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Effects of magnetic fields on crystal growth

Effects of magnetic fields on crystal growth

Kao, A., Pericleous, K., Patel, M.K. and Voller, V. (2009) Effects of magnetic fields on crystal growth. International Journal of Cast Metals Research, 22 (1-4). pp. 147-150. ISSN 1364-0461 (Print), 1743-1336 (Online) (doi:10.1179/136404609X367551)

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Abstract

The effects of a constant uniform magnetic field on thermoelectric currents during dendritic solidification were investigated using a two-dimensional enthalpy based numerical model. Using an approximation for three-dimensional unconstricted growth, the resulting Lorentz forces generate a circulating flow influencing the solidification pattern. Under the presence of a strong magnetic field secondary growth on the clockwise side of the primary arm of the dendrite was encouraged, whereas the anticlockwise side is suppressed due to a reduction in local free energy. The preferred direction of growth rotated in the clockwise sense under an anticlockwise flow. The tip velocity is significantly increased compared with growth in stagnant flow. This is due to a small recirculation at the tip of the dendrite; bringing in colder liquid and lowering the concentration of solute.

Item Type: Article
Additional Information: [1] Published in print: 1 August 2009. [2] Published as: International Journal of Cast Metals Research, (2009), Vol. 22, (1-4), pp. 147-150. [3] This paper was presented on 20th June 2008 at the 2nd International Conference on Advances in Solidification Processes ICASP-2, held from 17–20 June 2008 in Graz, Austria. It forms part of a collection of papers selected for subsequent publication in the International Journal of Cast Metals Research, Volume 22, Numbers 1-4, August 2009.
Uncontrolled Keywords: dendritic growth, magnetohydrodynamics, thermoelectricity, enthalpy, undercooling, binary alloy
Subjects: T Technology > TS Manufactures
Q Science > QA Mathematics
Pre-2014 Departments: School of Computing & Mathematical Sciences
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Mechanics & Reliability Group
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Science & Engineering Group
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Fire Safety Engineering Group
School of Computing & Mathematical Sciences > Department of Computer Systems Technology
Related URLs:
Last Modified: 14 Oct 2016 09:04
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/1512

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