Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Steelmaking
Relation between Mass Transfer Coefficient and Stirring Power during Gas Bubbling in Molten Steel
Atsushi OkayamaYoshihiko Higuchi
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2019 Volume 105 Issue 8 Pages 793-802

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Abstract

Nitrogen gas absorption phenomena in molten steel during bottom bubbling were experimentally studied. Changes of nitrogen in molten steel were observed with 10, 14 and 200 kg scale experiments and it was confirmed that absorption rate of nitrogen were controlled by mass transfer. In addition, bubble dispersions in each experiments were visualized with volume of fluid method (VOF) solver of OpenFOAM and the area of free surface, AS and bubble, AB were numerically evaluated.

The measured data were evaluated with a mixed control model of liquid-phase, gas-phase and chemical reaction. Numerically evaluated AS and AB were utilized for separation from volumetric rate constant of nitrogen absorption, Akm to mass transfer coefficient, km. As a result, mass transfer coefficient at bubble, km,B and free surface, km,S were obtained. In addition, relation between stirring power density, ε ˙ and both km,B and km,S were investigated and it was revealed that km,B and km,S increased in proportion to ε ˙ 0.6.

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© 2019 The Iron and Steel Institute of Japan
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