Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Three-dimensional modelling of radial segregation due to weak convection
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0003-2830-0454
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0003-3336-1462
2004 (English)In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 269, 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 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.
Keyword [en]
3D numerical simulation, Adaptive finite element, Automated code generation, Radial segregation, Floating zone technique, Microgravity conditions
National Category
Mechanical Engineering
Identifiers
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: diva2:320790
Note
QC 20100527Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Parallel computations on fusion welding and floating zones
Open this publication in new window or tab >>Parallel computations on fusion welding and floating zones
2003 (Swedish)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2003. vi, 16 p.
Series
Trita-MEK, ISSN 0348-467X ; 2003:16
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-1720 (URN)
Presentation
(English)
Note
QC 20100527Available from: 2004-06-21 Created: 2004-06-21 Last updated: 2010-05-27Bibliographically approved
2. Melt convection in welding and crystal growth
Open this publication in new window or tab >>Melt convection in welding and crystal growth
2004 (English)Doctoral thesis, comprehensive summary (Other scientific)
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.

Place, publisher, year, edition, pages
Stockholm: KTH, 2004. 36 p.
Series
Trita-MEK, ISSN 0348-467X ; 2004:15
Keyword
Engineering physics, thermocapillary convection, gas-tungsten arc welding, floating zone, parallel computing, finite element method, Teknisk fysik
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-83 (URN)
Public defence
2004-12-15, kollegiesalen, Valhallavägen 79, Stockholm, 10:15 (English)
Opponent
Supervisors
Note
QC 20100527Available from: 2004-12-15 Created: 2004-12-15 Last updated: 2010-05-27Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Authority records BETA

Do-Quang, MinhAmberg, Gustav

Search in DiVA

By author/editor
Do-Quang, MinhAmberg, Gustav
By organisation
Mechanics
In the same journal
Journal of Crystal Growth
Mechanical Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 65 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf