Abstract
Fluctuation phenomena of plasma jet flow in an innovative long DC arc system with a ring-shaped anode were successfully clarified by a high-speed camera visualization. The long DC arc with long electrode gap distance more than 350 mm has been applied to gas decomposition due to its advantages of long plasma length, resulting in long residence time of treated gas. However, large heat loss at a conventional hemispherical-shaped anode was a critical issue in the long DC arc system. Therefore, the ring-shaped anode was utilized to convert large energy loss at the anode into the plasma jet flow. High-speed camera observation revealed the effect of external magnetic field on the fluctuation phenomena. Plasma jet fluctuates with the frequency of several tens Hz when the magnetic field was applied. These understanding of arc and plasma jet fluctuation enables to improve the capability of long DC arc system.
Highlights
Thermal plasmas have been received a great attention in applications to waste treatment
The effect of the coil current on arc fluctuation is presented
Obtained snapshots shows that the long DC arc column was destabilized under the conditions with the external magnetic field
Summary
Thermal plasmas have been received a great attention in applications to waste treatment. This is due to their unique advantages in the waste decomposition such as high temperature and abundant radicals, which promote the decomposition and conversion of waste into environmentally benign materials in a compact system (Heberlein and Murphy, 2008). A long DC arc is one of most attractive thermal plasma sources. The long DC arc can be generated between a cathode rod and a hemi-spherical anode with a longer gap distance than 300 mm. This is one order longer than conventional DC arcs. Effect of external magnetic field on the arc fluctuation have been clarified
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