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Subcooled boiling heat transfer characteristics of alcohol in micro-cylinder-groups

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Abstract

Subcooled boiling of alcohol flowing through micro-cylinder-groups with different heights in aligned arrangement was investigated. Meanwhile, the outlet temperature and Nusselt number of the working fluid were obtained when the heating power was 80 W, 60 W and 40 W respectively. Subcooled boiling is divided into two parts: the partially developed stage and fully developed stage. The result showed that the outlet temperature of the fully developed stage in subcooled boiling changed rarely as the Reynolds number decreased. At the same heating power, the heights of the micro-cylinders had little effects on the outlet temperature of working fluid in the fully developed stage. However, for the same height of micro-cylinder, the fully developed stage of subcooled boiling came earlier as the heating power increased. And the Nusselt number in the fully developed stage was greater than that in the partially developed stage. Based on the regression analysis of experimental data, a correlation formula of Nusselt number for subcooled boiling in micro-cylinder-groups was established and made comparison with existing correlation.

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Abbreviations

A :

Heat transfer area of micro-cylinder-groups, m2

d :

Diameter of micro-cylinder, m

H :

Height of micro-cylinder, m

H 1 :

Hypothetical height of micro-cylinder, m

L :

Width of experimental section, m

n :

Number of micro-cylinders

P :

Electric power, W

p :

Pressure, Pa

q :

Heat flux, W/m2

S L :

Cylinder longitudinal space, m

S T :

Cylinder transverse space, m

T :

Temperature at the bottom of the experimental section, °C

T e :

Ambient temperature, °C

T l :

Feature temperature of the working fluid, °C

T s :

Saturation temperature of the working fluid, °C

ΔTSub :

Undercooling, °C

Bo :

Boiling number

Ja :

Jacob number

Pr :

Prandtl number

ε :

Emissivity of copper

σ :

Constant of Stefan-Boltzmann, W/(m2·K4)

λ :

Thermal conductivity of copper, W/(m·K)

η f :

Fin efficiency

Φ cond :

Heat transferred from the heating section, W

l :

liquid

s :

Saturation state

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Acknowledgements

We would like to thank Z. G. Liu in Energy Research Institute of Shandong Academy Sciences for the assistance on experimental system and helpful advice. We acknowledge funding supports from the National Natural Science Foundation of China (Grant No. 51876223), and the Fundamental Research Funds for the Central Universities (Grant No. 18CX06035A).

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Authors and Affiliations

  1. Energy and Power Department, China University of Petroleum (East China), Qingdao, 266580, Shandong, China

    Zhaoliang Wang, Xinrui Zhang, Jia Li, Guangfan Meng & Shuai Wang

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  1. Zhaoliang Wang
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  2. Xinrui Zhang
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  3. Jia Li
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Correspondence to Zhaoliang Wang.

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Wang, Z., Zhang, X., Li, J. et al. Subcooled boiling heat transfer characteristics of alcohol in micro-cylinder-groups. Heat Mass Transfer 55, 3603–3612 (2019). https://doi.org/10.1007/s00231-019-02681-3

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