Computational and Experimental Study of the Transient Transport Phenomena in a Full-Scale Twin-Roll Continuous Casting M
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fluid flow in the industrial flow applications is essential for developing an accurate, overall picture of the quality variation, and this is particularly true in the continuous casting process where turbulent mixing is responsible for the heat transfer and is of great importance to the quality of the final product. In twin-roll continuous casting process, molten metal is fed through a delivery system into the pool region formed by walls of two side dams and two contra-rotating rolls, and the input stream energy per unit pool volume is around five to ten times greater than that in slab continuous casting processes.[1] In addition, as a roll-rotating-driven process,[2] turbulent flow in the wedge-shaped pool region is also strongly influenced by the motion of rolls. Moreover, Miyazawa and Szekely[3] pointed out that in twin-roll continuous casting process, for a given material, there exists only a narrow range of these parameters affording stable operation, and the high casting speed and rapid solidification demand an accurate control of any process MIANGUANG XU, formerly Ph.D. Candidate with the School of Materials and Metallurgy, Northeastern University, Shenyang 110819, People’s Republic of China, is now Postdoctoral Fellow with the Department of Mining and Materials Engineering, McGill University, Montreal, QC, Canada. ZHONGYANG LI, Master Student, ZHAOHUI WANG, Ph.D. Candidate, and MIAOYONG ZHU, Professor, are with School of Materials and Metallurgy, Northeastern University. Contact e-mail: [email protected] Manuscript submitted September 7, 2015. METALLURGICAL AND MATERIALS TRANSACTIONS B
parameters.[4] Thus, optimizing the fluid flow in twinroll continuous casting is crucial.[5] Very unfortunately, although a number of studies have shed light on the important aspects of the transient turbulence fluctuations in other continuous casting processes, no publication can be found in twin-roll continuous casting process. In twin-roll continuous casting process, the backflow of the mushy zone forms the rolling region, which is a very inactive zone and strongly influences the flow field in the lower part of the pool region and results in buffer effect to the momentum boundary layer,[2,6] but steel engineers are still striving to learn what is happening in the pool region without the consideration of heat transfer, especially the transient fluid flow. At present, the Reynolds-averaged Navier–Stokes approaches show good results in conventional continuous casting techniques, but have difficulties in predicting the turbulent fluctuations because the turbulence model is not able to take complex vorticity motions into account. Experience shows that an unsteady approach such as large eddy simulation (LES) has major advantages in predicting the transient fluid flow.[7] Thus the present work applies LES computational model to analyze the transient fluid flow in the pool region. Considering that the water modeling experiment has achieved great recognition due to both water and molten steel having approximately the same kinematic viscosity, thus to val
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