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http://dx.doi.org/10.3795/KSME-B.2003.27.8.1105

Analysis of a Vortex Structure Near the Strip Edge for Preventing Edge Zn Overcoation  

Cho, Choong-Won (한국과학기술원 기계공학과)
Kim, Sang-Joon (포항산업과학연구원 설비.자동화연구센터)
Ahn, Gi-Jang (한국과학기술원 기계공학과)
Chung, Myung-Kyoon (한국과학기술원 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.27, no.8, 2003 , pp. 1105-1113 More about this Journal
Abstract
In the gas wiping process of continuous hot-dip galvanizing, edge overcoating develops near the edge of the steel strip. The overcoating is supposed to occur due to the reduced impact pressure of wiping gas on the strip surface. The purpose of this study is to investigate the effect of edge vortex on the reduced impact pressure. Three-dimensional unsteady flows are simulated using a commercial code, STAR-CD. Standard k-$\varepsilon$ model is used as a turbulence model. It is found that an alternating vortex structure in the vicinity of strip edge is developed by buckling of opposed jet streams and that the reduced amount of impact pressure at strip edge becomes smaller as the air knife gets closer to the strip. The effect of edge baffle on the reduced impact pressure is also investigated.
Keywords
Edge Overcoating; Edge Baffle; Air Knife; Strip Edge Vortex; Continuous Hot-Dip Galvanizing;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Ellen, C. H. and Tu, C. V., 1984, 'An Analysis of Jet Stripping of Liquid Coating,' J. Fluids Engineering, Vol. 106, pp. 399-404   DOI
2 Yoo, S. R., Choi, I. S., Nam, P. K., Kim, J. K., Kim, S. J. and Davene, J., 1999, 'Coating Deviation Control in Transverse Direction for a Continuous Galvanizing Line,' IEEE Transactions on Control Systems Technology, Vol. 7, pp. 129-135   DOI   ScienceOn
3 Takeishi, Y. and Morino, H., 2000, 'Mechanism and Prevention of Edge Over Coating in Continuous Hot-Dip Galvanizing,' ISIJ International, Vol. 40, No. 11, pp. 1127-1133   DOI
4 Kwon, Y. P., 1998, 'Instability of High-Speed Impinging Jets (1),' Trans. of KSME (B), Vol. 22, No. 4, pp. 452-458   과학기술학회마을
5 Zhao, Y. and Brodkey, R. S., 1998, 'Averaged and Time-Resolved Full-Field (Three -Dimensional), Measurements of Unsteady Opposed Jets,' The Canadian Journal of Chemical Engineering, Vol. 76, pp. 536-545   DOI
6 Park, J. R., Jeon, S. H. and Park, R. B., 1999, 'Edge Overcoating and Buildup of Continuously Hot-Dip Metallized Strip,' Journal of the Korea I Institute of Surface Engineering, Vol. 32, No. 4, pp. 555-560   과학기술학회마을
7 Honami, S., Shizawa, T., Sato, A. and Ogata, H., 1996, 'Flow Behavior with and Oscillating Motion of the Impinging Jet in a Dump Diffuser Combustor,' Journal of Engineering for Gas Turbines and Power, Vol. 118, pp. 65-71   DOI