Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Regular Article
Effect of Viscosity on Dispersion Behavior in Stratified Flow
Norifumi Asahara Katsuhiro FuchigamiMasafumi Zeze
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2023 Volume 109 Issue 9 Pages 721-727


Molten oxides are widely used as refining slag and mold flux in the steelmaking process. In the stationary state, the molten oxide and the molten iron form a layer due to their density difference. However, in the actual operation, they are partially mixed and dispersed as droplets, which can increase the slag-metal reaction area or cause the formation of nonmetallic inclusions. In this study, the dispersion behavior in density stratified flow was investigated by water model experiments. It was suggested that the dispersion behavior of silicone oil was affected by viscosity. As the kinematic viscosity was higher than 100 mm2/s, droplet generation tended to be less likely to occur.

The conventional equations for interface instability and energy balance underestimated the critical velocity of droplet generation when the kinematic viscosity of oil was higher than 100 mm2/s. On the other hand, we were able to reproduce the influence of viscosity in this experiment by applying the empirical formula using the Ohnesorge number. Furthermore, an energy balance formula including the influence of viscosity was newly constructed. We confirmed that the new formula agreed with the experimental results.

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© 2023 The Iron and Steel Institute of Japan

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