Melting of A Wire Anode Followed by Solidification : A Three Phase Moving Interface Problem  

Oleh:

Cohen, Ira W. ; Ayyaswamy, P. S. ; Sripada, S. S.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 125 no. 4 (Aug. 2003), page 661-668.
Topik: melting; melting; wire anode; solidification; three phase moving; interface

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.7 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

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.

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