Experimental research on spray characteristics and heat transfer of cast-rolled strip subjected to impinging air-atomized cooling

Abstract

Experiments on flow field and heat transfer were carried out to quantitatively analyse the performance of an air-atomized cooling nozzle. A heat transfer platform and a particle image velocimetry system were applied to study the spray characteristics of the nozzle. The effects of water pressure and air pressure on flow rate, spray angle, water flow density and droplets velocity were investigated. The surface heat transfer coefficient (SHTC) was calculated with an inverse heat transfer method based on the instantaneous plate temperature tested by thermocouples. The effects of water pressure, air pressure, jet (nozzle) height, jet (nozzle) spacing and plate temperature on heat transfer of impinging air-atomized cooling were investigated. The experimental research in this paper provides valuable basic reference data for impinging jet cooling. It is of great significance on how to reveal the flow field law of the air-atomized spray nozzle and achieve the best cooling effect.

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References

Mezhericher

Ladizhensky

Etlin

Atomization of liquids by disintegrating thin liquid films using gas jets. Int J Multiphase Flow. 2017;88:99–115. doi: 10.1016/j.ijmultiphaseflow.2016.07.015

Yarin

AL.

Drop impact dynamics: splashing, spreading, receding, bouncing … . Annu Rev Fluid Mech. 2006;38:159–192. doi: 10.1146/annurev.fluid.38.050304.092144

Shafaee

Mahmoudzadeh

Numerical investigation of spray characteristics of an air-blast atomizer with dynamic mesh. Aerosp Sci Technol. 2017;70:351–358. doi: 10.1016/j.ast.2017.08.024

Gad

Ibrahim

Abdel-baky

et al. Experimental study of diesel fuel atomization performance of air blast atomizer. Exp Therm Fluid Sci. 2018;99:211–218. doi: 10.1016/j.expthermflusci.2018.07.006

Pizziol

Costa

Panão

et al. Multiple impinging jet air-assisted atomization. Exp Therm Fluid Sci. 2018;96:303–310. doi: 10.1016/j.expthermflusci.2018.03.019

Wang

Zhang

Liu

RH.

Influence of air supply pressure on atomization characteristics and dust-suppression efficiency of internal-mixing air-assisted atomizing nozzle. Powder Technol. 2019;355:393–407. doi: 10.1016/j.powtec.2019.07.040

Pasandideh-Fard

Aziz

Chandra

et al. Cooling effectiveness of a water drop impinging on a hot surface. Int J Heat Fluid Flow. 2001;22(2):201–210. doi: 10.1016/S0142-727X(00)00086-2

Hernández

Acosta

FAG

Castillejos

AHE

et al. The fluid dynamics of secondary cooling air-mist jets. Metall Mater Trans B. 2008;3(5):746–763. doi: 10.1007/s11663-008-9179-x

Cheng

Liu

Zhao

et al. Experimental investigation of parameters effect on heat transfer of spray cooling. Heat Mass Transfer. 2010;46(8-9):911–921. doi: 10.1007/s00231-010-0631-5

10.

Cheng

Han

Liu

et al. Spray characteristics and spray cooling heat transfer in the non-boiling regime. Energy. 2011;36:3399–3405. doi: 10.1016/j.energy.2011.03.039

11.

Zhang

Wen

Dou

et al. Experimental study of the air-atomized spray cooling of high-temperature metal. Appl Therm Eng. 2014;71(1):43–55. doi: 10.1016/j.applthermaleng.2014.06.026

12.

Zhou

Chen

Cao

et al. Experimental investigation on the performance of a water spray cooling system. Appl Therm Eng. 2017;112:1117–1128. doi: 10.1016/j.applthermaleng.2016.10.191

13.

Chakraborty

Sarkar

Roshan

et al. Spray cooling of hot steel plate using aqueous solution of surfactant and polymer. Thermal Science and Engineering Progress. 2019;10:217–231. doi: 10.1016/j.tsep.2019.02.003

14.

Breitenbach

Roisman

Tropea

Heat transfer in the film boiling regime: single drop impact and spray cooling. Int J Heat Mass Transf. 2017;110:34–42. doi: 10.1016/j.ijheatmasstransfer.2017.03.004

15.

Wang

Deng

et al. The influence of spray inclination angle on the ultra fast cooling of steel plate in spray cooling condition. Appl Therm Eng. 2015;78:500–506. doi: 10.1016/j.applthermaleng.2014.12.033

16.

Panda

Pati

Pradhan

et al. High mass flux air atomized spray with subcooled water: a novel methodology to enhance the heat transfer rate in film boiling regime. Int J Heat Mass Transf. 2018;120:1287–1304. doi: 10.1016/j.ijheatmasstransfer.2017.12.051

17.

Lin

Zhou

Fang

et al. Heat transfer performance and optimization of a close-loop R410A flash evaporation spray cooling. Appl Therm Eng. 2019;159:113966. doi: 10.1016/j.applthermaleng.2019.113966

18.

Jiang

Cheng

et al. Experimental study on heat transfer performance of a novel compact spray cooling module. Appl Therm Eng. 2019;154:150–156. doi: 10.1016/j.applthermaleng.2019.03.078

19.

Cuijiao

Ruifeng

Chao

et al. Experimental measurement of air impinging heat transfer coefficient based on 2-D transient inverse heat conduction method. Energy Metall Ind. 2017;36(1):28–33.

20.

Colaço

Orlande

HRB

Dulikravich

GS.

Inverse and optimization problems in heat transfer. J Braz Soc Mech Sci Eng. 2006;XXVIII(1):18–24.