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Three-dimensional modelling of radial segregation due to weak convection
KTH, Tidigare Institutioner, Mekanik.ORCID-id: 0000-0003-2830-0454
KTH, Tidigare Institutioner, Mekanik.ORCID-id: 0000-0003-3336-1462
2004 (engelsk)Inngår i: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 269, s. 454-463Artikkel i tidsskrift (Fagfellevurdert) 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 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.

sted, utgiver, år, opplag, sider
2004. Vol. 269, s. 454-463
Emneord [en]
3D numerical simulation, Adaptive finite element, Automated code generation, Radial segregation, Floating zone technique, Microgravity conditions
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-13094DOI: 10.1016/j.jcrysgro.2004.05.076ISI: 000223813300039Scopus ID: 2-s2.0-4344633801OAI: oai:DiVA.org:kth-13094DiVA, id: diva2:320790
Merknad
QC 20100527Tilgjengelig fra: 2010-05-27 Laget: 2010-05-27 Sist oppdatert: 2017-12-12bibliografisk kontrollert
Inngår i avhandling
1. Parallel computations on fusion welding and floating zones
Åpne denne publikasjonen i ny fane eller vindu >>Parallel computations on fusion welding and floating zones
2003 (svensk)Licentiatavhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Stockholm: KTH, 2003. s. vi, 16
Serie
Trita-MEK, ISSN 0348-467X ; 2003:16
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-1720 (URN)
Presentation
(engelsk)
Merknad
QC 20100527Tilgjengelig fra: 2004-06-21 Laget: 2004-06-21 Sist oppdatert: 2010-05-27bibliografisk kontrollert
2. Melt convection in welding and crystal growth
Åpne denne publikasjonen i ny fane eller vindu >>Melt convection in welding and crystal growth
2004 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

A parallel finite element code with adaptive meshing was developed and used to study three dimensional, time-dependent fluid flows caused by thermocapillary convection as well as temperature and dopant distribution in fusion welding and floating zone crystal growth.

A comprehensive numerical model of the three dimensional time-dependent fluid flows in a weld pool had been developed. This model considered most of the physical mechanisms involved in gas tungsten arc welding. The model helped obtaining the actual chaotic time-dependent melt flow. It was found that the fluid flow in the weld pool was highly complex and influenced the weld pool’s depth and width. The physicochemical model had also been studied and applied numerically in order to simulate the surfactant adsorption onto the surface effect to the surface tension of the metal liquid in a weld pool.

Another model, a three dimensional time-dependent, with adaptive mesh refinement and coarsening was applied for simulating the effect of weak flow on the radial segregation in floating zone crystal growth. The phase change equation was also included in this model in order to simulate the real interface shape of floating zone.

In the new parallel code, a scheme that keeps the level of node and face instead of the complete history of refinements was utilized to facilitate derefinement. The information was now local and the exchange of information between each and every processor during the derefinement process was minimized. This scheme helped to improve the efficiency of the parallel adaptive solver.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2004. s. 36
Serie
Trita-MEK, ISSN 0348-467X ; 2004:15
Emneord
Engineering physics, thermocapillary convection, gas-tungsten arc welding, floating zone, parallel computing, finite element method, Teknisk fysik
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-83 (URN)
Disputas
2004-12-15, kollegiesalen, Valhallavägen 79, Stockholm, 10:15 (engelsk)
Opponent
Veileder
Merknad
QC 20100527Tilgjengelig fra: 2004-12-15 Laget: 2004-12-15 Sist oppdatert: 2010-05-27bibliografisk kontrollert

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