THERMAL SCIENCE

International Scientific Journal

THE EFFECT OF WATER TEMPERATURE ON COOLING DURING HIGH PRESSURE WATER DESCALING

ABSTRACT
Production of hot rolled steel plates is connected with high temperatures at which steel reacts with oxygen in the atmosphere and oxide layers (scales) are formed on the surface. Scales affect the surface quality of the product and must be eliminated before the product enters any further rolling operations. The scales are usually removed by high pressure flat jet water nozzles in a process called hydraulic descaling. One side effect of this form of descaling is intense cooling of the product, which runs counter to the purpose of descaling. One way to decrease this effect is to use water at higher temperatures. Laboratory experiments were performed in order to determine the degree of influence of water temperature on the intensity of cooling. Temperature measurements were used as an input for inverse algorithm calculations and heat transfer coefficient determinations. The variables were computed as a function of time and position. The results were compared and significant decrease in the cooling intensity was observed. The findings are discussed in detail.
KEYWORDS
PAPER SUBMITTED: 2016-02-09
PAPER REVISED: 2017-07-14
PAPER ACCEPTED: 2017-07-29
PUBLISHED ONLINE: 2017-08-05
DOI REFERENCE: https://doi.org/10.2298/TSCI160209163P
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Issue 6, PAGES [2965 - 2971]
REFERENCES
  1. Hrabovský, J., Horský J., Numerical simulation of the high pressure hydraulic descaling, Proceedings Metal 2010. 19th International Metallurgical and Materials Conference, Rož ov pod Radhoš ěm, Cze h Republi , 2010, pp. 621-626
  2. Ko rbáček, P., et al., Optimization of working roll cooling in hot rolling, 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Associazione Italiana di metallurgia, Milano, Italy, 2013, pp. 1-11
  3. Pohanka, M., Two-dimensional correction of data measured using a large pressure sensor, Computational Methods and Experimental Measurements XI, Eleventh International Conference on Computational Methods and Experimental Measurements, London, UK, 2003, Vol. 4, pp. 587-595
  4. Hnízdil, M., Raudenský M., Descaling by pulsating water jet, Proceedings Metal 2010, 19th I er a io al Me allurgi al a d Ma erials Co fere e, Rož ov pod Radhoš ěm, Cze h Republi , 2010, pp. 209-213
  5. Frick, J. W., Enhanced Accuracy of Descaling Nozzle Arrangements With New, Complementary Measurement Methods, AISTech - Iron and Steel Technology Conference Proceedings, AISTech - The Iron & Steel Technology Conference and Exposition, Indianapolis, USA, 2014, Vol. 2, pp. 2025-2028
  6. Farrugia, D., et al., Advancement in understanding of descalability during high pressure descaling, Key Engineering Materials, 622-623 (2014), pp. 29-36, DOI: 10.4028/www.scientific.net/KEM.622-623.29
  7. Mangrulkar, C. K., et al., Experimental Investigation of Convective Heat Transfer Enhancement Using Alumina/Water and Cooper Oxide/Water Nanofluids, Thermal Science, 20 (2016), 5, pp. 1681-1692
  8. Hussein, A. M., et al., Heat Transfer Enhancement with Elliptical Tube Under Turbulent Flow TiO2-Water Nanofluid, Thermal Science, 20 (2016), 1, pp. 89-97
  9. Ge, M., Numerical Investigation of Flow Characteristics Over Dimpled Surface, Thermal Science, 20 (2016), 3, pp. 903-906
  10. Pohanka, M., Horský, J., Inverse algorithms for time dependent boundary reconstruction of multidimensional heat conduction model, Proceedings (Josef Leja), THERMOPHYSICS 2007, Kočov e, Slovakia, 2 7, pp. 14-23
  11. Bergman, T. L., et al., Fundamentals of heat and mass transfer (7th edition), John Wiley and Sons Inc., New York, USA, 2011
  12. He, Y., et al. A Novel Numerical Method for Heat Equation, Thermal Science, 20 (2016), 3, pp. 1018-1021
  13. Pohanka, M., Ko rbáček, P., Design of Cooling units for Heat Treatment, in: Heat Treatment - Conventional and Novel Applications (Dr. Frank Czerwinski), InTechOpen, Rijeka, Croatia, 2012, pp. 1-20, DOI: 10.5772/50492
  14. Gao P., Study of Convective Heat Transfer Coefficient of High Pressure Water Descaling, Applied Mechanics and Materials, 599-601 (2014), pp. 1976-1980, DOI: 10.4028/www.scientific.net/AMM.599-601.1976
  15. Čarnogurská, M., et al., Thermal effects of a high-pressure spray descaling process, Materiali in tehnologije = Materials and technology, 48 (2014), 3, pp. 389-394
  16. Choi, J. W, Choi, J.W., Convective Heat Transfer Coefficient for High Pressure Water Jet, ISIJ International, 42 (2002), 3, pp. 283-289, DOI: 10.2355/isijinternational.42.283

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence