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Numerical Study on R32 Flow Condensation in Horizontally Oriented Tubes with U-Bends

Author

Listed:
  • Zehan Cao

    (Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Hao Zhang

    (Department of Refrigeration & Cryogenic Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
    Guangdong Midea Refrigeration Equipment Co., Ltd., Foshan 528311, China)

  • Haohan Mei

    (Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Gang Yan

    (Department of Refrigeration & Cryogenic Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Wenxiao Chu

    (Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Qiuwang Wang

    (Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract

In this paper, the flow condensation heat transfer characteristics of R32 in a horizontally oriented tube with a horizontal U-bend (HUB tube) and a horizontally oriented tube with a vertical U-bend (VUB tube) were numerically investigated. The volume of fluid (VOF) multiphase model with the mass transfer assumption by Lee is adopted to simulate the flow condensation behavior of R32, which are validated by well-known empirical correlations. The influence of structural parameters, mass flux and vapor quality on the heat transfer coefficient (HTC) and liquid film distribution is investigated. Meanwhile, the local liquid film thickness (LLFT) and local heat transfer coefficient (LHTC) are also depicted. The phase transition at the U-bend section is captured. Results show that the U-bend has remarkable disturbance on the flow pattern and LHTC due to the effect of centrifugal force where the LLFT is changed, inducing strong secondary flow. The LHTC is increased by a maximum of 8.47% and 11.86% in VUB tube and HUB tube, respectively, when compared to the case in a horizontally straight oriented tube at the same operating conditions.

Suggested Citation

  • Zehan Cao & Hao Zhang & Haohan Mei & Gang Yan & Wenxiao Chu & Qiuwang Wang, 2022. "Numerical Study on R32 Flow Condensation in Horizontally Oriented Tubes with U-Bends," Energies, MDPI, vol. 15(13), pages 1-21, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:13:p:4799-:d:852591
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    References listed on IDEAS

    as
    1. Lee, Yee-Ting & Hong, Sihui & Chien, Liang-Han & Lin, Chih-Jer & Yang, An-Shik, 2020. "Heat transfer and pressure drop of film condensation in a horizontal minitube for HFO1234yf refrigerant," Applied Energy, Elsevier, vol. 274(C).
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    More about this item

    Keywords

    R32 flow condensation; VOF model; heat transfer coefficient; film thickness;
    All these keywords.

    JEL classification:

    • R32 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - Real Estate Markets, Spatial Production Analysis, and Firm Location - - - Other Spatial Production and Pricing Analysis

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