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Draining of gas bubbles at interface between two liquids-some observations
ESSAR Steel Ltd., Hazira.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
Indian Institute of Technology, Bombay.
2015 (English)In: Proceedings of the 6th International Congress on the Science and Technology of Steelmaking: ICS 2015, Beijing, China; 12 - 14 May 2015 / [ed] X. Wang, The Chinese Society for Metals , 2015, 328-331 p.Conference paper (Refereed)
Abstract [en]

In steelmaking operations, slag foaming plays an important role in energy efficiency, heat transfer and process kinetics. A cold model simulation of slag foaming phenomenon in steel making operation was conducted to understand the effect of viscosity, density and interfacial energy between steel and slag on foaming. The experimental study was conducted at room temperature using water and oils of different viscosities which represent steel and slag respectively. Experiments on individual bubble motion across water-oil interface showed that the residence time of bubble at the interface increased with increase in interfacial tension. It also showed the foam index was influenced by the carryover of water across the interface by gas bubbles which in turn depend on the velocity of gas, density and viscosity of the mediums. Foaming experiments with oil phase only showed that the foaming height increased with increase in viscosity and decreased with further increase in viscosity by varying the gas velocity. Foam index in the oil phase experiments decreased with increase in gas velocity. But in water-oil system, the trend was entirely different from only oil phase experiment showing that the foam height and foam index not only depends on viscosity, density difference between the phases but also on the amount liquid transfer that takes place across the interface which affects the residence time of the bubbles

Place, publisher, year, edition, pages
The Chinese Society for Metals , 2015. 328-331 p.
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-35055Local ID: 96f59b0a-7c36-4a2e-8d03-6e674fa046bcISBN: 9780000000002OAI: oai:DiVA.org:ltu-35055DiVA: diva2:1008307
Conference
International Congress on the Science and Technology of Steelmaking : 12/05/2015 - 14/05/2015
Note
Godkänd; 2015; 20160526 (andbra)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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Nurni, Viswanathan
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