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An Experimental and Numerical Study of theFilling of a Steel Sampler
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.ORCID iD: 0000-0003-1919-9964
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

During the steelmaking process, it is important to understand the origin, types and nature ofinclusions. After an initial period of heating, mixing and chemical reactions in an electric arcfurnace and some crucial processes in a ladle, taking liquid steel samples in the ladle is a criticalstep in monitoring the inclusion population. This paper presents a study of filling of a steelsampler process as well as the primary inclusion dispersions inside a steel sample. To betterunderstand the influence of filling on the inclusion populations, physical modelings of waterfilling in a rectangular-shaped vessel have been carried out to study flow fields. The flow fieldswere obtained by a Particle Image Velocimetry. Thereafter, simulation of water samplers havebeen done to mathematically study the flow fields. The physical modeling data were used forverification of the model predictions, including the selection of the most appropriate turbulencemodel. Finally, simulations of the filling of liquid steel were carried out for a rectangular-shapedsampler, which is used in the laboratory.

Keyword [en]
steel sampler, filling, flow pattern, vortex, PIV, turbulent flow, Wilcox k-ω model, inclusions
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-24420ISRN: KTH/MSE--10/35--SE+APRMETU/ARTOAI: oai:DiVA.org:kth-24420DiVA: diva2:349669
Note
QC 20100908Available from: 2010-09-08 Created: 2010-09-08 Last updated: 2010-09-08Bibliographically approved
In thesis
1. On the Study of a Liquid Steel Sampling Process
Open this publication in new window or tab >>On the Study of a Liquid Steel Sampling Process
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The liquid steel sampling method is one of the commonly used procedures in monitoring the steelmaking process. Besides it can be used for analyzing the dissolved alloys, hydrogen content and oxygen content, it can be also employed to monitor the inclusion characteristics at the steelmakings. Here, a crucial point is that the steel sampler should be filled and the metal solidifies without changing the inclusion characteristics. Therefore, the objective of this work is to fundamentally understand the liquid steel sampling process by means of analyzing and modeling the two-phase flow during the sampler filling process, and verifying the mathematical model by using the experimental data.

The present dissertation presents an experimental and theoretical study of the filling process of both the lollipop-shaped sampler and the rectangular-shaped sampler. Firstly, a physical modeling by using a water model has been carried out to fundamentally investigate the flow pattern inside the sampler vessels during its filling. The flow patterns were obtained by a PIV system. Then, a mathematical model has been built to theoretically understand the phenomena. The commercial CFD code was used. Here, different turbulence model have been compared between the realizable k-ε turbulence model and Wilcox k-ω turbulence model. It concludes that the Wilcox k-ω turbulence model agrees well with the PIV measurements.HH

Thus, the preferred it was further employed to predict the turbulent flow inside the production lollipop-shaped sampler fillings. It is important to find that the average collision volume in the production steel sampler without solidification at filling is about 30 times higher than that in a ladle furnace.

In the end, the whole sampling system was modeled. The initial solidification during the filling was taken into account. Focus was on the influence of the initial solidification on the inclusion concentrations. A discrete phase model was used to simulate the movement of inclusions in the liquid steel. Some selected different sized primary inclusions that exist in the ladles at a steelmaking process were simulated.

The same method of studying the filling procedure of the lollipop-shaped sampler was further applied to comprehensively investigate the rectangular-shaped sampler.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 47 p.
National Category
Metallurgy and Metallic Materials Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-24385 (URN)978-91-7415-704-8 (ISBN)
Public defence
2010-09-17, Salongen KTHB, Osquars Backe 31,KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100908Available from: 2010-09-08 Created: 2010-09-07 Last updated: 2012-02-24Bibliographically approved

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