

Czech J Phys

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One-fluid MHD equations are numerically solved for an axisymmetric flow of argon inside and outside a discharge chamber of a cascaded plasma torch. Arc currents of 100 and 150 A, flow rates of 10 and 30 slpm, and two different optical thicknesses are assumed. The flow is shown to be only weakly compressible, of the Mach number below 0.3. The calculated torch powers range from 3 to 7 kW, the energy lost by radiation is (1-3) kW. Axial velocities of (200-600) m/s and temperatures of (12 500-14 400) K are found at the torch nozzle exit and compared with available experimental data. Inside the chamber, several recirculation zones are predicted. The physical model and the chamber shape used can readily be extended for a hybrid plasma torch with the simultaneous stabilization of the electric arc inside the chamber by argon and, e.g., water swirl.PACS : 52.75.Hn, 52.65.Kj

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Section: The Time Derivative Of Each Of the Unknowns Is Decreased (Inmentioning

confidence: 69%

Modelling of an argon plasma flow

Kotalík

2005

Czech J Phys

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“…In practice, most of the available experimental data are related to spectroscopic Girard et al, 2006) and probe (Prevosto et al, 2008a(Prevosto et al, , 2008b(Prevosto et al, , 2009a) measurements in the external plasma region (the outer region between the nozzle exit and the anode, where the pressure has relatively small variations about the atmospheric value), giving information of only part of the variables involved, mostly temperatures and species concentrations. Although data on flow velocities are commonly reported for low-energy density (subsonic flow) non-transferred arc torches (e.g., Singh et al, 2000), measurement of flow velocities in cutting torches have been reported only recently by our Group (Prevosto et al, 2009b). …”

Section: Thermal Plasmasmentioning

confidence: 96%

Numerical Modelling of a Cutting Arc Torch

Mancinelli¹,

Minotti²,

Prevosto³

et al. 2014

Computational and Numerical Simulations

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“…It was assumed R p = 150 μm and a plasma flow velocity of 100 m/s. 34 As it can be seen from Fig. 3, the space-charge layer is collisionless for electrons (λ e h) in the whole T e range, and also for ions (λ + h) if T e is higher than 8000 K; for T e lower than 11 000 K the ionization process in the adjacent plasma is not perturbed by the probe presence (L > d); for T e higher than about of 8000 K it results FIG.…”

Section: Double Floating Probe In High-pressure Highly Ionized mentioning

confidence: 99%

On the use of the double floating probe method to infer the difference between the electron and the heavy particles temperatures in an atmospheric pressure, vortex-stabilized nitrogen plasma jet

Prevosto

Kelly

Mancinelli

2014

Review of Scientific Instruments

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Sweeping double probe measurements in an atmospheric pressure direct current vortex-stabilized plasma jet are reported (plasma conditions: 100 A discharge current, N2 gas flow rate of 25 Nl/min, thoriated tungsten rod-type cathode, copper anode with 5 mm inner diameter). The interpretation of the double probe characteristic was based on a generalization of the standard double floating probe formulae for non-uniform plasmas coupled to a non-equilibrium plasma composition model. Perturbations caused by the current to the probe together with collisional and thermal processes inside the probe perturbed region were taken into account. Radial values of the average electron and heavy particle temperatures as well as the electron density were obtained. The calculation of the temperature values did not require any specific assumption about a temperature relationship between different particle species. An electron temperature of 10,900 ± 900 K, a heavy particle temperature of 9300 ± 900 K, and an electron density of about 3.5 × 10(22) m(-3) were found at the jet centre at 3.5 mm downstream from the torch exit. Large deviations from kinetic equilibrium were found toward the outer border of the plasma jet. These results showed good agreement with those previously reported by the authors by using a single probe technique. The calculations have shown that this method is particularly useful for studying spraying-type plasma torches operated at power levels of about 15 kW.

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Determination of plasma velocity from light fluctuations in a dc plasma torch

Cited by 10 publications

References 18 publications

Modelling of an argon plasma flow

Modelling of an argon plasma flow

Numerical Modelling of a Cutting Arc Torch

On the use of the double floating probe method to infer the difference between the electron and the heavy particles temperatures in an atmospheric pressure, vortex-stabilized nitrogen plasma jet

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