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A physical model study of swirl phenomena in a top blown bath
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
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2006 (English)In: Steel Research International, ISSN 1611-3683, Vol. 77, 234-241 p.Article in journal (Refereed) Published
Abstract [en]

The present study is focused on swirl motion in a top blown water model, where a deep water swirl motion is observed. During the experiments, the top lance, with cylindrical nozzles, was placed above the water surface and thereby produced an external force on the bath. The effect on how different parameters, such as nozzle diameter and the distance between the bath surface and nozzle exit, i.e. the lance height, affect the swirl motion were studied. More specifically, the amplitude and period of the swirl as well as the starting and damping time of the swirl were determined. The amplitude was found to increase with an increased nozzle diameter and gas flow, while the period had a constant value of about 0.5 s for all nozzle diameters, gas flows and lance heights. The starting time for the swirl motion was found to decrease with an increased gas flow, while the damping time was found to be independent of gas flow rate, nozzle diameter, lance height and ratio of depth to diameter.

Place, publisher, year, edition, pages
2006. Vol. 77, 234-241 p.
Keyword [en]
Nozzles, Physical properties, Steel, Surface properties, Water, Bath, Lance, Physical modeling, Swirl, Swirling flow
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-24670ISI: 000237794000002Scopus ID: 2-s2.0-33646267693OAI: oai:DiVA.org:kth-24670DiVA: diva2:352568
Note

QC 20100921

Available from: 2010-09-21 Created: 2010-09-21 Last updated: 2016-04-27Bibliographically approved
In thesis
1. A Study of Top Blowing with Focus on the Penetration Region
Open this publication in new window or tab >>A Study of Top Blowing with Focus on the Penetration Region
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2010. viii, 38 p.
Identifiers
urn:nbn:se:kth:diva-13307 (URN)978-91-7415-675-1 (ISBN)
Public defence
2010-06-04, Studio C, KTHB, Osquars Backe 31, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
QC 20100921Available from: 2010-06-11 Created: 2010-06-11 Last updated: 2010-09-21Bibliographically approved
2. A physical modeling study of top blowing with focus on the penetration region
Open this publication in new window or tab >>A physical modeling study of top blowing with focus on the penetration region
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis work aimed at increasing the knowledge regarding phenomena occurring when gas is injected using a top-blown lance on to a bath. All results are based on physical modeling studies carried out both using low and high gas flow rates and nozzle diameters ranging from 0.8 mm to 3.0 mm. At the low gas flow rates, the penetration depth in the bath was studied. The experiments focused on studying the effect of nozzle diameter, lance height and gas flow rate on the penetration depth. It was found that the penetration depth increases with decreasing nozzle diameter, decreasing lance height and with increasing gas flow rate. The results were also compared with previous work. More specifically, it was studied how the previous published empirical relationships fitted the current experimental data. It was found that the relationships of Banks [1], Davenport [2], Chatterjee [3] and Qian [4] agreed well with the experimental data of this investigation for nozzle diameters of 2.0 mm and 3.0 mm. However, for smaller nozzle diameters there were considerable deviations. Therefore, a new correlation heuristically derived from energy conservation consideration was suggested and showed better agreement for small nozzle diameters.

The experiments carried out at higher gas flow rates focused on the study of swirl motion. The effects of nozzle diameter, lance height, gas flow rate and aspect ratio on the swirl motion were investigated. The amplitude and period of the swirl as well as the starting time and the damping time of the swirl were determined. The amplitude was found to increase with an increased nozzle diameter and gas flow rate, while the period had a constant value of about 0.5 s for all nozzle diameters, gas flow rates and lance heights. The starting time for the swirl motion was found to decrease with an increased gas flow, while the damping time was found to be independent of gas flow rate, nozzle diameter, lance height and ratio of depth to diameter.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. viii, 16 p.
Keyword
Materials science, physical modelling, top blown converters, lances, blowing, penetration, swirl, Materialvetenskap
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-284 (URN)91-7283-970-8 (ISBN)
Presentation
2005-03-18, B2, Brinellvägen 23, Stockholm, 10:00
Supervisors
Note
QC 20101217Available from: 2005-07-06 Created: 2005-07-06 Last updated: 2010-12-17Bibliographically approved

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