Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Analysis of the Coupled Turbulent Flow and Macroscopic Solidification in Twin-Roll Continuous Casting Process

쌍롤식 연속주조공정에서의 난류유동 및 거시적응고 해석

  • Published : 2001.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

The transport phenomena in a wedge-shaped pool of twin-roll continuous caster are affected by the various operating parameters such as the melt-feed pattern, roll-gap thickness, melt-superheat, and casting speed. A computer program has been developed for analyzing the two-dimensional, steady conservation equations for transport phenomena during twin-roll continuous casting process in order to estimate the turbulent melt-flow, temperature fields, and solidification in the wedge-shaped pool. The turbulent characteristics of the melt-flow were considered using a low-Reynolds-number K-$\xi$ turbulence model. Based on the computer program, the effects of the different melt-feed patterns, roll-gap thicknesses, and superheats of melt on the variations of the velocity and temperature distributions, and the mushy solidification were examined. The results show that the liquidus line is located considerably at the upstream region, and in the lower region appear the well-mixed melt-flow and most widely developed mushy zone. Besides, the variation of melt-flow due to varying melt-feed patterns, affects mainly the liquidus line, and scarcely has effects on the solidus line in the outlet region.

Keywords

References

  1. Cygler, M. and Wolf, M., 1986, 'Continuous Strip and Thin Slab Casting of Steel,' Iron Steelmaker, Aug., pp. 27-33
  2. Teoh, L. L., 1988, 'Technological Developments in Continuous Thin Slab and Strip Casters,' Iron and Steel Engineering, p. 34
  3. Shibuya, K. and Ozawa, M., 1991, 'Review : Strip Casting Techniques for Steel,' ISIJ International, Vol. 31, No.7, pp. 661-668
  4. Shin, Y. K., Kang, T., Reynolds, T., and Wright, L., 1995, 'Development of Twin Roll Strip Caster for Sheet Steels,' Ironmaking and Steelmaking, Vol. 22, No. 1, pp. 35-44
  5. Saitoh, T., Hojo, H., Yaguchi, H., and Kang, C. G., 1989, 'Two-dimensional Method for Twin-Roll Continuous Casting,' Metall. Trans., Vol. 23B, pp. 381-390
  6. Seyedein, S. H. and Hasan, M., 1997, 'Numerical Investigation of Coupled Turbulent Flow, Heat Transfer, and Macroscopic Solidification in a Vertical Twin-Roll Thin-Strip Caster,' Numerical Heat Transfer, Part A, Vol. 32, pp. 221- 246 https://doi.org/10.1080/10407789708913889
  7. 하만영, 최봉석, 1999, '쌍롤 연속 주조에서의 난류운동, 온도 및 응고예측을 위한 연구,' 대한기계학회논문집 B, 제23권, 제1호, pp. 12-24
  8. 김용희, 이중의, 최주태, 오규환, 윤종규, 라형용, 1996, '경계밀착좌표계에 의한 쌍롤박판주조법에서의 용탕의 유동 및 열전달 해석,' 대한금속학회지, Vol. 34, No. 10, pp. 1353-1361
  9. Miyazawa, K. and Szekely, J., 1981, 'A Mathematical Model of the Splat Cooling Process Using the Twin-Roll Technique,' Metall. Trans., Vol. 12A, pp. 1047-1057 https://doi.org/10.1007/BF02643486
  10. Miyazawa, K., Mizoguchi, T., Nakamura, N., and Ohashi, T., 1988, 'The Formation of Thin Steel Strip in a Laboratory Scale Twin-Roll Casting,' in Sahai et al.(eds), Casting of Near Net Shape Products, Proc. Int. Symp., in Honolulu, Hawaii, pp. 629-643
  11. Mo, A. and Hoydal, S. H., 1993, 'Mathematical Modeling of Temperature, melt Flow, Deformation and Stress in Aluminum Twin Roll Casting,' in Piwonka, T. S., Voller, V., and Katgerman, L. (eds), Modeling of Casting, Welding and Advanced Solidification Processes VI, pp. 671-677, The Mineral, Metals and Material Society
  12. Ha, M. Y., Kim, K., Kim, K. C., and Lee, S. W., 1994, 'Transient Analysis of Thermo-Fluid Phenomena in Twin-Roll Continuous Casting,' Int. J. Heat Mass Transfer, Vol. 37, No. 14, pp. 2059-2068 https://doi.org/10.1016/0017-9310(94)90307-7
  13. 김영도, 강충길, 1994, '직접압연공정에 있어서 롤과 용탕을 연계한 유한요소 열전도해석,' 대한기계학회논문집 B, 제18권, 제4호, pp. 946-957
  14. Hwang, J. D., Lin, H. J., Hwang, W. S., and Hu, C. T., 1995, 'Numerical Simulation of Metal Flow and Heat Transfer during Twin Roll Casting,' ISIJ lnt., Vol. 35, No. 2, pp. 170-177
  15. Kang, C. G., Kim, Y. D., and Lee, S. W., 1996, 'A Solidification and Cooling Roll Deformation Analysis Considering Thermal Flow in Twin Roll Strip Continuous Casting Process,' in Matthys, E. F. and Trucker, W. G. (eds), Melt Spinning Strip Casting and Slab casting, TMS Annual Meeting in Anaheim, California, Feb. 4-8, pp. 65-87
  16. Voller, V. R., Prakash, C., 1987, 'A Fixed Grid Numerical Modeling Methodology for Convection-Diffusion Mushy Region Phase-Change Problems,' Int. J. Heat Mass Transfer, Vol. 30, No.8, pp. 1709-1719 https://doi.org/10.1016/0017-9310(87)90317-6
  17. Launder, B. E. and Sharma, B. I., 1974, 'Application of the Energy Dissipation Model of Turbulence to the Calculation of Flow near a Spinning Disc,' Lett. Heat Mass Transfer, Vol. 1, pp. 131-138 https://doi.org/10.1016/0094-4548(74)90150-7
  18. Lai, K. Y. M., Salcudean, M., Tanaka, S., and Guthrie, R. I. L., 1986, 'Mathematical Modeling of Flows in Large Tundish Systems in Steelmaking,' Metall. Trans. B, Vol. 17B, pp. 449-459 https://doi.org/10.1007/BF02670209
  19. Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, Hemisphere, Washington, D.C..
  20. Lally, B., Biegler, L., and Henein, H., 1990, 'Finite Difference Heat-Transfer Modeling for Continuous Casting,' Metall. Trans. B, Vol. 21B, pp. 761-770 https://doi.org/10.1007/BF02654255