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Thin sample alloy solidification in electromagnetic driven convection

Thin sample alloy solidification in electromagnetic driven convection

Kao, A. ORCID: 0000-0002-6430-2134, Shevchenko, N., Roshchupinka, O., Eckert, S. and Pericleous, Koulis ORCID: 0000-0002-7426-9999 (2015) Thin sample alloy solidification in electromagnetic driven convection. In: 8th International Conference on Electromagnetic Processing of Materials. Groupe Élaboration par procédés magnétiques (Saint-Martin d'Hères, Isère). ISBN 9782955386101

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Abstract

During the directional solidification of Ga-In25%wt., density variations in the liquid cause plumes of solute to be ejected from the interface through natural convection. This can lead to the formation of chimneys during solidification and ultimately freckles. The application of external magnetic fields can be used to suppress these plumes. Two magnetic systems are considered. The first is a rotating magnetic wheel, which provides conditions analogous to forced convection at the solidification interface. The forced convection causes preferential growth of secondary branches and causes the plumes to be transported downstream and back into the bulk. The second is through the application of a static magnetic field that interacts with inherent thermoelectric currents, generating a Lorentz force that drives fluid flow within the inter-dendritic region. However, in the bulk where there are no thermoelectric currents, electromagnetic damping dominates and plumes are stunted. Using a fully coupled transient numerical model each of these systems has been analysed. Comparisons to experiments are given for the cases of natural and forced convection. The experimental setup uses a Hele-Shaw cell with an electric heater and Peltier cooler, allowing for control over the thermal gradient and cooling rate.

Item Type: Conference Proceedings
Title of Proceedings: 8th International Conference on Electromagnetic Processing of Materials
Additional Information: 8th International Conference on Electromagnetic Processing of Materials, 12-16 October 2015, Cannes, France.
Uncontrolled Keywords: Gallium Indium, Thin Sample Solidification, Natural convection, Forced convection, Thermoelectricmagnetohydrodynamics
Faculty / Department / Research Group: Faculty of Architecture, Computing & Humanities
Faculty of Architecture, Computing & Humanities > Centre for Numerical Modelling & Process Analysis (CNMPA) > Computational Science & Engineering Group (CSEG)
Faculty of Architecture, Computing & Humanities > Department of Mathematical Sciences
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Last Modified: 02 Mar 2019 15:53
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/14863

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