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Coupling Effect of Heat Transfer and Flow Resistance in the Rifled Tube Water Wall of a Ultra-Supercritical CFB Boiler

  • Yaode Li
  • Dong YangEmail author
  • Shijie Ouyang
  • Dan Liu
  • Wenyu Wang
Article
  • 4 Downloads

Abstract

The coupling factor is used in this study to characterise the combined effect of the heat transfer and resistance characteristics of a rifled tube. Boundary layer theory is utilised to investigate the relationship between the comprehensive coefficient and Reynolds number in two regions, namely, higher and lower than pseudo-critical enthalpy. Results indicate that mass flux exerts a decisive negative influence on the coupling effect, and the impacts of pressure and heat flux are weak. The overall effect decreases rapidly as the mass flux increases, but it increases in the area behind the quasi-critical enthalpy. The coupling effect is also affected by specific heat ratio, thermal acceleration and buoyancy. The correlations of heat transfer and friction resistance are deduced with high precision according to experimental data.

Keywords

supercritical pressure heat transfer frictional resistance coupling effect 

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Notes

Acknowledgements

This work is financially supported by the National Key Research & Development Program of China (No. 2016YFB0600201).

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Copyright information

© Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yaode Li
    • 1
    • 2
  • Dong Yang
    • 1
    Email author
  • Shijie Ouyang
    • 1
  • Dan Liu
    • 1
  • Wenyu Wang
    • 1
  1. 1.State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’anChina
  2. 2.North China Electric Power Test and Research Institute Co., LtdTianjingChina

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