Abstract
The vapour flow pattern of a free-burning arc of 20 mm length is studied varying the cathode and anode diameters independently from 5 to 22 mm. Roughly speaking, there are two flow patterns which depend on the electrode arrangement. One is a bidirectional flow pattern and the other a unidirectional flow pattern. In both cases, outward flow are always observed without any indication of the air entrainment. A rough estimation shows that the radiation loss is more than 84% of the total energy loss in the vapour dominant arc generated in the present condition.
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