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Temperature Distribution Dependence on Refractory Anode Thickness in a Vacuum Arc: Theory

Temperature Distribution Dependence on Refractory Anode Thickness in a Vacuum Arc: Theory,10.1109/TPS.2011.2118768,IEEE Transactions on Plasma Science

Temperature Distribution Dependence on Refractory Anode Thickness in a Vacuum Arc: Theory   (Citations: 1)
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Anode heating by plasma heat flux in a vacuum arc was modeled. The model included the nonlinear 2-D heat conduc- tion equation with temperature-dependent thermophysical ma- terial properties and heat losses by Stefan-Boltzmann radiation from the anode surfaces. The heat conduction equation was solved numerically for 32-mm-diameter tungsten cylindrical anodes with different anode thicknesses and arc currents. The time-dependent heat flux to the tungsten anode was determined using measured anode temperatures. The time-dependent effective anode voltage Uef was found to decrease from an initial to a steady-state value, e.g., from 11.4 to 7.05 V, for 175 A, anode thickness d =3 0mm, and electrode gap h =1 0mm. It was shown that Uef increases with d at t =0 and in the transient period, while at steady state, Uef slightly decreases with d and h.
Journal: IEEE Transactions on Plasma Science - IEEE TRANS PLASMA SCI , vol. 39, no. 6, pp. 1307-1310, 2011
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