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Open AccessArticle

Physical and Numerical Modelling on the Mixing Condition in a 50 t Ladle

1
Central Iron and Steel Research Institute, No.76 Xueyuan Nanlu, Haidian District, Beijing 100081, China
2
Department of Materials Science and Engineering, KTH-Royal Institute of Technology, Brinellvägen 23, SE-100 44 Stockholm, Sweden
*
Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1136; https://doi.org/10.3390/met9111136
Received: 26 September 2019 / Revised: 12 October 2019 / Accepted: 19 October 2019 / Published: 23 October 2019
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° is shortest. In addition, the mixing time using a radial angle of 135° 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°~180° are chosen for gas stirring in the present study when using dual porous plugs. View Full-Text
Keywords: ladle; gas bubbling; tracer mixing; physical modelling; mathematical modelling ladle; gas bubbling; tracer mixing; physical modelling; mathematical modelling
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MDPI and ACS Style

Liu, Y.; Bai, H.; Liu, H.; Ersson, M.; Jönsson, P.G.; Gan, Y. Physical and Numerical Modelling on the Mixing Condition in a 50 t Ladle. Metals 2019, 9, 1136.

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