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Published in: Metallurgical and Materials Transactions B 3/2023

21-03-2023 | Original Research Article

An Improved Columnar Solidification Model Coupled With Anisotropic Mush Permeability

Authors: Changjun Wang, Zhongqiu Liu, Baokuan Li, Jianxiang Xu

Published in: Metallurgical and Materials Transactions B | Issue 3/2023

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Abstract

To get a basic understanding of the solute transportation and chemical inhomogeneity in directional columnar structures, the anisotropic permeability law was integrated into a volume-averaged columnar solidification model. Ten isotropic and anisotropic permeability laws were adopted to discuss the effect of the mushy zone permeability on macrosegregation and channel segregation in a benchmark solidification problem. Results showed that the permeability coefficient had obvious effects on the global macrosegregation and the morphology and severity of channel segregation. An uneven solute distribution resembling the columnar morphology was observed. Anisotropic permeability laws predicted distinct and physically justified segregated channels because the effect of directional columnar structures on the solute transportation could be considered. The volume-averaged solidification model was verified by a grid sensitivity analysis. Calculating channel segregation was more sensitive to the mesh size than the macrosegregation. These findings preliminarily illustrated the importance of considering the anisotropy nature of columnar structures in numerical studies of channel segregation.

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Literature
42.
go back to reference R.B. Bird, W.E. Stewart, and E.N. Lightfoot: Transport Phenomena, Wiley, New York, 1960. R.B. Bird, W.E. Stewart, and E.N. Lightfoot: Transport Phenomena, Wiley, New York, 1960.
Metadata
Title
An Improved Columnar Solidification Model Coupled With Anisotropic Mush Permeability
Authors
Changjun Wang
Zhongqiu Liu
Baokuan Li
Jianxiang Xu
Publication date
21-03-2023
Publisher
Springer US
Published in
Metallurgical and Materials Transactions B / Issue 3/2023
Print ISSN: 1073-5615
Electronic ISSN: 1543-1916
DOI
https://doi.org/10.1007/s11663-023-02761-0

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