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A study of heat transfer through the heavy plate thickness under multi-slit jet impingement

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Abstract

The influence of cooling models and moving velocity on the temperature variation and cooling rate through the thickness of a metal plate is experimentally investigated. In this investigation, the cooling process is divided into four stages: a starting stage (I), a rapid cooling stage (II), a slow cooling stage (III) and a stopping stage (IV). Based on the curves, cooling rate, temperature difference, the heat transfer coefficient and center temperature curves are discussed. The results indicate that the cooling model and moving velocity influence the heat transfer on the surface, and affects the cooling rate through the thickness by changing the temperature difference. When the flow rates of nozzles 1, 2 and 3 are set to be V1, V2 and V3 respectively, the highest heat transfer is observed when V1 > V2 > V3. Under this cooling model, the maximum temperature difference occurs at the time of transition from the rapid cooling stage (II) to the slow cooling stage (III). In the slow cooling stage (III), increased moving velocity improves the synchronization of the heat transfer and decreases the maximum heat flux. As well, the speed of motion affects the internal heat conduction and cooling rate by affecting surface heat transfer.

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Abbreviations

a :

Thermal diffusivity (m2/s)

C :

Specific heat capacity (J/kg*K)

q :

Heat flux (MW/m2)

q max :

Maximum heat flux (MW/m2)

T :

Temperature (K)

r m :

Distance from impact line

r w :

Position of the wetting front the impinging line

u :

Steel moving speed(mm/s)

Ta :

Actual temperature

Tc :

Calculation temperature

τ :

The time (s)

H :

Thickness (mm)

Uo :

Initial jet velocity

q s :

Surface heat flux(MW/m2)

V :

Flow rate(L/min)

w :

Length of motion devise (mm)

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Acknowledgments

This research was jointly supported by the national natural science foundation of china (51404058), the fundamental research funds for the central universities (N150704005), and the open project of the RAL at northeastern university (2016006).

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Authors and Affiliations

  1. The State Key Laboratory of Rolling and Automation (RAL), Northeastern University, Shenyang, 110819, China

    Bingxing Wang, Yue Xia, Zhixue Liu, Zhaodong Wang & Guodong Wang

Authors
  1. Bingxing Wang
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  2. Yue Xia
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  3. Zhixue Liu
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  4. Zhaodong Wang
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  5. Guodong Wang
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Correspondence to Yue Xia.

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Wang, B., Xia, Y., Liu, Z. et al. A study of heat transfer through the heavy plate thickness under multi-slit jet impingement. Heat Mass Transfer 56, 663–670 (2020). https://doi.org/10.1007/s00231-019-02738-3

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  • DOI: https://doi.org/10.1007/s00231-019-02738-3

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