Study of Flow Characteristics of Tundish Based on Digital Image Velocimetry Technique
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IN continuous casting processes, the tundish not only serves as an intermediate buffer, but also acts as a useful reactor for liquid steel refining. Modern tundishes are now designed to conduct different metallurgical operations, such as inclusion separation and flotation, C alloy trimming, calcium-doped inclusion modification, and thermal homogenization. To carry out such operations effectively, fluid flow plays an important role in the tundish.[1] It is now a proven fact that the insertion of different types of flow modifying devices can alter flow patterns within the tundish and then affect the performance of the tundish.[2] The molten steel temperature in a tundish has a strong influence on the quality and properties of cast product, caster operation, and refractory life. Control of melt temperature in a very narrow range is beneficial for improving the quality of the product. With plasma or induction heating, the liquid steel temperature can be maintained within a very
JUN HUANG, Ph.D. Candidate, is with the School of Metallurgy, Northeastern University, Shenyang 110819, P.R. China, and also with the Key Laboratory of Integrated Exploitation of Bayan Obo Multimetal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, P.R. China. Contact e-mail: hjun8420@imust. edu.cn YONGJIE ZHANG, Professor, is with Baosteel Research Institute, Shanghai, 201900, P.R. China. YAZHU ZHANG, Associate Professor, is with the School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, P.R. China. YAKUN ZHANG and XIN YE, Master Candidates, and BAOFENG WANG, Professor, are with the School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, P.R. China. Manuscript submitted December 5, 2015. Article published online July 20, 2016. 3144—VOLUME 47B, OCTOBER 2016
narrow range, which is beneficial to the continuous casting and production of a high quality of steel.[3] Physical and mathematical modeling of fluid flow phenomena play an important role in the studies of steel quality associated with various steps in steelmaking and steel processing operations.[4] These two approaches are complementary, although computer modeling is becoming more attractive due to the availability of relatively inexpensive computers and software packages; it is not practical to model everything mathematically.[5] Hydraulic simulation experiments have proved that it is the most intuitive, convenient method to study continuous casting processes for optimizing tundish design and operations. Hydraulics simulation is established by the similarity principle. It overcomes the difficulties in research metallurgy due to the complexity of the metallurgical process and high temperature, opaque, and absence of test means. The use of display agent flow visualization technology can bring some properties of visual representation in order to obtain a comprehensive understanding of flow. Staining solution (methylene blue), Potassium permanganate, and food pigment to aid in display in
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