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Development of flow field and temperature distribution during changing divergent angle of the nozzle when using swirl flow in a square continuous casting billet mould
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.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
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2007 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 47, no 1, 80-87 p.Article in journal (Refereed) Published
Abstract [en]

Recently, positive effects of swirl flow have been investigated, related to specific billet moulds with particular divergent angles in the immersion nozzles. (1-7)) Literature review showed that a systematic study of changes in the divergent angle in the immersion nozzle for continuous casting moulds had not been carried out. Therefore, in the present work we aim to investigate the development of flow field and temperature distribution inside the mould and on the meniscus while changing the divergent angle of the immersion nozzle. Swirl flow was used in the nozzle and the liquid entered a 3D square billet mould. Both physical and mathematical modelling was carried out to simulate nine different divergent angles between 0 and 160 degrees. The overall results of the study showed that a change in divergent angle has an effect on the flow pattern as well as the temperature distribution of the liquid steel in the mould. More specifically it was found that in the case of 100 degrees divergent angle nozzle billet we can observe a major shift of lower circulation compared to that of the 80 degrees nozzle billet. Furthermore, a noticeable increase of the temperature near the meniscus, for a square billet, and radial velocity component, for a round billet, was found when using the 100 degrees divergent angle nozzle compared to the 80 degrees divergent angle nozzle. Additionally, a uniform velocity and heat distribution was observed within a distance of 200 mm below the nozzle exit for nozzle outlets with 100 degrees divergent angles and larger.

Place, publisher, year, edition, pages
2007. Vol. 47, no 1, 80-87 p.
Keyword [en]
swirl flow, divergent angle of the immersion nozzle, billet continuous casting mould
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-14183DOI: 10.2355/isijinternational.47.80ISI: 000245601400011Scopus ID: 2-s2.0-34247189008OAI: oai:DiVA.org:kth-14183DiVA: diva2:331539
Note

QC 20150629

Available from: 2010-07-23 Created: 2010-07-23 Last updated: 2017-12-12Bibliographically approved
In thesis
1. On Some Positive Effects of the Swirl on Fluid Flow and Heat Transfer During Mould Filling
Open this publication in new window or tab >>On Some Positive Effects of the Swirl on Fluid Flow and Heat Transfer During Mould Filling
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2009. viii, 66 p.
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-10624 (URN)978-91-7415-372-9 (ISBN)
Public defence
2009-06-11, Sal B2, KTH, Brinellvägen 23, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
QC 20100723Available from: 2009-06-08 Created: 2009-06-08 Last updated: 2010-07-23Bibliographically approved
2. On some positive effects of swirling flow for the continuous cast mould billets
Open this publication in new window or tab >>On some positive effects of swirling flow for the continuous cast mould billets
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Continuous caster moulds are the last and most important stage in the steelmaking process, where inclusions can either be generated or removed. With increasing casting speed using conventional immersion nozzles critical problems, such as unstable bulk mould flow have been noticed. Mould flux entrapment due to vortex and shearing action from the oscillating surface waves have become of particular concern. It is therefore necessary to have a calm inlet flow at the entrance of the mould. Recently, it has been acknowledged that a swirl blade placed at the upstream of the immersion nozzle effectively resolves the problems arising from unstable bulk mould flow. Therefore, to increase the knowledge of effect of swirling flow on the flow pattern in the mould, fundamental mathematical models of a billet mould equipped with a swirl blade in the nozzle have been developed. The model was used to study the effect of divergent angle of the immersion nozzle and mould aspect ratio on the flow field and temperature distribution inside billets moulds. Data from water model experiments were used to verify the mathematical model predictions. A fairly good agreement was found between physical modeling data and predictions, which ensured that the numerical model is reliable. Thereafter, the differences between square and round billet moulds were studied. Next, the effect of changing aspect ratio of the rectangular mould on the fluid flow and heat transfer, while keeping mould surface area constant, was studied. Two types of immersion nozzles, bottomless and conventional, were also analyzed during the research. The model moulds were changed gradually from a square billet with an aspect ratio of 1x1 to a rectangular billet with an aspect ratio of 3x1. First, the temperature and velocity distributions were calculated. Later, unsteady calculations were done to determine velocity fluctuations on the meniscus level for two types of nozzles and several moulds geometries.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. vi, 37 p.
Keyword
swirling flow, round mould, divergent angle, aspect ratio, temperature distribution, velocity fluctuations, continuous casting of steel, mathematical modeling, CFD
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-4453 (URN)
Presentation
2007-05-14, B3, KTH, Brinellvägen 23, Stockholm, 10:00
Opponent
Supervisors
Note

QC 20101110

Available from: 2007-06-26 Created: 2007-06-26 Last updated: 2014-07-10Bibliographically approved

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