Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Effect of nozzle angle on flow field and temperature distribution in a billet mould when using swirl flow
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.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
Show others and affiliations
2008 (English)In: STEEL RES INT, ISSN 1611-3683, Vol. 79, no 1, 31-39 p.Article in journal (Refereed) Published
Abstract [en]

Recently, interesting effects have been noted in studies of swirl flow, particularly regarding billet moulds when considering a specific divergent angle of the immersion nozzle. Therefore, in the present work a numerical analysis and water model study of the mould region of a continuous casting apparatus are performed with changing the outlet divergent angles of the immersion nozzle using swirling flow in the pouring tube, to control the heat and mass transfer in the continuous casting mould. To make our studies consistent with the previous research, which was done based on a square billet, this time we investigate round billets. The results show that the distance from the meniscus of the centres of both the lower and upper circulation loops decreases systematically with increasing the divergent angle. This, in turn, leads to: (i) a more active heat and mass transport near the meniscus (particularly over 100 degrees); (ii) a gradual change from a concentric circulation to a more clearly logarithmic spiral from the mould wall to the nozzle on the meniscus, which leads to more active heat and mass transfer; (iii) a decreased penetration depth of nozzle outlet flow (even at a comparatively small divergent angle such as 20 degrees) and a superheat dissipation in the melt.

Place, publisher, year, edition, pages
2008. Vol. 79, no 1, 31-39 p.
Keyword [en]
swirl flow, divergent angle immersion nozzle, round billet mould, continuous casting
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-14184DOI: 10.2374/SRI07SP023ISI: 000253276600005Scopus ID: 2-s2.0-39049156424OAI: oai:DiVA.org:kth-14184DiVA: diva2:331541
Note

QC 20100723

Available from: 2010-07-23 Created: 2010-07-23 Last updated: 2016-05-02Bibliographically 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

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Kholmatov, ShavkatJonsson, LageJönsson, PärYokoya, Shinichiro
By organisation
Applied Process Metallurgy
Metallurgy and Metallic Materials

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 130 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf