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Professor Thomas's research is in the field of metals processing and focuses on the computational modeling of continuous casting of steel and related processes.
His modeling includes simulation of fluid flow, mass transport, heat transfer, solidification, deformation, and stress. By combining the results of his computational model calculations together with laboratory experiments, metallographic analysis, and measurements on operating commercial casters, he has generated fundamental knowledge about how the continuous casting process works, how defects form, and how quality can be improved. His research has quantified many of the phenomena which govern the continuous casting process, such as turbulent, multiphase fluid flow in the mold cavity, inclusion particle transport and entrapment, interfacial heat transfer and friction, distortion and crack formation. It has demonstrated the importance of mixing in both the tundish and strand during grade transitions when different grades of steel are cast sequentially, and has quantified the large difference between internal and surface compositions when strand mixing is important. This research has explained the mechanisms for how important microstructural features such as oscillation marks and subsurface hooks form during initial solidification at the meniscus. His favorite research activity is to compare the predictions of fundamentally-based models with experimental measurements. Examples in steel casters include fluid velocity and temperature in the liquid pool, surface level fluctuations, particle entrapment locations, breakout shell growth profiles under transient conditions, strand composition gradients due to grade intermixing, off-corner surface depression shapes, slab mold distortion, and crack locations.
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Journal of microscopy (2024)
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCEno. 6 (2023): 2985-3009
IOP conference seriesno. 1 (2023): 012028-012028
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IEEE Transactions on Automatic Controlno. 6 (2023): 3485-3500
CDCpp.7370-7375, (2022)
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