A simplified model for the determination of current-voltage characteristics of a high pressure hydrogen plasma arc

Gueye, Papa; Cressault, Yann; Rohani, Vandad-Julien; Fulcheri, Laurent

doi:10.1063/1.4976572

Cited by 15 publications

(12 citation statements)

References 19 publications

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“…This clearly demonstrates the dominant effect of absorption over radiation at high filling pressures. A similar dominance of absorption coefficient over net radiation emission coefficient at elevated pressures has also been reported for hydrogen arcs burning at 20 bar gas pressure [26]. Likewise, a significant reduction of ablation in metal by a laser due to increased pressure of the surrounding gases has been reported in the literature [27].…”

Section: B Tube-constricted Arcsupporting

confidence: 66%

Ultrahigh-Pressure Nitrogen Arcs Burning Inside Cylindrical Tubes

Abid

Niayesh

Støa-Aanensen

2019

IEEE Trans. Plasma Sci.

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When the pressure and temperature of a fluid exceed a critical point, the fluid enters into the supercritical region. In this region, the physical properties are believed to be in favor of a good current interruption medium. This study focuses on the arc voltage characteristics of nitrogen arcs burning inside cylindrical tubes at different filling pressures: 1 bar, 20 bar, 40 bar, and 80 bar, thus covering the supercritical region. Two different tube materials have been used in the experiments; alumina and PTFE. Arc voltages are measured for arcs burning inside tubes of 2, 4, 8, and 15 mm inner diameters. In addition, free-burning arcs have been investigated at the same filling pressures. The arc current was 150 A at 350 Hz throughout the study. The arc voltage is found to increase with decreasing inner diameter of the tube at atmospheric pressure. At higher filling pressures (i.e., 20 bar, 40 bar, 80 bar), however, such a simple relationship is not observed. The arc temperature and radius have been calculated based on the 'simple theory of free-burning arcs' and the 'two-zone ablation arc model'. The calculated arc radius decreases with increasing gas pressure. Furthermore, due to increased absorption of radiation at high filling pressures, ablation is found less significant for ultrahigh-pressure nitrogen arcs compared to atmospheric pressure arcs. This is in line with the observations from optical micrographs of the inner surfaces of the tubes exposed to arcs at different filling pressures.

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Section: B Tube-constricted Arcsupporting

confidence: 66%

Ultrahigh-Pressure Nitrogen Arcs Burning Inside Cylindrical Tubes

Abid

Niayesh

Støa-Aanensen

2019

IEEE Trans. Plasma Sci.

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“…NEC kasuaren barruan 4 kasu desberdindu dira erradiazioa kalkulatzeko erabiltzen diren esfera isotermoen erradioaren menpe: 0 mmkoa, 1 mmkoa, 5 mmkoa eta 10 mmkoa (6. Irudian) [13].…”

Section: Hidrogeno Eredua Eta Emaitzakunclassified

Arku Elektrikoaren FVM Bidezko Simulazioa Ibilgailu Elektrikoen Baterietako Hidrogenozko Etengailuetan

Martín

Iturregi

Eguía

et al. 2023

EKAIA

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Arku elektrikoa etengailuetan ematen den efektua da. Etengailuaren kontaktuak bata bestetik aldentzen direnean, etengailutik pasatzen den korronte elektrikoa kontaktuetatik etengailuaren gas isolatzailera pasatzen da, eta hau ionizatuz, bertan arku elektrikoa sortzen da. Arku elektrikoak efektu ez desiragarriak sor ditzake etengailuetan, beraz, efektu horiek murrizteko asmoz, lan honen helburu nagusia hidrogenoaren baliagarritasuna aztertzea da etengailuaren gas isolatzaile modura. Horretarako, Navier-Stokesen ekuazioak eta Bolumen Finituen Metodoa (FVM) oinarritzat hartuz, simulazio Magnetohidrodinamikoak (MHD) definitu dira ANSYS CFX programaren bitartez. Hala, arku elektrikoaren prozesuan oinarrizkoak diren aldagaiak kalkulatu dira, hala nola, tentsioa, tenperatura eta presioa. Emaitza horiek airea isolatzaile modura darabilten etengailuetan lortutakoekin alderatuz, hidrogenoa simulatutako aplikaziorako gas egokia den ala ez ondorioztatuko da.

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“…[ 12,13 ] More recently, scientists have used iterative methods to calculate the temperatures profiles of electric arcs by solving Ohm's law and the full radiative Elenbaas–Heller equation for arcs of predetermined geometries and wall temperatures. [ 14 ] In all the previous cases, finding a solution to the problem was possible because the geometry of the electric arc was known: the length of the arc was the distance between the electrodes (fixed) and the radius of the arc was measured from experimental observations.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The physical and electrical phenomena of a wall stabilized DC plasma column in LTE with negligible Lorentz forces are governed by the Elenbaas–Heller energy Equation (5) and Ohm's law (Equation (6)). [ 8,14,21 ]

\nabla \cdot (- κ \nabla T) + \nabla \cdot {\overset{q}{true}}_{rad} = \overset{false\to}{j} \cdot \overset{false\to}{E}

\overset{false\to}{j} = σ (T) \cdot \overset{false\to}{E}

…”

Section: The Electric Arc Modelmentioning

confidence: 99%

Numerical Estimation of the Geometry and Temperature of An Alternating Current Steelmaking Electric Arc

Hernández

Onofri

Engell

2020

steel research int.

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A channel arc model (CAM) that predicts the temperature and the geometry of an electric arc from its voltage and impedance set‐points is presented. The core of the model is a nonlinear programming (NLP) formulation that minimizes the entropy production of a plasma column, the physical and electrical properties of which satisfy the Elenbaas–Heller equation and Ohm's law. The radiative properties of the plasma are approximated utilizing the net emission coefficient (NEC), and the NLP is solved using a global numerical solver. The effects of the voltage and impedance set‐points on the length of the electric arc are studied, and a linear formula that estimates the length of the arc in terms of its electrical set‐points is deducted. The length of various electric arcs is measured in a fully operative electric arc furnace (EAF), and the results are used to validate the proposed models. The errors in the predictions of the models are 0.5 and 0.4 cm. In comparison, the existing empirical and Bowman formulae estimate the length of the experimental arcs with errors of 2.1 and 2.6 cm. A simplified formula to estimate the temperature of an electric arc in terms of its electrical set‐points is also presented.

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A simplified model for the determination of current-voltage characteristics of a high pressure hydrogen plasma arc

Cited by 15 publications

References 19 publications

Ultrahigh-Pressure Nitrogen Arcs Burning Inside Cylindrical Tubes

Ultrahigh-Pressure Nitrogen Arcs Burning Inside Cylindrical Tubes

Arku Elektrikoaren FVM Bidezko Simulazioa Ibilgailu Elektrikoen Baterietako Hidrogenozko Etengailuetan

Numerical Estimation of the Geometry and Temperature of An Alternating Current Steelmaking Electric Arc

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