This numerical modeling study consists of two main parts. The first part is related to the simulation of industrial scale continuous slab casting systems, while the second part deals with the simulation of a twin-roll thin-strip casting process. In the first part, a numerical investigation was conducted for exploring the steady state transport phenomena of coupled turbulent flow, heat transfer and macroscopic solidification in a continuous stainless steel slab caster. The solidification of molten steel was modeled through the implementation of the popular enthalpy-porosity and/or continuum modeling techniques. A series of simulations was carried out to investigate the effects of the casting speed, the delivered superheat, the immersion depth of the twin-ported submerged entry nozzle (SEN) and mold wall heat extraction rate on the velocity and temperature distributions and on the extent of the solidified and mushy regions on the narrow and broad faces of the caster. / Next, the model was further developed to take into account two other important aspects of the continuous casting processes, namely electromagnetic flow control and bubble gas injection. For the electromagnetic part, the continuum model equations were solved simultaneously to study the usefulness of five different commercially used electromagnetic braking (EMBR) configurations in continuous slab casting processes. The predicted results showed that the minimum thickness of the solidifying shell at the mold exit increases due to the application of the EMBR devices. / In a separate effort, the program was further advanced by incorporating the multiphase continuum model for simulating the argon gas bubble injection via the submerged entry nozzle (SEN) into the mold. The predicted results from this study showed that the flow pattern and temperature distribution were significantly influenced by the bubble injection especially in the upper part of the mold. The gas bubbles with smaller sizes were found to travel deeper towards the narrow face of the slab and spread wider in the mold. / In the second part, a numerical study was carried out to investigate the two-dimensional turbulent flow, heat transfer and macroscopic solidification in a twin-roll thin-strip casting machine. The arbitrary nature of the computational domain was accounted for through the use of a non-orthogonal boundary-fitted coordinate (BFC) system on a staggered grid. The developed code was later used to study the sensitivity of the model parameters such as Darcy coefficient and turbulent viscosity modification factor in the mushy region as well as the effect of the casting parameters on the thin-strip twin-roll casting operations. (Abstract shortened by UMI.)
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.34679 |
| Date | January 1997 |
| Creators | Seyedein, Seyed Hossein. |
| Contributors | Hasan, M. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Mining and Metallurgical Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001616958, proquestno: NQ37023, Theses scanned by UMI/ProQuest. |
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