Experimental Total and Total Line Radiation of Nitrogen, Oxygen, and Argon Plasmas

Krey, R. U.; Morris, J.

doi:10.1063/1.1693106

Cited by 34 publications

(14 citation statements)

References 12 publications

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“…Other coefficients of the problem like C A p , C G p , k A , k G and σ were obtained from Ref. [9] for the temperature range 300 − 45000 K. Radiative losses from the arc were included by considering that the total radiation field is composed by ∼ 50% of continuous radiation and another 50% of line radiation [10,11]. The surrounding gas is considered to be transparent to continuous radiation but opaque to line radiation.…”

Section: ∂ ∂Zmentioning

confidence: 99%

Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle

Kelly¹,

Minotti²,

Prevosto³

et al. 2004

Braz. J. Phys.

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We present a simple hydrodynamic model to obtain the profiles of the relevant physical quantities along a nozzle of arbitrary cross-section in a cutting torch. The model uses a two-zone approximation (a hot central plasma carrying the discharge current wrapped by a relatively cold gas which thermally isolates the nozzle wall from the plasma). Seeking for a solution with sonic conditions at the nozzle exit, the model allows expressing all the profiles in terms of the externally controlled parameters of the torch (geometry of the torch, discharge current, mass flow of the gas and plenum pressure) and the values of the arc and gas temperatures at the nozzle entrance. These last two values can be estimated simply appealing to energy conservation in the cathode-nozzle region. The model contains additional features compared with previous reported models, while retaining simplicity. The detailed consideration of an arc region coupled to the surrounding gas dynamics allows determining voltage drops and consequent delivered power with less assumptions than those found in other published works, and at the same time reduces the set of parameters needed to determine the solution.

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Section: ∂ ∂Zmentioning

confidence: 99%

Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle

Kelly¹,

Minotti²,

Prevosto³

et al. 2004

Braz. J. Phys.

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show abstract

“…More interesting might be the fact that the volume of the nitrogen plasma column measured in this study was approximately half the size of the argon plasma (measured by Choi, 198 1 ), under similar operating conditions. Krey and Morris (1970) measured the total radiative power per unit volume for nitrogen and argon, and found that in the temperature range 12000 to 13 000 K, the radiation intensity of argon is higher than the corresponding intensity of nitrogen. The smaller volume of the nitrogen plasma coupled with its lower total radiation intensity can be of great economic importance, since it implies that, for a given temperature within the previously specified temperature range, the nitrogen plasma can transfer more power and at a higher efficiency to the anode of a transferred arc system than an argon plasma.…”

Section: Results and Discussion Section I -Solid Anodementioning

confidence: 99%

Operating characteristics and energy distribution in a nitrogen transferred arc plasma

Tsantrizos¹,

Gauvin²

1982

Can J Chem Eng

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The electrical characteristics of a nitrogen transferred arc plasma were measured in a closed chamber, which simulated a plasma furnace. The total arc voltage depended strongly on the arc length and much less on current and plasma gas volumetric flow rate, with a voltage gradient of about 12 V/cm. The various mechanisms accounting for the transfer of the energy in the arc to the system were identified and measured. The two major components of the energy distribution were by electron transfer to the anode (whether water‐cooled solid copper or molten metal) and by radiation from the plasma column. The significance of these measurements for the design and optimization of plasma furnaces is discussed.

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“…In order to dissipate the large heat flux into the wall, the arc vessel is usually constructed of water cooled copper rings, separated by insulators (Maecker (1956), Maecker (I960)). The wall stabilized arc has been used extensively for spectroscopic studies (Olsen (1963), Krey and Morris (1970), Bacri et al (1972)) and measurements of the transport properties of gases in the temperature range 7000 K to 20000 K (Emmons andLand (1962), Emmons (1967), Bues et al (1967), Bauder and Maecker (1971), Kopainsky (1971)). In the 1960's it was also studied extensively with a view to its application as a gas heater to produce high enthalpy gas flows for aerospace research (Stine and Watson (1964), Watson and Pegot (1967)).…”

Section: Introductionmentioning

confidence: 99%