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Dissertation
Coupled heat transfer and fluid flow analysis in the Hazelett twin-belt caster
Doctor of Philosophy (Ph.D.), Drexel University
Nov 1988
DOI:
https://doi.org/10.17918/00005768
Abstract
The twin-belt (Hazelett) process incorporates two cooled continuously moving thin metal belts wrapped around pulleys which tension and drive the belts at a predetermined speed. A coupled heat transfer and fluid flow mathematical model was developed which describes the twin-belt casting process to predict the metallurgical integrity of the cast product, as well as to evaluate process variable effects on the cast product. The k-e turbulence model was used to calculate turbulent viscosity in the melt pool. In addition, heat flux data at belt surface has been experimentally measured and used as boundary conditions for the heat transfer model. Lastly, a model has been developed which describes inclusion trajectories in solidifying slab using theoretical principles. The resultant differential equations were solved numerically using a Digital computer. The process variables considered were the belt speed, nozzle width and cooling conditions of the belt. 3105 and 5182 aluminum alloys, and 1020 steel were considered as cast metals. It was expected that the variation of computed cell size across the thickness of the aluminum alloys would be small in comparision to the steel slab castings. Effects of casting speed on the cooling rate and cell size of aluminum alloys become prominent when the temperature interval of mushy zones increase. Calculated inclusion trajectories indicate that it is difficult for inclusions to float and be absorbed in slag in the Hazelett type horizontal type caster. As indicated earlier, inclusions can significantly affect the quality of products from horizontal casters such as the twin belt caster. This paper demonstrates models for idealized process controls and the optimization of the integrity of the cast slab.
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Details
- Title
- Coupled heat transfer and fluid flow analysis in the Hazelett twin-belt caster
- Creators
- Yoon-Gi Kim
- Contributors
- Diran Apelian (Advisor) - Drexel University, Drexel University (1970-)Bakhtier Farouk (Advisor) - Drexel University, Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xvii, 142 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- Materials (Science and) Engineering (Metallurgical Engineering) [Historical]; College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991021888906704721