JPEE  Vol.2 No.4 , April 2014
Ultra Fast Spray Cooling and Critical Droplet Daimeter Estimation from Cooling Rate
Abstract: Spray cooling is an effective tool to dissipate high heat fluxes from hot surfaces. This paper thoroughly investigates the effects of spray parameters on the cooling time and cooling rate under varying inlet pressure using water as the coolant. Cylindrical samples of stainless steel with constant diameter, D = 25 mm, and thickness δ: 8.5 mm, 13 mm, 17.5 mm and 22 mm were investigated. Critical droplet diameter to achieve an ultrafast cooling rate of 300°C/s was estimated by using analytical model for samples of varying thickness. At an inlet pressure of 0.8 MPa, maximum cooling rates of 424.2°C/s, 502.81°C/s and 573.1°C/s were achieved for wall super heat ΔT = 600°C, 700°C and 800°C respectively.
Cite this paper: Aamir, M. , Qiang, L. , Xun, Z. , Hong, W. and Zubair, M. (2014) Ultra Fast Spray Cooling and Critical Droplet Daimeter Estimation from Cooling Rate. Journal of Power and Energy Engineering, 2, 259-270. doi: 10.4236/jpee.2014.24037.

[1]   Bhattacharya, P., Samanta, A.N. and Chakraborty, S. (2009) Spray Evaporative Cooling to Achieve Ultra-Fast Cooling in Run Out Table. International Journal of Thermal Sciences, 48, 1741-1747.

[2]   Selvam, R.P., Lin, L. and Ponnappan, R. (2006) Direct Simulation of Spray Cooling: Effect of Vapor Bubble Growth and Liquid Droplet Impact on Heat Transfer. International Journal of Heat and Mass Transfer, 49, 4265-4278.

[3]   Yang, J., Chow, L.C. and Paris, M.R. (1996) Nucleate Boiling Heat Transfer in Spray Cooling. Journal of Heat Transfer, 118, 668-671.

[4]   Lucas, A., Simon, P., Bourdon, G., Herman, J.C., Riche, P., Neutjens, J. and Harlet, P. (2004) Metallurgical Aspects of Ultra Fast Cooling in Front of the Down-Coiler. Steel Research, 75, 139-146.

[5]   Hatta, N. and Osakabe, H. (1989) Numerical Modeling for Cooling Process of a Moving Hot Plate by a Laminar Water Curtain. ISIJ International, 29, 919-925.

[6]   Ravikumar, S.V., Jha, J.M., Sarkar, I., Mohapatra, S.S., Pal, S.K. and Chakraborty, S. (2013) Achievement of Ultrafast Cooling Rate in a Hot Steel Plate by Air-Atomized Spray with Different Surfactant Additives. Experimental Thermal and Fluid Science, 50, 79-89.

[7]   Cox, S.D., Hardy, S.J. and Parker, D.J. (2001) Influence of Runout Table Operation Setup on Hot Strip Quality, Subject to Initial Strip Condition, Heat Transfer Issues. Iron Making & Steel Making, 28, 363-372.

[8]   Han, B., Liu, X.H., Wang, G.D. and She, G.F. (2005) Development of Cooling Process Control Technique in Hot Strip Mill. Journal of Iron and Steel Research International, 12, 12-16.

[9]   Mohapatra, S.S., Ravikumar, S.V., Andhare, S., Chakraborty, S. and Pal, S.K. (2012) Experimental Study and Optimization of Air Atomized Spray with Surfactant Added Water to Produce High Cooling Rate. Journal of Enhanced Heat Transfer, 19, 397-408.

[10]   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.

[11]   Karwa, N., Gambaryan-Roisman, T., Stephan, P. and Tropea, C. (2011) A Hydrodynamic Model for Sub Cooled Liquid Jet Impingement at the Leiden Frost Condition. International Journal of Thermal Sciences, 50, 993-1000.

[12]   Hsieh, S.S., Fan, T.C. and Tsai, H.H. (2004) Spray Cooling Characteristics of Water and R-134a. Part I: Nucleate Boiling. International Journal of Heat and Mass Transfer, 47, 5703-5712.

[13]   Ciofalo, M., Caronia, A., Di Liberto, M. and Puleo, S. (2007) The Nukiyama Curve in Water Spray Cooling: Its Derivation from Temperature-Time Histories and Its Dependence on the Quantities That Characterize Drop Impact. International Journal of Heat and Mass Transfer, 50, 4948–4966.

[14]   Santangelo, P.E. (2010) Characterization of High-Pressure Water-Mist Sprays: Experimental Analysis of Droplet Size and Dispersion. Experimental Thermal and Fluid Science, 34, 1353-1366.

[15]   Biance, A.L., Clanet, C. and Quere, D. (2003) Leidenfrost Drops. Physics of Fluids, 15, 1632-1637.