Bubble Size Measurement in a Continuous Casting Mold Using Physical Modeling and Shadowgraphy

Srivastava, A.; Dinda, Soumitra Kumar; Asgarian, Ali; Sengupta, Joydeep; Chattopadhyay, Kinnor

doi:10.1007/s11663-022-02521-6

Metall Mater Trans B

2022

DOI: 10.1007/s11663-022-02521-6

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Bubble Size Measurement in a Continuous Casting Mold Using Physical Modeling and Shadowgraphy

A. Srivastava

Soumitra Kumar Dinda

Ali Asgarian

et al.

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Cited by 3 publications

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Bubble Characteristics Required for the Complete Removal of Alumina Inclusions from Steel Melts

Guthrie,

Isac

2024

steel research int.

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Gas bubbling can be an effective means to float out alumina inclusions from liquid steel in a ladle. However, large spherical cap bubbles are formed when using porous plugs, as the liquid steel is nonwetting to the porous refractory. These bubbles rise rapidly through the liquid steel, forming a fast‐moving bubble plume, restricting contact times. Sized microbubbles, by contrast, have now been generated in liquid metals by shearing methods, involving linear crossflows to an entering flow of gas, or alternatively by rotational shearing. Combined with these convective shearing forces, local kinetic energy of turbulence can also play an important part in determining final microbubble size distributions. As microbubbles have much smaller rise velocities and present a far greater inclusion capture surface area than those of a single large bubble of the same gross volume, this will allow us to remove sub‐50 μm inclusions from liquid steel. It is expected that this goal will require a redesign of current ladle shrouds.

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Bubble Characteristics Required for the Complete Removal of Alumina Inclusions from Steel Melts

Guthrie,

Isac

2024

steel research int.

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Investigations on Vibrational Interpretations of Bubbles in Metal-Making Processes

Rigas

Willers

Eckert

et al. 2023

Metall Mater Trans B

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Vibration measurements were carried out using highly sensitive accelerometers in an experimental ladle integrated into the LIMMCAST (Liquid Metal Model for Steel Casting) facility at HZDR. The model is operated with liquid Sn–40 wt pctBi alloy at 200 °C, whose physical properties are close to those of molten steel. Three accelerometers were attached to the outer wall of the LIMMCAST vessel to record the vibrations caused by the argon bubble flow in the liquid metal at different process parameters. The results obtained at the liquid metal experiments differ from those reported for water models where the relationship between root mean square (RMS) value of the vibration amplitude and the gas flow rate follows different curve shapes. Furthermore, the results of vibration measurements in the LIMMCAST model are compared with vibration measurements in a steel plant during vacuum degassing. The comparison of the RMS data shows a fairly good agreement. This indicates that the vibrations in both the industrial process and the laboratory model are caused by the same physical mechanisms, and thus, the vibration behavior in an industrial steelmaking ladle can be reproduced quite well by suitable liquid metal models. These studies on bubble flows can help to improve the understanding of industrial stirring processes and thus contribute to a better process control.

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Vibrations Analysis of Bubble Evolution in Liquids of Varying Physical Properties

Rigas,

Willers,

Eckert

et al. 2023

Metall Mater Trans B

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In recent years there is an attempt to control the gas stirring intensity in metal-making ladles with the aid of vibration measurements. Understanding better the induced vibrations in two-phase flows can substantially improve the existing models for gas stirring control. In this work, highly sensitive accelerometers were used for the vibration measurements in a liquid metal alloy; Sn–40 wt pctBi alloy at 200 °C and water at 20 °C. The examination of the liquids was conducted in the ladle mockup integrated into the Liquid Metal Model for Steel Casting facility at Helmholtz-Zentrum Dresden Rossendorf. Single bubbles were generated in the respective liquids by controlled argon injection at low flow rates in the range of 0.01 to 0.15 NL min−1 through a single nozzle installed at the bottom of the ladle. Obtained results demonstrate differences between the induced vibrations in the examined liquids in terms of the magnitude of the root mean square values of vibration amplitude and the shape of the resulting curves with increasing flow rate. Furthermore, continuous wavelet transform reveals variations in the duration and vibrational frequency of the evolved bubble phenomena. The findings suggest that differences in the physical properties of the examined liquids result in variations in the vibrations induced during bubble evolution.

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Bubble Size Measurement in a Continuous Casting Mold Using Physical Modeling and Shadowgraphy

Cited by 3 publications

References 44 publications

Bubble Characteristics Required for the Complete Removal of Alumina Inclusions from Steel Melts

Bubble Characteristics Required for the Complete Removal of Alumina Inclusions from Steel Melts

Investigations on Vibrational Interpretations of Bubbles in Metal-Making Processes

Vibrations Analysis of Bubble Evolution in Liquids of Varying Physical Properties

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