Numerical study of droplet dynamics impinging onto steel plate covered with scale layer

Jan BOHÁČEK, Aleš HORÁK

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PDF(567 KB)
Front. Mech. Eng. ›› 2010, Vol. 5 ›› Issue (4) : 389-398. DOI: 10.1007/s11465-010-0108-8
RESEARCH ARTICLE

Numerical study of droplet dynamics impinging onto steel plate covered with scale layer

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Abstract

The steel hot rolling process is inseparably connected to an oxide layer called “scale” at high temperatures. Hydraulic descaling of rolled material is a part of all rolling trains. Surface quality after descaling is fundamental for the final surface quality of a rolled product. The process itself is not theoretically well described; various different approaches have been used to clarify the descaling problem. This paper describes the dynamics of high-speed impact between the compressible water droplet and the steel scale layer. The phenomenon is known as water hammer effect. The purpose of this study is to numerically verify the fact that impact stress can be a significant factor during the descaling process. Considering a high droplet impact speed (100–300 ms-1), inferential extremely short time interval (0.1–5 µs) peaks in impact pressure reaching 300 MPa can be found. Droplet dynamics was simulated with the help of LS-Dyna solver, whereas the stress analysis was performed in ANSYS interface. The extreme pressure peaks of very short duration in an impact area are a new phenomenon in the descaling theory.

Keywords

hydraulic descaling / scale / rolling / water-hammer / descaling theory

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Jan BOHÁČEK, Aleš HORÁK. Numerical study of droplet dynamics impinging onto steel plate covered with scale layer. Front Mech Eng Chin, 2010, 5(4): 389‒398 https://doi.org/10.1007/s11465-010-0108-8

References

[1]
Blazevic D T. Newton and descaling—Data and conclusions. In: Proceedings of the 3rd International Conference on Hydraulic Descaling, London, UK, 2000, 3–13
[2]
Bendig L, Raudensky M, Horsky J. Descaling with high pressure nozzles. In: Proceedings of ILASS-Europe, Zurich, 2001, 1–7
[3]
Raudensky M, Horsky J, Pohanka M, Tosovsky J, Kotrbacek P. Experimental study of parameters influencing efficiency of hydraulic descaling—Theory of vapour explosion. In: Proceeding of the 4th Conference on Hydraulic Descaling, London, 2003, 29–40
[4]
Foldyna J, Sitek L, Svehla B, Svehla S. Utilization of ultrasound to enhance high-speed water jet effects. Ultrasonics Sonochemistry, 2004, 11(3–4): 131–137
CrossRef Google scholar
[5]
Smith D G, Kinslow R. Pressure due to high-velocity impact of a water jet. Experimental Mechanics, 1976, 16(1): 21–25
CrossRef Google scholar
[6]
Huang Y C, Hammit F G. Numerical studies of unsteady, two-dimensional liquid impact phenomena. <patent>Report No. UMICH 03371–8-T</patent>, 1971
[7]
Heyman F J. On the shock wave velocity and impact pressure in high-speed liquid-solid impact. Journal of Basic Engineering, 1968, 90: 400–402
[8]
Obara T, Field J E. Liquid-jet impact on liquid and solid surface. Wear, 1995, 186–187: 388–394
[9]
Heymann F J. High-speed impact between a liquid drop and a solid surface. Journal of Applied Physics, 1969, 40(13): 5113– 5123
CrossRef Google scholar
[10]
de Haller. Research on corrosion due to cavitation. Journal of Civil Engineering, 1933, 101(21–22): 243–260
[11]
Brunton J H. Deformation of solids by impact of liquids at high speeds. ASTM STP, 1961, 307: 83–98
[12]
Rajesh N. A novel approach for modelling of water jet peening. International Journal of Machine Tools & Manufacture, 2004, 44(7–8): 855–863
CrossRef Google scholar
[13]
Oka Y I, Mihara S, Miyata H. Effective parameters for erosion caused by water droplet impingement and applications to surface treatment technology. Wear, 2007, 263(1–6): 386–394
[14]
Adler W F. Water drop impact modelling. Wear, 1995, 186–187: 341–351
[15]
Jackson M J, Field J E. Liquid impact erosion of single-crystal magnesium oxide. Wear, 1999, 233–235: 39–50
[16]
Huang Y C, Hammit F G. Numerical studies of unsteady, two-dimensional liquid impact phenomena. <patent>Report No. UMICH 03371–8-T</patent>, 1971
[17]
Huang Y C, Hammitt F G, Yang W J. Mathematical modelling of normal impact between a finite cylindrical liquid jet and non-slip, flat rigid surface. In: Proceedings of the 1st International Symposium on Jet Cutting Technology, British Hydrodynamics Research Association, 1972, 57–68
[18]
Raudensky M, Horak A, Horsky J, Pohanka M, Kotrbacek P. Hydraulic descaling improvement—Findings of jet structure on water hammer effect. In: Proceedings of ATS–JSI conference, Paris, 2006, 34–35
[19]
Horak A, Bohacek J. High-speed droplet impact during hydraulic descaling process. In: Proceedings of Engineering Mechanics Conference, Svratka, 2007, 85–86

Acknowledgments

This investigation was supported by the Czech Science Foundation (No. 106/06/0709).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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