The role of the dendritic growth model dimensionality in predicting the Columnar to Equiaxed Transition (CET) - Heat and Mass Transfer

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ID: 268347
2017
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Abstract
The dendrite tip kinetics model accuracy relies on the reliability of the stability constant used, which is usually experimentally determined for 3D situations and applied to 2D models. The paper reports authors` attempts to cure the situation by deriving 2D dendritic tip scaling parameter for aluminium-based alloy: Al-4wt%Cu. The obtained parameter is then incorporated into the KGT dendritic growth model in order to compare it with the original 3D KGT counterpart and to derive two-dimensional and three-dimensional versions of the modified Hunt’s analytical model for the columnar-to-equiaxed transition (CET). The conclusions drawn from the above analysis are further confirmed through numerical calculations of the two cases of Al-4wt%Cu metallic alloy solidification using the front tracking technique. Results, including the porous zone-under-cooled liquid front position, the calculated solutal under-cooling, the average temperature gradient at a front of the dendrite tip envelope and a new predictor of the relative tendency to form an equiaxed zone, are shown, compared and discussed for two numerical cases. The necessity to calculate sufficiently precise values of the tip scaling parameter in 2D and 3D is stressed.
Reference Key
seredyński2017heatthe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors M. Seredyński;M. Rebow;J. Banaszek;M. Seredyński;M. Rebow;J. Banaszek;
Journal heat and mass transfer
Year 2017
DOI
doi:10.1007/s00231-017-2070-z
URL
https://link.springer.com/article/10.1007/s00231-017-2070-z/fulltext.html
Keywords
thermodynamics Heat and Mass Transfer engineering thermodynamics industrial chemistry/chemical engineering thermodynamics Heat and Mass Transfer engineering thermodynamics industrial chemistry/chemical engineering

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