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Cold crucible melting with bottom pouring nozzle

Valdis Bojarevics (Department of Mathematical Sciences, University of Greenwich, Old Royal Naval College, UK)
Koulis Pericleous (Department of Mathematical Sciences, University of Greenwich, Old Royal Naval College, UK)

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering

ISSN: 0332-1649

Article publication date: 7 January 2020

Issue publication date: 11 March 2020

Abstract

Purpose

The purpose of this paper is to investigate a new type of nozzle which is free from erosion and non-contaminating the outflow metal. Cold crucible melting technique with electromagnetic induction is used to obtain reactive metal castings and produce high-quality metal powders for aerospace, automotive and medical applications. An important part of this technology is the nozzle used to pour the molten alloy through the bottom opening.

Design/methodology/approach

The paper uses mathematical modeling technique, previously validated on multiple similar cases, to investigate a new type of nonconsumable nozzle made of copper segments.

Findings

The design of the nozzle requires to satisfy the narrow balance between the thin solidified protective layer on the wall while avoiding the blockage of the outflow if the nozzle is frozen completely. The sensitivity of the outflow to the nozzle diameter is investigated. The AC electromagnetic force leads to high mixing rates, transitional flow structures and turbulence of the melt, contributing to the melt shape dynamics and the heat loss to walls.

Originality/value

The beneficial features of the cold crucible melting to purify the melt from particulate contamination are explained using the full melting and pouring cycle.

Keywords

Citation

Bojarevics, V. and Pericleous, K. (2020), "Cold crucible melting with bottom pouring nozzle", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 39 No. 1, pp. 36-42. https://doi.org/10.1108/COMPEL-05-2019-0208

Publisher

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Emerald Publishing Limited

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