Measurement and modeling of heat transfer across interfacial mold flux layers |
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| Affiliation: | 2. The Boeing Company, 5301 Bolsa Avenue, MC H011-C132, Huntington Beach, CA 92647, USA;3. Department of Mechanical and Industrial Engineering, University of Illinois, Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801, USA;1. CAPEC-PROCESS Research Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark, Søltofts Plads, Building 229, DK-2800 Kgs. Lyngby, Denmark;2. Haldor Topsoe A/S, Haldor Topsøes Allé 1, DK-2800 Kgs. Lyngby, Denmark;1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;2. Key Laboratory for Spray Deposition Technology and Application of Hunan Province, Hunan University, Changsha 410082, China;1. Key Laboratory of Hydraulic Machinery Transients, Ministry of Education, School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China;2. School of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, 414006, China |
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| Abstract: | Surface quality problems in continuous cast steel are greatly affected by heat transfer across the interfacial layers in the gap between the solidifying steel shell and the mold. An experimental apparatus has been constructed to measure temperatures in the steel, mold flux layers, and copper under conditions approximating those in continuous casting. The flux solidified in multiple layers similar to those observed from continuous casting molds and contained many gas bubbles. Flux conductivities average about 1.0 W/m·K and appear to evolve with time. Contact resistances at both interfaces are significant and average about 0.0015 m2·K/W. Flux crystallization appears to be the only significant effect of flux composition. The one glassy flux tested had much greater thermal conductivities, presumably due to radiation transport. Temperature and gap thickness had a negligible effect on the properties. These properties depend on the model used to extract them. They are being implemented into a mathematical model to simulate heat transfer in the mold, interface, and solidifying shell of a continuous slab-casting machine. |
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