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Simulations of the LadleTeeming Process and Verification With Pilot Experiment
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.
2013 (Engelska)Ingår i: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 84, nr 3, s. 276-287Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The ladle teeming process was investigated by 2D axis-symmetrical mathematical models and a pilot-plant experiment. Different turbulence models, including the low Reynolds number k-epsilon model and the realizable k-epsilon model both with an enhanced wall treatment (EWT) and a standard wall function (SWF), were used to simulate this process. All of these turbulence model predictions generally agreed well with the experimental results. The velocity distributions in the nozzle were also predicted by these turbulence models. At the late stage of the teeming process, the drain sink flow phenomenon was studied. The combination of an inclined ladle bottom and a gradually expanding nozzle was found to be an effective way to alleviate a drain sink flow.

Ort, förlag, år, upplaga, sidor
2013. Vol. 84, nr 3, s. 276-287
Nyckelord [en]
drain sink, fluid flow, ladle, numerical simulation, pilot-plant experiment, teeming
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
URN: urn:nbn:se:kth:diva-118658DOI: 10.1002/srin.201200155ISI: 000315822700010Scopus ID: 2-s2.0-84875200702OAI: oai:DiVA.org:kth-118658DiVA, id: diva2:607120
Anmärkning

QC 20130404

Tillgänglig från: 2013-02-21 Skapad: 2013-02-21 Senast uppdaterad: 2017-12-06Bibliografiskt granskad
Ingår i avhandling
1. Numerical Study on Steel Flow and Inclusion Behavior during a Ladle Teeming Process
Öppna denna publikation i ny flik eller fönster >>Numerical Study on Steel Flow and Inclusion Behavior during a Ladle Teeming Process
2013 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Inclusions in molten steel have received worldwide concern due to their serious influence on both the steel product quality and the steel production process. These inclusions may come from the deoxidation process, reoxidation by air and/or slag due to an entrainment during steel transfer, and so on. They can break up a casting process by clogging a nozzle. A good knowledge on both steel flow and inclusion behavior is really important to understand nozzle clogging, as well as to take some possible measures to alleviate clogging. In this thesis, steel flow and inclusion behavior during a teeming process were investigated by mathematical simulations with verification by pilot-plant experiments.

Firstly, steel flow phenomena during a ladle teeming process were studied. Different turbulence models, including the low Reynolds number k-ɛ model and the realizable k-ɛ model both with an enhanced wall treatment (EWT) and a standard wall function (SWF), were used to simulate this process. All of these turbulence model predictions generally agreed well with the experimental results. The velocity distributions in the nozzle were also predicted by these turbulence models. A large difference of the boundary-layer velocity predicted with these two near wall treatment methods was found. At the late stage of the teeming process, the drain sink flow phenomena were studied. The combination of an inclined ladle bottom and a gradually expanding nozzle was found to be an effective way to alleviate a drain sink flow during teeming.

Then, inclusion behavior during a teeming stage was studied. A Lagranian method was used to track the inclusions in steel flow and compare the behaviors of different-size inclusions. In addition, a statistical analysis was conducted by the use of a stochastic turbulence model to investigate the behaviors of different-size inclusions in different nozzle regions. Inclusions with a diameter smaller than 20μm were found to have a similar trajectory and velocity distribution in the nozzle. However, inertia force and buoyancy force were found to play an important role for the behavior of large-size inclusions or clusters. The statistical analysis results indicate that the regions close to the connection between different angled nozzle parts seem to be very sensitive for an inclusion deposition.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2013. s. xii, 38
Nyckelord
steel flow, ladle teeming, numerical simulation, inclusion behavior, CFD, clogging, deposition.
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
urn:nbn:se:kth:diva-118848 (URN)978-91-7501-662-7 (ISBN)
Presentation
2013-03-21, Sefström (M131), Brinellvägen 23, KTH, Stockholm, 09:30 (Engelska)
Opponent
Handledare
Anmärkning

QC 20130305

Tillgänglig från: 2013-03-05 Skapad: 2013-03-01 Senast uppdaterad: 2013-03-05Bibliografiskt granskad

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