Temperature Diagnostics in Turbulent Arcs

Time averaged radial distributions of temperature and its fluctuations have been obtained for turbulent (and laminar) dc-argon arcs operated at 65 A in a 1-cm diam channel. With laminar arcs fluctuations proceeded inward from the outer edge; in the present case temperature fluctuations were about 1 percent and 4 percent at the centerline and outer edge, respectively. Relatively large fluctuations in temperature, about 5 percent, were found across the entire column where the arc was turbulent. Centerline temperatures were nearly identical for both laminar and turbulent arcs-about 10 610 K. The analytical development is an extension of the model of Schreiber and Hunter.