Eulerian equilibrium and non-equlibrium macroscopic modelling of binary system solidification

• Autorzy: Banaszek J. , Furmański P. , Browne D.
• Języki publikacji: EN

Abstrakty

EN

Two models of macroscopic computer simulation of binary system solidification on a fixed grid are discussed. First, it is shown that the single-domain enthalpy-porous medium model not only provides complete information on the evoluation of macroscopic entities, but also enables a detailed analysis of the role of the mushy zone properties in the progress of solidification. In this context, the results of FEM calculations for aqueous ammonium chloride solutions are presented showing the importance of anisotropy of permeability and thermal conductivityof the mushy zone. Next, to account for non-equilibrium phenomenon of the constitutional undercooling a new front tracking technique on a fixed grid, which is based on the kinetics of dendritic growth, (see a companion paper [13]), is used. The model is compared with the enthalpy approach showing its superiority in the detection of the undercooled zone in front of dendrite tips and, thus, in modelling of columnar /equiaxed grain structures. It is, then, further used to address the question of the influence of alloy composition on the size of the undercooled liquid zone in front of columnar dendrite tips during solidification of Al-Cu alloys driven by conduction in a square mould. Eventually, a possible scenario of the coupling of both models, in order to develop a comprehensive computer simulation of binary alloys solidification driven by both conduction and natural convection, is outlined.

Słowa kluczowe

EN

alloy solidification; columnar/equiaxed mushy zone; fixed grid; front tracking; numerical modelling

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2003
• Tom: Vol. 24, no 1
• Strony: 37--57
• Opis fizyczny: Bibliogr. 22 poz.,

Twórcy

autor

Banaszek J.

• University College Dublin, Ireland
• Warsaw University of Technology

autor

Furmański P.

• University College Dublin, Ireland

autor

Browne D.

• Warsaw University of Technology

Bibliografia

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