Impact of Aerosol on Transport Coefficients of Air Thermal Plasmas in Circuit Breakers

Yaguibou, Wêpari Charles; Nièssan, Kohio; Kagoné, Abdoul Karim; Koalaga, Zacharie

doi:10.5958/2319-6890.2018.00094.6

Cited by 2 publications

(3 citation statements)

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“…We use the minimization of Gibbs free energy to determine the composition versus the temperature at atmospheric pressure of the considered plasmas [8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Determination Of Chemical Compositionmentioning

confidence: 99%

“…Plasma is a mixture of air, water vapor and copper vapor; so we have plasmas of type NxOyHzCu t ; with x, y, z and t are fractional or integer values depending on the initial proportions of the mixture. We used Gibbs free energy minimization method to access the different numerical densities of chemical species in function of temperature [7][8][9][10][11][12][13]. These data are important for accessing the transport coefficients and the thermodynamic properties of these types of plasmas.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Metallic Copper Vapors on the Chemical Composition of a Mixture of Air and Water Vapor Thermal Plasmas in the Temperature Range 1000 K to 20000K

Nièssan¹,

Karim²,

Charles³

et al. 2020

NANO

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This paper concern the calculation of equilibrium composition of plasma mixture Air-Water vapor and copper vapor in temperatures range 1000K to 20000 K. The plasma is suposed to be in local thermodynamic equilibrium. We used Gibbs free energy minimization method to access the different numerical densities of chemical species as a function of temperature. This data are very important to calculate thermodynamic properties, transport coefficients and modeling electrical arc in circuit breakers. The result shows that the influence of metallic copper vapor is important on equilibrium composition of plasma. In particular the densities of electron in the plasma increase with the percentage of copper vapor for the temperature inferior to 17000K. The increasing of electron densities increase electrical conductivity of plasma and limit the performance of circuit breakers. Also the electrical neutrality is made mainly between electron (e-) and Cu + in low temperature (T < 12000K). We are studying in particular the evolution of the densities of the main chemical species created in this plasma as a function of pressure. We choose four values of pressure (1 atm, 5 atm, 10 atm and 15 atm). The results obtained shows an increasing of chemical densities with the pressure in the mixture in conformity at Dalton's Law. the increasing of the pressure in the plasma retard chemical reactions because it disadvantages the dislocations that constitute dissociation and ionization reactions in the plasma.

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Section: Determination Of Chemical Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Metallic Copper Vapors on the Chemical Composition of a Mixture of Air and Water Vapor Thermal Plasmas in the Temperature Range 1000 K to 20000K

Nièssan¹,

Karim²,

Charles³

et al. 2020

NANO

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“…Certain arc electric cutting techniques are based on the rapid elongation of the arc between the contacts and others, on a rolling of the arc between two insulating parts. Numerous theoretical [3,4,13,18,25,[27][28][29][30][31][32][33][34][35][36] and experimental [3,10] studies have already been carried out on polymers.…”

Section: Introductionmentioning

confidence: 99%

Transport Coefficients of Air - PMMA Mixtures Thermal Plasmas

Karim¹,

Nièssan²,

Charles³

et al. 2020

AJMSE

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The transport coefficients of Air-PMMA mixtures thermal plasmas is important to estimate the performances of cutting of the electrical arc in this gas by a circuit breaker. In this paper, Air-PMMA mixtures thermal plasmas dynamical viscosity, thermal and electrical conductivities coefficients are calculated in a temperature range from 5000K to 30000K. The calculations are made by supposing thermodynamic equilibrium at pressure of 1 bar to 10 bar. The results of the calculations show the influence of the initial proportion of PMMA but also that of the pressure on the mixture plasma transport coefficients. As the efficiency of the breaking of the electric current by the circuit breaker depends closely on the thermal and electrical characteristics of the extinguishing medium, this extinguishing medium should have a high thermal conductivity and an electrical conductivity varying rapidly with temperature. The plasma of the mixture constituted by 80% of air and 20% of PMMA presents at first sight best characteristics for the breaking of electric current. It has the highest thermal conductivity peak among the plasmas of the mixtures studied.

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Impact of Aerosol on Transport Coefficients of Air Thermal Plasmas in Circuit Breakers

Cited by 2 publications

References 0 publications

Influence of Metallic Copper Vapors on the Chemical Composition of a Mixture of Air and Water Vapor Thermal Plasmas in the Temperature Range 1000 K to 20000K

Influence of Metallic Copper Vapors on the Chemical Composition of a Mixture of Air and Water Vapor Thermal Plasmas in the Temperature Range 1000 K to 20000K

Transport Coefficients of Air - PMMA Mixtures Thermal Plasmas

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