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Physical and Numerical Modelling on the Mixing Condition in a 50 t Ladle
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.ORCID iD: 0000-0002-4081-7766
Cent Iron & Steel Res Inst, 76 Xueyuan Nanlu, Beijing 100081, Peoples R China..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.ORCID iD: 0000-0003-4384-7984
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2019 (English)In: METALS, ISSN 2075-4701, Vol. 9, no 11, article id 1136Article in journal (Refereed) Published
Abstract [en]

The bubbly flow and mixing conditions for gas stirring in a 50t ladle were investigated by using physical modelling and mathematical modelling. In the physical modelling, the effect of the porous plugs' configurations on the tracer homogenization was studied by using a saturated NaCl solution to predict the mixing time and a color dye to show the mixing pattern. In the mathematical modelling, the Euler-Lagrange model and species transport model were used to predict the flow pattern and tracer homogenization, respectively. The results show that, for a +/- 5% homogenization degree, the mixing time with dual plugs using a radial angle of 180 degrees is shortest. In addition, the mixing time using a radial angle of 135 degrees decreases the most with an increased flow rate. The flow pattern and mixing conditions predicted by mathematical modelling agree well with the result of the physical modelling. For a +/- 1% homogenization degree, the influence of the tracer's natural convection on its homogenization pattern cannot be neglected. This is especially true for a 'soft bubbling' case using a low gas flow rate. Overall, it is recommended that large radial angles in the range of 135 degrees 180 degrees are chosen for gas stirring in the present study when using dual porous plugs.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 9, no 11, article id 1136
Keywords [en]
ladle, gas bubbling, tracer mixing, physical modelling, mathematical modelling
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-266526DOI: 10.3390/met9111136ISI: 000504411600004Scopus ID: 2-s2.0-85074235087OAI: oai:DiVA.org:kth-266526DiVA, id: diva2:1385786
Note

QC 20200115

Available from: 2020-01-15 Created: 2020-01-15 Last updated: 2020-01-15Bibliographically approved

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Liu, YuBai, HaitongErsson, MikaelJönsson, Pär

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