Back
 JFCMV  Vol.4 No.3 , July 2016
Heat Transfer during Spray Cooling of Flat Surfaces with Water at Large Reynolds Numbers
Milan Hnizdil1, Martin Chabicovsky1, Miroslav Raudensky1, Tae-Woo Lee2*
Show more
Abstract: We present a new Nusselt number correlation for spray cooling at large Reynolds numbers and high surface temperatures for water sprays impinging perpendicularly onto a flat plate. A large set of experimental data on spray cooling of hot surfaces with water has been analyzed, including the water temperature effects. For large-scale cooling, such as in industrial processes, large number of injection parameters such as number, type, pressure, and angle of the spray injection has led to a multitude of correlations that are difficult for general and practical applications. However, by synthesizing a set of experimental data where all of the above parameters have been varied, we find that the Nusselt number and therefore the heat transfer coefficient can be cast accurately as a function of the Reynolds number. Water is widely used as the coolant during spray cooling, and has a specific phase change characteristic. At large Reynolds number (Re > 100,000) and surface temperature (Ts > 600°C) ranges, which are of interest in large-scale spray cooling, the effect of water temperature is quite significant as it affects the film boiling close to the surface. This effect also has been parameterized using experimental data.
Keywords: Impinging Flow, Spray Cooling, Heat Transfer, Measurements
Cite this paper: Hnizdil, M. , Chabicovsky, M. , Raudensky, M. and Lee, T. (2016) Heat Transfer during Spray Cooling of Flat Surfaces with Water at Large Reynolds Numbers. Journal of Flow Control, Measurement & Visualization, 4, 104-113. doi: 10.4236/jfcmv.2016.43010.
References

[1]   Kim, J. (2007) Spray Cooling Heat Transfer: The State of the Art. International Journal of Heat and Fluid Flow, 28, 753-767. http://dx.doi.org/10.1016/j.ijheatfluidflow.2006.09.003

[2]   Webb, B.W. and Ma, C.F. (1995) Single-Phase Liquid Jet Impingement Heat Transfer. Advances in Heat Transfer, 26, 105-217. http://dx.doi.org/10.1016/S0065-2717(08)70296-X

[3]   Yao, S.C. and Cox, T.L. (2002) A General Heat Transfer Correlation for Impacting Water Sprays on High-Tempera- ture Surfaces. Experimental Heat Transfer, 15, 207-219.
http://dx.doi.org/10.1080/08916150290082649

[4]   Wendelstorf, J., Spitzer, K.H. and Wendelstorf, R. (2008) Spray Water Cooling Heat Transfer at High Temperatures and Liquid Mass Fluxes. International Journal of Heat and Mass Transfer, 51, 4902-4910. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2008.01.032

[5]   Horsky, J., Raudensky, M. and Tseng, A.A. (2005) Heat Transfer Study of Secondary Cooling in Continuous Casting. AISTech 2005—Iron and Steel Technology Conference Proceedings, 2, 141-148.

[6]   Raudensky, M. and Horsky, J. (2005) Secondary Cooling in Continuous Casting and Leidenfrost Temperature Effects. Ironmaking and Steelmaking, 32, 159-164.
http://dx.doi.org/10.1179/174328105X15913

[7]   Jacobi, H., Kaestle, G. and Wunnenberg, K. (1984) Heat Transfer in Cyclic Secondary Cooling during Solidification of Steel. Ironmaking & Steelmaking, 11, 132-145.

[8]   Triolet, N., Poelmans, K., Mabelly, P. and Le Papillon, Y. (2009) Prevention of Corner Cracks in Slab Continuous Casting, Revue de Metallurgie. Cahiers D’Informations Techniques, 106, 508-517.

[9]   Zou, J. and Tseng, A.A. (1992) Microscopic Modeling of Fundamental Phase Transformation in Continuous Casting of Steel. Metallurgical and Materials Transactions A, 23A, 457-467.
http://dx.doi.org/10.1007/BF02801163

[10]   Nozaki, T., Matsuno, J. and Murata, K. (1978) Secondary Cooling Pattern for Preventing Surface Cracks of Continuous Casting Slab. Transactions of the Iron and Steel Institute of Japan, 18, 330-338.

[11]   Ueta, H., Saito, T., Kimura, M., Kimura, T., Mine, T. and Nakata, H. (1990) Development of Uniform Secondary Mist Cooling Technology for Slab Continuous Casting. Revue de Métallurgie (Paris), 87, 573-580.

[12]   Chaudhuri, S., Singh, R.K., Patwari, P., Majumdar, S., Ray, A.K., Singh, A.K.P. and Neogi, N. (2010) Design and Implementation of an Automated Secondary Cooling System for the Continuous Casting of Billets. ISA Transactions, 49, 121-129. http://dx.doi.org/10.1016/j.isatra.2009.09.005

[13]   Boyle, R. and Frick, J.W. (2005) Audits of Secondary Cooling Systems in Existing Casters as a Method to Enhance Product Quality and Productivity. Iron & Steel Technology, 3, 59-66.

[14]   de Oliveira, M., Ward, J., Garwood, D.R. and Wallis, R.A. (2002) Quenching of Aerospace Forgings from High Temperatures Using Air-Assisted, Atomized Water Sprays. Journal of Materials Engineering and Performance, 11, 80-85. http://dx.doi.org/10.1007/s11665-002-0012-4

[15]   Liu, X., Lienhard, J.H. and Lombara, J.S. (1991) Convection Heat Transfer by Impingement of Circular Liquid Jets. Journal of Heat Transfer, 113, 571-582. http://dx.doi.org/10.1115/1.2910604

[16]   de Toledo, G.A., Lainez, J. and Cirion, J.C. (1993) Model Optimization of Continuous Casting Steel Secondary Cooling. Materials Science and Engineering, A173, 287-291.
http://dx.doi.org/10.1016/0921-5093(93)90230-C

[17]   Santos, C., Cheung, N., Garcia, A. and Spin, J.A. (2005) Application of a Solidification Mathematical Model and a Genetic Algorithm in the Optimization of Strand Thermal Profile along the Continuous Casting of Steel. Materials & Manufacturing Processes, 20, 421-434. http://dx.doi.org/10.1081/AMP-200053451

[18]   Muller, H. and Jeschar, R. (1973) Investigation of Heat Transfer in a Simulated Secondary Cooling Zone in the Continuous Casting Process. Archiv fuer das Eisenhuettenwesen, 44, 589-594.

[19]   Zhang, J., Chen, D., Wang, S. and Long, M. (2011) Compensation Control Model of Superheat and Cool Water Temperature for Secondary Cooling of Continuous Casting. Steel Research International, 82, 213-221. http://dx.doi.org/10.1002/srin.201000148

[20]   Lechler Inc., Spray Nozzles for Secondary Cooling in Continuous Casting Machine, Stuttgart, Germany. www.lechlerusa.com

 
 
Top