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Effects of Salt Tracer Amount, Concentration and Kind on the Fluid Flow Behavior in a Hydrodynamic Model of Continuous Casting Tundish
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, China.ORCID iD: 0000-0001-7953-1127
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, China.
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, China.
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Chaina.
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2012 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 83, no 12, 1141-1151 p.Article in journal (Refereed) Published
Abstract [en]

The hydrodynamic modeling method that widely used to simulate the fluid flow was reconsidered and discussed in this paper. The effects of injected salt tracer amount, concentration and kind on the fluid flow behavior in a hydrodynamic model tundish were investigated. The results were compared with the mathematical modeling calculation results, that the tracer density effect was eliminated. The residence time distribution (RTD) curve of tracer introduced deviated to the left side of the calculated curve, besides the deviation was increased as dimensionless tracer amount (the ratio of tracer amount to hydrodynamic model tundish volume) increased from 0.202 × 10−3 to 1.008 × 10−3. The results of tracer concentration study were similar, namely the deviation was increased with concentration increased; on the other hand, the deformation of a “stair-shape” RTD curve occurred when tracer concentration was much lower (at dimensionless tracer amount of 0.168 × 10−3 with converting to saturated solution). Besides, the effect of tracer kind on the accuracy of hydrodynamic modeling was also studied; the measurements of KCl solution with lower density than that of NaCl solution exhibited more of accuracy. Finally, the optimized tracer in hydrodynamic model tundish of present work is saturated KCl solution with dimensionless tracer amount of 0.202 × 10−3.

Place, publisher, year, edition, pages
John Wiley & Sons, 2012. Vol. 83, no 12, 1141-1151 p.
Keyword [en]
hydrodynamic model method;tundish;residence time distribution;tracer;continuous casting
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-168396DOI: 10.1002/srin.201200086ISI: 000312153200004Scopus ID: 2-s2.0-84870540588OAI: oai:DiVA.org:kth-168396DiVA: diva2:816217
Note

QC 20150615

Available from: 2015-06-02 Created: 2015-06-02 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Some Aspects on Macroscopic Mixing in a Tundish
Open this publication in new window or tab >>Some Aspects on Macroscopic Mixing in a Tundish
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Two aspects on macroscopic mixing in a continuous flow system – metallurgical tundish were studied. Specifically, 1) the first focus was on salt solution tracer mixing, which is important for tundish design from perspectives of tracer technology and Residence Time Distributions (RTD) as well as for the understanding of the macroscopic mixing in tundishes. The different amounts of salt solution tracer mixing in a tundish were studied by using both physical models and mathematical models. The disturbance of KCl salt tracer on the flow in the tundish with respect to different amounts is like the “butterfly effect”, i.e. only a slight increase of the amount of tracer, the flow field might be disturbed. This, in turn, will result in a shifted RTD curve. 2) The second focus was on Eulerian modeling of inclusions macroscopic transport and removal, which is important for tundish design from perspectives of inclusions removal and to provide information of macroscopic removal of inclusions. In the study, an approach that combined the meso-scale inclusions deposition at turbulent boundary layers of steel-slag interface and the macroscopic transport of inclusions in the tundish was used. The theoretical calculation results showed that the effect of the roughness on the deposition velocity of small inclusions (radius of 1 μm) were more pronounced than that for the big inclusions (up to the radius of 9 μm). The dynamic inclusions removal studies showed that the tundish with a weir and a dam exhibited a better performance with respect to the removal of bigger inclusions (radii of 5 μm, 7 μm and 9 μm) than that of the case without weirs and dams. However, the tundish without weirs and dams showed a higher removal ratio of smaller inclusions (radius of 1 μm).

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2015. x, 24 p.
Keyword
continuous reactor, tundish, tracer, macroscopic mixing, water model, CFD, turbulence models, inclusions removal, inclusions deposition, dynamic removal
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-168402 (URN)978-91-7595-632-9 (ISBN)
Public defence
2015-08-28, B2, Brinellvägen 23, KTH, Stockholm, 10:00 (English)
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Note

QC 20150615

Available from: 2015-06-15 Created: 2015-06-02 Last updated: 2015-06-15Bibliographically approved

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