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Three-dimensional Modeling of Radial Segregation due to Weak Convection
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.ORCID iD: 0000-0002-3622-4247
2004 (English)In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 269, no 2-4, 454-463 p.Article in journal (Refereed) Published
Abstract [en]

A comprehensive three-dimensional, time-dependent model of heat, momentum and solute transfer during solidification is carried out to illustrate the influence of weak convection, caused by surface tension forces, on radial dopant segregation occurring in crystal growth under micro-gravity conditions. 3D adaptive finite element method is used in order to simulate the motion and deformation of the solidification interface. The geometry studied is a Bridgman configuration with a partly coated surface. The small slots in the coating gives a free surface in a controlled way, and is varied in order to alter the Marangom flow. in this study, A comparison is made between the numerical results and the experimental results. A good agreement has been observed for the effective distribution coefficient k(eff) and for the radial segregation Deltac'. The radial dopant segregation is affected by weak convection.

 

Place, publisher, year, edition, pages
2004. Vol. 269, no 2-4, 454-463 p.
Keyword [en]
Microgravity, Radial segregation, Adaptive FEM, 3D numerical simulation
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:miun:diva-1542ISI: 000223813300039Local ID: 444OAI: oai:DiVA.org:miun-1542DiVA: diva2:26574
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2011-04-08Bibliographically approved

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Carlberg, Torbjörn
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