Analysis on the Influencing Factors of Heat Transfer for the Slot Nozzle Convection Impact in Rolled Strip Preposition Ultra-Fast Cooling

Abstract:

The aim of this work is to optimize process design parameters of the hot rolling steel strip preposition ultra-fast cooling (UFC) system, and improve the stability and uniformity of micro heat transfer during the high strength cooling process of hot rolling strip. According to the technology and equipment feature of the pre-UFC system for a factory, the convective heat transfer process of single nozzle and strip in UFC system was studied numerically by the fluid-structure interaction finite element method (FEM). The influence of different parameters on the slot impinging jet heat transfer coefficient was obtained, such as jet angle, the jet velocity, the slot nozzle width and water temperature. The results show that on the ultra-fast cooling process of the strip in the initial temperature of 850 °C and thickness of 8 mm, the global average heat transfer coefficient can be increased with the increase of jet velocity, and decrease of the cooling water temperature. The jet angle and the slot nozzle width have minimal effect on it for the whole heat transfer zone. The local average heat transfer coefficient first increased and then decreased with the increase of jet angle and slot nozzle width at the jet impingement location.

• Periodical: Materials Science Forum (Volume 817)
• Pages: 198-203
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.817.198
• Online since: April 2015
• Authors: Jian Hui Shi*, Guo Yuan, Lian Yun Jiang, Kun Zhao, Guo Dong Wang
• Keywords: Heat Transfer Coefficient, Rolled Strip, Slot Nozzle, Ultra-Fast Cooling

References

[1] Wang Guo-dong, The new generation TMCP with the key technology of the ultra-fast cooling, Shanghai Metals. 30(2008) 1-4.

[2] Hiroshi Kagechika, Production and technology of iron and steel in Japan during 2005. ISIJ International. 46(2006) 939-958.

DOI: 10.2355/isijinternational.46.939

[3] Simon P, Fishbach J. P, Riche P, Ultra-fast cooling on the run-out table of the hot strip mill, Revue de Metallurgie. 93(1996) 409-415.

[4] A. Lucas, P. Simon, G. Bourdon, J.C. Herman, Metallurgical aspects of ultra-fast cooling in front of the down-coiler, Steel Research. 75(2004) 139-146.

DOI: 10.1002/srin.200405939

[5] Fujibayashi A, Omata K, JFE steel's advanced manufacturing technologies for high performance steel plates, JFE Technical Report. 5(2005) 10.

[6] Wang Guo-dong, New generation TMCP and innovative hot Rolling process, Journal of Northeastern University: Natural Science. 30(2009) 913-922.

[7] D.A. Zumbrunnem, F.P. Incropera, R. Viskanta, A laminar boundary layer model of heat transfer due to a nonuniform planar jet impinging on a moving plate, Warm-und Stoffubertragung. 27(1992) 311-319.

DOI: 10.1007/bf01589969

[8] Y. Shi, M. Ray, A. Mujumdar, Computational study of impingement heat transfer under a turbulent slot jet, Ind. Eng. Chem. Res. 41(2002) 4643-4651.

DOI: 10.1021/ie020120a

[9] Tong A. Y, On the impingement heat transfer from an oblique free surface plan jet, Int J Heat Mass Transfer. 46 (2003) (2077).

DOI: 10.1016/s0017-9310(02)00505-7

[10] D. Sahoo, M. Sharif, Numerical modeling of slot-jet impingement cooling of a constant heat flux surface confined by a parallel wall, Int. J. Therm. Sci. 43(2004) 877-887.

DOI: 10.1016/j.ijthermalsci.2004.01.004

[11] YIN Zhao-qin, ZHANG Hong-jun, LIN Jian-zhong, Experimental study on the flow field characteristics in the mixing region of twin jets, Journal of Hydrodynamics. 19(2007) 309-313.

DOI: 10.1016/s1001-6058(07)60063-8

[12] Miao Jr-ming, Wu Chen-yuan, Chen Ping-hei, Numerical investigation of confined multiple-jet impingement cooling over a flat plate at different crossflow orientaions, Numerical Heat Transfer. 55(2009) 1019-1050.

DOI: 10.1080/10407780903014335

[13] Andreini Antonio, Da Soghe Riccardo, Facchini Bruno, Experimental and numerical analysis of multiple impingement jet arrays for an active clearance control system, Journal of Turbomachinery, 135 (2013) 031016.

DOI: 10.1115/1.4007481

[14] P.R. Parida, S.V. Ekkad, K. Ngo, Experimental and numerical investigation of confined oblique impingement configurations for high heat flux applications, Int. J. Therm. Sci. 50(2011) 1037-1050.

DOI: 10.1016/j.ijthermalsci.2011.01.010

[15] Gulati Puneet, Katti Vadiraj, Prabhu S. V, Influence of the shape of the nozzle on local heat transfer distribution between smooth flat surface and impinging air jet, International Journal of Thermal Sciences. 48(2009) 602-617.

DOI: 10.1016/j.ijthermalsci.2008.05.002

[16] C. Nuntadusit, M. Wae-hayee, A. Bunyajitradulya, Heat transfer enhancement by multiple swirling impinging jets with twisted-tape swirl generators, International Communications in Heat and Mass Transfer, 39(2012) 102-107.

DOI: 10.1016/j.icheatmasstransfer.2011.10.003

[17] Benmouhoub Dahbia, Mataoui Amina, urbulent heat transfer from a slot jet impinging on a flat plate , Journal of Heat Transfer. 135 (2013) 102201: 1-9.

DOI: 10.1115/1.4024554