Experimental observation and numerical analysis of arc plasmas diffused by magnetism |
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Authors: | L C Li W D Xia H L Zhou Z P Zhou B Bai |
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Institution: | (1) Department of Thermal Science & Energy Engineering, University of Science & Technology of China, Hefei, 230027, P.R. China |
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Abstract: | At atmospheric pressure, an intensified charge-coupled device (ICCD) camera
with a narrow-band filter is used to capture the unsaturated images of a
magnetically rotating arc. Comparison of its configurations with different
arc current and external axial magnetic field (AMF) strength shows that the
strong electromagnetic force may impel the arc to diffuse. Under the fully
diffuse mode, the plasma is distributed throughout the electrode gap and no
anode attachment can be seen in the cross-section of the torch. The fully
diffuse plasma runs more steadily and its intensity distribution is more
uniform, while its voltage fluctuation is reduced significantly.
Using a commercial CFD (computational fluid dynamics) code FLUENT, the fluid
flow and heat transfer of the fully diffuse plasma in an assumed magnetron
torch have been simulated for qualitatively discussing the AMF effects.
Numerical results show that the AMF significantly impels the plasma to
retract axially and expand radially. As a result, the plasma intensity
distribution on the cross section of the torch gets to be more uniform. |
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Keywords: | 52 50 Dg Plasma sources 52 77 Fv High-pressure high-current plasmas 52 65 Kj Magnetohydrodynamic and fluid equation |
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