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Experimental Study on Condensation Heat Transfer Characteristics inside an Inclined Wave-Finned Flat Tube of Direct Air-Cooling System

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Abstract

In this paper, the condensation heat transfer characteristics of parallel flow and counter flow inside an inclined wave-finned flat tube is investigated experimentally. The condensation heat transfer coefficients are analyzed based on the experimental results. Results of experiments show that condensation heat transfer coefficient decreases as the temperature difference Δt=ts—tw increases and mass flow rate decreases. The parallel flow has a similar development with the counter flow, and the condensation heat transfer coefficient of counter flow is less than that of parallel flow under the same air cooling conditions. In addition, condensation heat transfer coefficient correlations are also obtained under experimental ranges. The calculations agree well with the measured data and the agreement is seen to be within ±4% for the parallel flow and ±5% for the counter flow.

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Abbreviations

A c :

section area/m2

d :

pipe diameter/m

d e :

equivalent diameter/m

G :

mass flow rate/kg·m−2·s−1

g :

acceleration of gravity/m·s−2

h :

condensation heat transfer coefficient/W·m−2·K−1

k :

correction factor

l :

length of the vertical wall/m

Nu :

Nusselt number

P :

pressure/Pa

Q :

heat release of vapor condensation/W

Re :

Reynolds number

r :

latent heat of vaporization/J·kg−1

t :

temperature/K

u :

velocity/m·s−1

ρ :

density/kg·m−3

μ :

dynamic viscosity/Pa·s

δ :

thickness/m

Δ:

difference

λ :

thermal conductivity/W·m−1·K−1

cal:

calculation

exp:

experimentally determined

g:

gas, gravity

H:

horizontal

l:

liquid

m:

average value

s:

steam

V:

vertical

w:

wall

x :

X coordinate

y :

Y coordinate

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 11675128).

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Authors and Affiliations

  1. State Key Laboratory for Manufacturing Systems Engineering, **’an Jiaotong University, **’an, 710049, China

    Haitao Wang, Tao Tao & Xuesong Mei

  2. Shaanxi Key Laboratory of Intelligent Robots, School of Mechanical Engineering, **’an Jiaotong University, **’an, 710049, China

    Haitao Wang, Tao Tao & Xuesong Mei

  3. State Key Laboratory of Multiphase Flow in Power Engineering, **’an Jiaotong University, **’an, 710049, China

    Haijun Wang & Hongfang Gu

Authors
  1. Haitao Wang
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  2. Tao Tao
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  3. Xuesong Mei
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  4. Haijun Wang
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  5. Hongfang Gu
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Corresponding authors

Correspondence to Haitao Wang or Tao Tao.

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Wang, H., Tao, T., Mei, X. et al. Experimental Study on Condensation Heat Transfer Characteristics inside an Inclined Wave-Finned Flat Tube of Direct Air-Cooling System. J. Therm. Sci. 30, 432–440 (2021). https://doi.org/10.1007/s11630-020-1353-8

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  • DOI: https://doi.org/10.1007/s11630-020-1353-8

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