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Experimental investigation of Marangoni condensation of ethanol–water mixture vapors on vertical tube

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Abstract

The heat transfer characteristics of the condensation of ethanol–water binary vapor on vertical tubes with the pipe diameter of 10 mm were investigated experimentally. The results showed that, with the change of the vapor-to-surface temperature difference, the condensation heat transfer coefficients revealed nonlinear characteristics with peak values under a wide variety of operating conditions. With the increasing pressure or velocity of the vapor, the heat transfer coefficients increased subsequently. The effect of vapor pressure or velocity on heat transfer coefficients reduced with the increasing ethanol mass fraction. It was noteworthy that, under low ethanol mass fractions (0.5–2%), the heat transfer coefficients augmented significantly, were about 5–8 times greater than that of pure steam. The comparison for different test blocks indicated that the condensation heat transfer coefficients for different pipe diameters were about the same value under the same operating condition. Significant heat transfer enhancement by Marangoni condensation could be achieved for full range of pipe diameter used in industrial condensers.

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Abbreviations

W e∞ :

Ethanol vapor concentration (%)

H :

Heat transfer coefficients (kW/m2K)

h 0 :

Heat transfer coefficients for pure steam (kW/m2K)

p :

Vapor pressure (kPa)

q :

Heat flux (kW/m2)

T :

Temperature (K)

ΔT :

The vapor to surface temperature difference (K)

r w :

The external radius of the tube (m)

U :

Vapor velocity (m/s)

λ:

Thermal conductivity (W/K)

v :

Vapor mixtures

w :

Tube wall

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Acknowledgments

The authors greatly appreciate Prof. Y. Utaka at Yokohama National University, for his experimental assistance and academic discussion. This project has been supported by National Natural Science Foundation of China (No. 50476048 and 50521604).

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Authors and Affiliations

  1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, People’s Republic of China

    Jinshi Wang, Junjie Yan, Yang Li & Shenhua Hu

  2. School of Energy and Power Engineering, Xi’an Jiaotong University, 710049, Xi’an, People’s Republic of China

    Junjie Yan

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  1. Jinshi Wang
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  2. Junjie Yan
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  3. Yang Li
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  4. Shenhua Hu
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Correspondence to Junjie Yan.

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Wang, J., Yan, J., Li, Y. et al. Experimental investigation of Marangoni condensation of ethanol–water mixture vapors on vertical tube. Heat Mass Transfer 45, 1533–1541 (2009). https://doi.org/10.1007/s00231-009-0528-3

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  • DOI: https://doi.org/10.1007/s00231-009-0528-3

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