Magnetic Field Effect on the Volt‐Equivalent of Arc Spot Heat Flux

Abstract

The results of an experimental study of the arc spot heat flux on the copper cathode of a coaxial Electric Arc Heaters (EAH), with magnetically driven arc, in air are presented. The three rings method was used for indirect separation of arc spot heat flux from total heat entering the electrode. As a result of joint generalizing new and previously published data, the linear dependence of the volt equivalent of arc spot heat flux on magnetic field was obtained for the range B = 0.01 − 1 Tesla and atmospheric pressure. A method, which allows to improve the measurement of the volt equivalent in highly unsteady arc spots, is proposed.

Determination of the Power Balance for Thin Ag–SnO₂ Electrodes Submitted to an Electric Arc Based on IR Thermography

“…On this subject, in the case of copper electrodes, some authors have proposed an estimate of V eq as a function of I arc . It was observed [54] that the mean value of V eq seemed to depend little on I arc in the range 150 A -500 A and that a very strong dispersion in the results appeared (for I arc = 280 A V eq is in the range 4 -11 V). It is then possible to have V eq of the order of 9V for 125 A, 5V for 280 A and 8 for 500 A.…”