Messung und Deutung des Leitwertabklingens zylindrischer Bögen

Hertz, W.

doi:10.1007/bf01402333

Cited by 18 publications

(11 citation statements)

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“…In addition, the studies undertaken by various authors Hertz [36], Vacquié [37] showed that thermal conductivity has a very significant role on the time-constant of arc τ. Consequently the shape of the thermal conductivity curve gives information on the performance of gas used for the electric arcs. The importance of thermal conductivity particularly appears through its reactional component λ R .…”

Section: Results and Analysesmentioning

confidence: 99%

Calculation of air-water vapor mixtures thermal plasmas transport coefficients

Kagoné

Koalaga

Zougmoré

2012

IOP Conf. Ser.: Mater. Sci. Eng.

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Knowledge of transport coefficients of air-water vapor mixtures thermal plasmas is important to estimate the performances of electrical arc cutting in this gas by a circuit breaker. In this paper, air-water vapor mixtures thermal plasmas dynamical viscosity, thermal and electrical conductivities coefficients are calculated in a temperature range from 5000K to 30000K. The calculations are carried out by supposing local thermodynamic equilibrium at pressure of 1.0 atm, 5.0 atm and 10 atm. The calculation results show the influence of the water vapor initial proportion but also that of the plasmas pressure on these transport coefficients. The plasma of the mixture constituted by 20% of air and 80% of water vapor presents at first sight good characteristics for the electric current cut. It has the highest thermal conductivity and the lowest electrical conductivity among plasmas of studied mixtures.

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Section: Results and Analysesmentioning

confidence: 99%

Calculation of air-water vapor mixtures thermal plasmas transport coefficients

Kagoné

Koalaga

Zougmoré

2012

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The solutions are compared with those obtained from experiments (Hertz 1971, Ernst et a1 1973, Lowke and Mitchell 1983 and previous finite difference calculations (LoWke et a1 1973, Lowke andMitchell 1983).…”

Section: Introductionmentioning

confidence: 94%

“…Measurements of the conductance of an arc decaying from an initial current of 100 A in nitrogen were made by Hertz (1971). Detailed numerical calculations by Lowke el (1973) using a finite difference method followed.…”

Section: Time-dependent Free Decaying Arcmentioning

confidence: 99%

Piezoelectric Microactuators for Use in Magnetic Disk Drives

Kurihara

Hida

Umemiya

et al. 2004

Jpn. J. Appl. Phys.

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The orthogonal collocation method is applied to the study ofwall-stabilised plasma arcs. The numerical implementation of this method is simpler a.nd faster than that of finite difference methods of comparable accuracy. The solutions obtained agree with experiments and with previous finite difference calculations.For the steady-state DC case, radial temperature results are obtained for arcs in nitrogen and sulphur hexafluoride a? atmospheric pressure. It is shown that the inclusion of radiative self-absorption in sulphur hexafluoride arcs leads to a reduction in the centre temperature. a broadening of the temperature distributions and a smail decrease in the axial electric field.Solutions are obtained also for the time-dependent behaviour of a nitrogen arc following an abrilpi current interruption. In this transient case. self-induced radial flow is considered, leading to the additional process of convective loss.

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“…Ceci entraîne une diminution du temps d'extinction de l'arc. Hertz [7] a montré l'importance qu'occupe le transfert d'énergie de réaction dans la vitesse d'extinction de l'arc. Il a établi une relation liant la constante de temps de l'arc à la valeur maximale de la conductivité thermique de réaction (t = C t e 0 3 B B m a x R ) .…”

Section: Résultats Et Analyseunclassified

Etude expérimentale d'une décharge d'arc électrique contaminée par des vapeurs d'isolants

Cheminat¹,

Andanson²

1986

Rev. Phys. Appl. (Paris)

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Messung und Deutung des Leitwertabklingens zylindrischer Bögen

Cited by 18 publications

References 0 publications

Calculation of air-water vapor mixtures thermal plasmas transport coefficients

Calculation of air-water vapor mixtures thermal plasmas transport coefficients

Piezoelectric Microactuators for Use in Magnetic Disk Drives

Etude expérimentale d'une décharge d'arc électrique contaminée par des vapeurs d'isolants

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