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Effect of nozzle angle on flow field and temperature distribution in a billet mould when using swirl flow
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
Vise andre og tillknytning
2008 (engelsk)Inngår i: STEEL RES INT, ISSN 1611-3683, Vol. 79, nr 1, s. 31-39Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2008. Vol. 79, nr 1, s. 31-39
Emneord [en]
swirl flow, divergent angle immersion nozzle, round billet mould, continuous casting
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-14184DOI: 10.2374/SRI07SP023ISI: 000253276600005Scopus ID: 2-s2.0-39049156424OAI: oai:DiVA.org:kth-14184DiVA, id: diva2:331541
Merknad

QC 20100723

Tilgjengelig fra: 2010-07-23 Laget: 2010-07-23 Sist oppdatert: 2016-05-02bibliografisk kontrollert
Inngår i avhandling
1. On Some Positive Effects of the Swirl on Fluid Flow and Heat Transfer During Mould Filling
Åpne denne publikasjonen i ny fane eller vindu >>On Some Positive Effects of the Swirl on Fluid Flow and Heat Transfer During Mould Filling
2009 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Stockholm: KTH, 2009. s. viii, 66
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-10624 (URN)978-91-7415-372-9 (ISBN)
Disputas
2009-06-11, Sal B2, KTH, Brinellvägen 23, Stockholm, 13:00 (engelsk)
Opponent
Veileder
Merknad
QC 20100723Tilgjengelig fra: 2009-06-08 Laget: 2009-06-08 Sist oppdatert: 2010-07-23bibliografisk kontrollert
2. On some positive effects of swirling flow for the continuous cast mould billets
Åpne denne publikasjonen i ny fane eller vindu >>On some positive effects of swirling flow for the continuous cast mould billets
2007 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2007. s. vi, 37
Emneord
swirling flow, round mould, divergent angle, aspect ratio, temperature distribution, velocity fluctuations, continuous casting of steel, mathematical modeling, CFD
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4453 (URN)
Presentation
2007-05-14, B3, KTH, Brinellvägen 23, Stockholm, 10:00
Opponent
Veileder
Merknad

QC 20101110

Tilgjengelig fra: 2007-06-26 Laget: 2007-06-26 Sist oppdatert: 2014-07-10bibliografisk kontrollert

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