Shape Factor Effect on Inclusion Sedimentation in Aluminum Melts

The quality requirements of aluminum products are steadily increasing, and the presence of non-metallic inclusions have a large impact on the quality of aluminum products. Sedimentation is a widely applied technique to remove inclusions and the settling characteristic of particles is one of the most...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2020-04, Vol.51 (2), p.850-860
Main Authors: Gökelma, Mertol, Einarsrud, Kristian Etienne, Tranell, Gabriella, Friedrich, Bernd
Format: Article
Language:English
Subjects:
Aluminum
Characterization and Evaluation of Materials
Chemistry and Materials Science
Computational fluid dynamics
Drag
Fluid flow
Free convection
Liquid metals
Materials Science
Melts
Metallic Materials
Nanotechnology
Nonmetallic inclusions
Particle tracking
Sedimentation
Sedimentation & deposition
Settling velocity
Shape effects
Shape factor
Stokes law (fluid mechanics)
Structural Materials
Surfaces and Interfaces
Thin Films
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Summary:The quality requirements of aluminum products are steadily increasing, and the presence of non-metallic inclusions have a large impact on the quality of aluminum products. Sedimentation is a widely applied technique to remove inclusions and the settling characteristic of particles is one of the most important parameters determining the removal efficiency. The settling characteristics can be modeled analytically through different approaches. A comparison of settling according to the Stokes and Schiller and Naumann drag force formulations was investigated and showed that Stokes drag is relevant for inclusions in aluminum melts. The settling of particles is analytically and experimentally investigated in this study by using a shape factor “ K ” based on Stokes law and online particle tracking by LiMCA (Liquid Metal Cleanliness Analyzer), respectively. The effect of the shape factor on settling velocities was observed clearly and the measured data show considerably slower settling than traditional models, indicating the effect of melt flow due to thermal convection.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-020-01769-0