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Modeling the fluid dynamics and dendritic solidification in EM-levitated alloy melts

Modeling the fluid dynamics and dendritic solidification in EM-levitated alloy melts

Bojarevics, Valdis, Kao, Andrew and Pericleous, Koulis ORCID: 0000-0002-7426-9999 (2012) Modeling the fluid dynamics and dendritic solidification in EM-levitated alloy melts. In: Herlach, Dieter M. and Matson, Douglas M., (eds.) Solidification of Containerless Undercooled Melts. Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany, pp. 321-348. ISBN 9783527331222 (doi:10.1002/9783527647903.ch15)

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Abstract

Containerless melting and solidification requires a sample that is in some way suspended, or levitated against gravity, away from contact with any containing walls. There are several ways of achieving this goal, as given in earlier chapters. In the case of electromagnetic levitation, the lifting/confining force is commonly provided using a medium/high-frequency AC current positioning coil. An opposing eddy current develops within the sample, which in this case needs to be electrically conducting; the interaction of the coil and induced currents leads to the repelling Lorentz force. Other interactions follow as a consequence: assuming that the sample is an alloy melt, the Lorentz force also drives convection within it and the induced current generates resistive heat in a sample of finite conductivity. These two effects have a bearing on how solidification proceeds and therefore it is important that they are accurately represented in any mathematical model of the process.

Item Type: Book Section
Additional Information: [1] First published online: 23 August 2012. [2] First published in print: 18 July 2012. [3] Chapter 15. Published as: Bojarevics, Valdis, Kao, Andrew and Pericleous, Koulis (2012) Modeling the fluid dynamics and dendritic solidification in EM-levitated alloy melts. In: Solidification of Containerless Undercooled Melts. Wiley-VCH Verlag & Co., Weinheim, Germany, pp. 321-348. [4] ISBN: 978-3-527-33122-2 (hbk) published July 2012; 978-3-527-64792-7 (ebk), published August 2012.
Uncontrolled Keywords: electromagnetic levitation, high magnetic field, Marangoni flow, Gibbs–Thompson condition, Seebeck power, undercooling, oscillating droplet hydrodynamics
Subjects: Q Science > QA Mathematics
T Technology > T Technology (General)
Pre-2014 Departments: School of Computing & Mathematical Sciences
Related URLs:
Last Modified: 14 Oct 2016 09:21
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/8638

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