Three-dimensional modelling of radial segregation due to weak convection
2004 (English)In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 269, 454-463 p.Article in journal (Refereed) Published
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 Marangoni 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 keff and for the radial segregation [Delta]c’. The radial dopant segregation is affected by weak convection.
Place, publisher, year, edition, pages
2004. Vol. 269, 454-463 p.
3D numerical simulation, Adaptive finite element, Automated code generation, Radial segregation, Floating zone technique, Microgravity conditions
IdentifiersURN: urn:nbn:se:kth:diva-13094DOI: 10.1016/j.jcrysgro.2004.05.076ISI: 000223813300039ScopusID: 2-s2.0-4344633801OAI: oai:DiVA.org:kth-13094DiVA: diva2:320790
QC 201005272010-05-272010-05-272011-11-10Bibliographically approved