The paper explores the potential of a recently developed special front tracking method in the identification of the interface between columnar and equiaxed structures formed during a binary alloy solidification, driven by thermosolutal convection. The method, based on theoretical and experimental dendrite tip kinetics, is capable of directly distinguishing between the columnar mush and the undercooled liquid/equiaxed region developing ahead of the dendrite tip curve. A new numerical model and its computational algorithm are proposed, where the classical Eulerian volume averaged description of the transport processes is coupled with the Lagrangian front tracking method on a fixed control-volume grid. Having thus distinguished zones of different dendrite structures, distinct simulation models are used within each of the zones, e.g., the Darcy’s porous medium model in the stationary dendrite region, and a model of slurry with floating dendrites in the equiaxed part of the mush. The calculated temperature and solute concentration fields are compared with the relevant results of the classical enthalpy-porosity model, for an example problem of Pb-48 Sn alloy solidification driven by diffusion and thermosolutal convection. And a good match with both solutions is exhibited. A preliminary validation study is also presented by comparing the available experimental data with the model predictions. Possible reasons for some observed discrepancies between the calculations and the experimental findings are discussed. Finally, the proposed front tracking approach is used to address the question of the impact of dendrites floating in the liquid on the flow pattern and macrosegregation in the solidifying alloy.
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Front Tracking Based Macroscopic Calculations of Columnar and Equiaxed Solidification of a Binary Alloy
J. Banaszek
J. Banaszek
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M. Seredyński
J. Banaszek
J. Heat Transfer. Oct 2010, 132(10): 102301 (10 pages)
Published Online: July 23, 2010
Article history
Received:
March 27, 2009
Revised:
February 22, 2010
Online:
July 23, 2010
Published:
July 23, 2010
Citation
Seredyński, M., and Banaszek, J. (July 23, 2010). "Front Tracking Based Macroscopic Calculations of Columnar and Equiaxed Solidification of a Binary Alloy." ASME. J. Heat Transfer. October 2010; 132(10): 102301. https://doi.org/10.1115/1.4001362
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