A fine metallic wire electrode is heated from below (by an electric discharge) causing melting and roll-up into a ball by surface tension. After the heating is terminated, a solidification front progresses through the melt until a solid ball is formed and cooled to ambient conditions. In this paper we numerically simulate the heating, melt motion and roll up and subsequent cooling and solidification. This is a three-phase problem (solid, liquid, and the ambient medium—plasma/gas) with two simultaneously moving phase interfaces, the outer one tracked by orthogonal grid generation conformal with the evolving boundary surface at each time interval. A novel observation in this study is that the wire end first drops until the melt radius equals the wire radius and then it begins to roll up into a ball consuming the wire. In other words, the inter-electrode gap first reduces and subsequently increases during an electronic flame off (EFO) discharge heating/phase-change process.
Melting of a Wire Anode Followed by Solidification: A Three-Phase Moving Interface Problem
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division May 22, 2002; revision received February 25, 2003. Associate Editor: V. P. Carey.
- Views Icon Views
- Share Icon Share
- Cite Icon Cite
- Search Site
Sripada , S. S., Cohen , I. M., and Ayyaswamy, P. S. (July 17, 2003). "Melting of a Wire Anode Followed by Solidification: A Three-Phase Moving Interface Problem ." ASME. J. Heat Transfer. August 2003; 125(4): 661–668. https://doi.org/10.1115/1.1576811
Download citation file:
- Ris (Zotero)
- Reference Manager