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Experimental and Computational Multiphase Flow

, Volume 1, Issue 3, pp 219–229 | Cite as

Role of gravity in condensation flow of R1234ze(E) inside horizontal mini/macro-channels

  • Xin Gu
  • Jian Wen
  • Jin Tian
  • Chaolong Li
  • Huaqing Liu
  • Simin WangEmail author
Research Article
  • 25 Downloads

Abstract

The condensation patterns of R1234ze(E) inside horizontal mini/macro-channels were numerically investigated under normal-gravity and zero-gravity conditions. The gravity effects on condensation heat transfer coefficients, liquid film thickness, film distribution, cross-sectional stream-traces, and liquid-phase velocity were analyzed detailedly. The influence of surface tension on condensation flow was also discussed. The gravity effect on condensation heat transfer coefficients was negligible in mini-channels with D = 1 mm, while was important for D = 2 mm and D = 4.57 mm. The gravity effect can either enhance or weaken the condensation heat transfer coefficient, which was dependent on the tube diameter and vapor quality. The enhancement on heat transfer caused by the gravity was more pronounced at lower vapor quality and mass fluxes with a larger diameter tube. The gravity affected the condensation heat performance through changing the vapor-liquid distribution, rather than the film thickness. The gravity has a great influence on the condensation flow field in both circumferential and axial direction. The surface tension played an important role in heat transfer under zero-gravity condition.

Keywords

condensation mini/macro-channels heat transfer gravity surface tension 

Notes

Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 51676146), for which the authors are thankful.

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Copyright information

© Tsinghua University Press 2019

Authors and Affiliations

  • Xin Gu
    • 1
  • Jian Wen
    • 1
  • Jin Tian
    • 1
  • Chaolong Li
    • 1
  • Huaqing Liu
    • 1
  • Simin Wang
    • 2
    Email author
  1. 1.Department of Refrigertation and Cryogenics Engineering, School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’anChina
  2. 2.Department of Process Equipment and Control Engineering, School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’anChina

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