Thermoelectric effects on alloy solidification microstructure

A. Kao, K. A. Pericleous, M. K. Patel, Vaughan R Voller

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Thermoelectric currents in the presence of a magnetic field generate Lorentz forces which can drive fluid flow. In the case of dendritic growth a naturally occurring thermoelectric current exists and in the presence of a high magnetic field micro convections are generated. Experimental evidence has attributed changes in microstructure to this effect. A numerical model has been developed to study the flow field around an unconstricted equiaxed dendrite growing under these conditions. The growth is modeled in 2D and 3D by an enthalpy based method and a complex flow structure has been predicted. Using a pseudo-3D approximation for economy, realistic 2D simulations are obtained where a fully coupled transient scheme reveals significant changes to the dendrite morphology reflecting experimental evidence. There is a rotation of the preferred direction of growth and increased secondary branching.

Original languageEnglish (US)
Title of host publicationProceedings from the 12th International Conference on Modeling of Casting, Welding, and Advanced Solidification Processes
Pages521-528
Number of pages8
StatePublished - Dec 1 2009
Event12th International Conference on Modeling of Casting, Welding, and Advanced Solidification Processes - Vancouver, BC, Canada
Duration: Jun 7 2009Jun 14 2009

Other

Other12th International Conference on Modeling of Casting, Welding, and Advanced Solidification Processes
Country/TerritoryCanada
CityVancouver, BC
Period6/7/096/14/09

Keywords

  • Dendritic-growth
  • Enthalpy
  • MHD
  • Thermoelectricity
  • Undercooling

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