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Research Papers: Evaporation, Boiling, and Condensation

Nucleate Pool Boiling Heat Transfer of R134a and R134a-PVE Lubricant Mixtures on Smooth and Five Enhanced Tubes

[+] Author and Article Information
Wen-Tao Ji, Nan Feng, Jian-Fei Guo

State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Ding-Cai Zhang

State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China; School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China

Mitsuharu Numata, Guannan Xi

Environmental Technology Laboratory, Daikin Industries, Ltd., Osaka 591-8511, Japan

Wen-Quan Tao1

State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Chinawqtao@mail.xjtu.edu.cn

1

Corresponding author.

J. Heat Transfer 132(11), 111502 (Aug 13, 2010) (8 pages) doi:10.1115/1.4001931 History: Received December 29, 2009; Revised May 14, 2010; Published August 13, 2010; Online August 13, 2010

Pool boiling heat transfer coefficients of R134a with different lubricant mass fractions for one smooth tube and five enhanced tubes were tested at a saturation temperature of 6°C. The lubricant used was polyvinyl ether. The lubrication mass fractions were 0.25%, 0.5%, 1.0%, 2.0%, 3.0%, 5.0%, 7.0%, and 10.0%, respectively. Within the tested heat flux range, from 9000W/m2 to 90,000W/m2, the lubricant generally has a different influence on pool boiling heat transfer of these six tubes.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic diagram of the experimental apparatus

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Figure 2

Sectional view of enhanced tubes

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Figure 3

Wilson plot for enhanced tube Nos.1 and 2

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Figure 4

Comparison of the experiment results with the Cooper and Gorenflo correlation

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Figure 5

Boiling heat transfer coefficients of pure R134a for six tubes

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Figure 6

Pool boiling heat transfer coefficients of R134a at a saturation temperature of 6°C with different lubrication concentrations

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Figure 7

Variation in the relative boiling heat transfer coefficient of lubricant-mixed refrigerant

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Figure 8

Variation in the relative boiling heat transfer coefficient of lubricant-mixed refrigerant reported in literatures

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