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Effect of grooves on nucleate boiling heat transfer from downward facing hemispherical surface

  • Dawen Zhong
  • Jun Sun
  • Ji’an MengEmail author
  • Zhixin Li
  • Xiang Zhang
  • Chen Lin
Research Article
  • 151 Downloads

Abstract

The external reactor vessel cooling (ERVC) is the key method to ensuring the success of in-vessel retention (IVR), which is one strategy of the Generation III+ advanced light water nuclear reactor to address severe accidents. The heat removal ability of ERVC is limited by the critical heat flux (CHF) on the outer surface of the lower head. In this paper, a heating system with the liquid metal as the intermediate heat medium in the scaled vessel was used to investigate the boiling heat transfer. A three-dimensional (3D) hemispherical grooved surface on scaled vessel was proposed and its steady boiling performance was investigated in saturated water. Consequently, the liquid metal temperature exceeded 430 °C when the heating power was 185 kW and the boiling crisis occurred, and the CHF increased from 967.4 to 2030.2 kW/m2 when the orientation increased from 5° to 85°. Compared with the 3D plain surface, the CHF enhancement was higher than 102%. The CHF enhancement could attribute to the increase of heat transfer area and the improvement of the wettability. If the grooves on the reactor vessel could be manufactured by 3D printing in the future, the grooved surface will be a promising structure for ERVC.

Keywords

downward facing boiling critical heat flux (CHF) liquid metal grooved surface 

Notes

Acknowledgements

The financial support extended by the National Natural Science Foundation of China (No. 51706068), Beijing Natural Science Foundation (No. 3192035), Beijing Key Research and Development Program (No. Z181100005118013), the China Advanced Light Water Reactors Major Projects (No. 2011ZX06004-008), and the Fundamental Research Funds for the Central Universities (No. 2017MS039) is gratefully acknowledgement.

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Copyright information

© Tsinghua University Press 2019

Authors and Affiliations

  • Dawen Zhong
    • 1
  • Jun Sun
    • 2
  • Ji’an Meng
    • 3
    Email author
  • Zhixin Li
    • 3
  • Xiang Zhang
    • 4
  • Chen Lin
    • 5
  1. 1.Beijing Key Laboratory of Passive Nuclear Safety TechnologyNorth China Electric Power UniversityBeijingChina
  2. 2.Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of EducationTsinghua UniversityBeijingChina
  3. 3.Key Laboratory of Thermal Science and Power Engineering, Ministry of EducationTsinghua UniversityBeijingChina
  4. 4.State Nuclear Power Technology Research & Development CenterBeijingChina
  5. 5.School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijingChina

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