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Transport and Deposition of Non‐Metallic Inclusions in Steel Flows‐ A Comparison of Different Model Predictions to Pilot Plant Experiment Data
Author(s) -
Ni Peiyuan,
Jonsson Lage Tord Ingemar,
Ersson Mikael,
Jönsson Pär Göran
Publication year - 2017
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201700155
Subject(s) - deposition (geology) , turbulence , ladle , non metallic inclusions , inclusion (mineral) , mechanics , flow (mathematics) , materials science , boundary layer , reynolds stress , boundary (topology) , reynolds number , metallurgy , mathematics , thermodynamics , geology , physics , mathematical analysis , paleontology , sediment
Inclusion behavior during a ladle teeming process is investigated. A Lagrangian method is used to track different‐size inclusions and to compare their behaviors in steel flows, solved by the realizable k ‐ ϵ model with SWF (Standard Wall Function), realizable k ‐ ϵ model with EWT (Enhanced Wall Treatment), and RSM (Reynolds Stress Model). The results show that inclusion tracking based on the realizable k ‐ ϵ model with SWF to predict the steel flow does not agree with the data from plant experiments. The predicted number of inclusions touching the wall shows almost no dependence on inclusion size. This is due to that the boundary layer is not resolved. The inclusion deposition predicted using the realizable k ‐ ϵ model with EWT and the RSM model to predict the steel flow generally agrees with the experimental observations. However, the large size inclusion deposition is over‐predicted when using the realizable k ‐ ϵ model with EWT. More specifically, the prediction for 20 μm inclusions is three times larger than that with the RSM. This is due to that this model cannot calculate the anisotropic turbulence fluctuations. In summary, the turbulence properties in the near‐wall boundary layer are found to be very important for a good prediction on inclusion deposition.