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- Title
An Improved Columnar Solidification Model Coupled With Anisotropic Mush Permeability.
- Authors
Wang, Changjun; Liu, Zhongqiu; Li, Baokuan; Xu, Jianxiang
- 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.
- Subjects
CHEMICAL transportation; PERMEABILITY; SOLIDIFICATION; BENCHMARK problems (Computer science); SENSITIVITY analysis
- Publication
Metallurgical & Materials Transactions. Part B, 2023, Vol 54, Issue 3, p1275
- ISSN
1073-5615
- Publication type
Article
- DOI
10.1007/s11663-023-02761-0