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Research on the heat transfer characteristics of air-atomized water spray cooling by experiment and inverse heat conduction method

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Abstract

The heat transfer characteristics of air-atomized water spray cooling on the hot metallic surface are presented and discussed in this paper. The controlling parameters mainly investigated are air pressure and spray height. The effects of these parameters on the important thermal characteristics such as interfacial heat transfer coefficient, cooling rate, and wetting layer evolution attained by experiment and inverse heat conduction method. The value of interfacial heat transfer coefficient is proportional to the air pressure and inversely proportional to the spray height. As the air pressure is 0.2 MPa, and the spray height is 40 mm, the maximum cooling rate is 85.08 ℃/s. There is no film boiling stage under this condition. At the spray height is 80 mm, and air pressure is 0.3 MPa, the maximum cooling rate is 62.6 ℃/s. In addition, transition boiling and nucleate boiling always exist, but their retention time is different under different conditions. The temperature-dependent interfacial heat transfer mechanism of air-atomized water spray cooling is explored according to the thermal characteristics and photographs taken by the high-speed camera. The results show that air pressure and spray height both have an influence on the interfacial heat transfer.

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Abbreviations

T :

Temperature (℃)

ρ :

Density (kg/m3)

cρ :

Specific heat capacity (J/(kg °C))

λ:

Thermal conductivity (W/(m°C))

t :

Time (s)

z :

The coordinate along the axial direction of the sample

q :

Surface heat flux (W/m2)

H :

Interfacial heat transfer coefficient (W/(m2·℃))

T f :

The temperature of air-atomized water spraying (°C)

IHTC:

Interfacial heat transfer coefficient

HTC:

Heat transfer coefficient

IHCM:

Inverse heat conduction method

IHTC:

Temperature-dependent interfacial heat transfer coefficient

LFP:

Leidenfrost Point

CHF:

Critical heat flux

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (51575324, 52005304), Natural Science Foundation of Shandong Province (2019GGX104009).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shandong University of Science and Technology, 579 Qianwangang Road, Qingdao, Shandong, 266510, PR China

    Lidan Ning, Shuncun Luo, Zhichao Li, Lianfang He & Huiping Li

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  1. Lidan Ning
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Correspondence to Huiping Li.

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Ning, L., Luo, S., Li, Z. et al. Research on the heat transfer characteristics of air-atomized water spray cooling by experiment and inverse heat conduction method. Heat Mass Transfer 58, 1247–1262 (2022). https://doi.org/10.1007/s00231-021-03172-0

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  • DOI: https://doi.org/10.1007/s00231-021-03172-0

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