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Correlation evaluation on circumferentially average heat transfer for supercritical carbon dioxide in non-uniform heating vertical tubes

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  • Fan, Y.H.
  • Tang, G.H.
  • Li, X.L.
  • Yang, D.L.
  • Wang, S.Q.

Abstract

Supercritical heat transfer mechanisms and heat transfer correlations are firstly reviewed in present paper. The heat transfer characteristics of S-CO2 in circumferentially non-uniform heated vertical upward flow are then numerically studied and the fundamental mechanisms are discussed. The abnormal heat transfer for S-CO2 is believed to be caused by the comprehensive effect of thermophysical property variations. For S-CO2 with non-uniform heating and large mass flow rate, the enhanced heat transfer is mainly related to the large specific heat in the near wall region while the deteriorated heat transfer is dominated by the thickening viscous sublayer induced by the viscosity increase. Besides, the buoyancy effect induced by the density variation is still prominent to axial velocity distribution even in the forced convection. Finally a new correlation with higher accuracy is developed for S-CO2 circumferentially average heat transfer by introducing the correction parameters of viscosity, specific heat, axial flow-acceleration and non-uniform heat flux.

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  • Fan, Y.H. & Tang, G.H. & Li, X.L. & Yang, D.L. & Wang, S.Q., 2019. "Correlation evaluation on circumferentially average heat transfer for supercritical carbon dioxide in non-uniform heating vertical tubes," Energy, Elsevier, vol. 170(C), pages 480-496.
    • Handle: RePEc:eee:energy:v:170:y:2019:i:c:p:480-496
    DOI: 10.1016/j.energy.2018.12.151
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    References listed on IDEAS

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    Cited by:

    1. Liu, Xiaokai & Guo, Jiangfeng & Han, Zengxiao & Cheng, Keyong & Huai, Xiulan, 2022. "Studies on thermal-hydraulic characteristics of supercritical CO2 flows with non-uniform heat flux in a tubular solar receiver," Renewable Energy, Elsevier, vol. 201(P1), pages 291-304.
    2. Fan, Y.H. & Tang, G.H. & Sheng, Q. & Li, X.L. & Yang, D.L., 2023. "S–CO2 cooling heat transfer mechanism based on pseudo-condensation and turbulent field analysis," Energy, Elsevier, vol. 262(PA).
    3. Fan, Y.H. & Yang, D.L. & Tang, G.H. & Sheng, Q. & Li, X.L., 2022. "Design of S–CO2 coal-fired power system based on the multiscale analysis platform," Energy, Elsevier, vol. 240(C).
    4. Li, X.L. & Li, G.X. & Tang, G.H. & Fan, Y.H. & Yang, D.L., 2023. "A generalized thermal deviation factor to evaluate the comprehensive stress of tubes under non-uniform heating," Energy, Elsevier, vol. 263(PA).
    5. Zhang, Shijie & Xu, Xiaoxiao & Liu, Chao & Dang, Chaobin, 2020. "A review on application and heat transfer enhancement of supercritical CO2 in low-grade heat conversion," Applied Energy, Elsevier, vol. 269(C).
    6. Zhou, Jing & Zhu, Meng & Xu, Kai & Su, Sheng & Tang, Yifang & Hu, Song & Wang, Yi & Xu, Jun & He, Limo & Xiang, Jun, 2020. "Key issues and innovative double-tangential circular boiler configurations for the 1000 MW coal-fired supercritical carbon dioxide power plant," Energy, Elsevier, vol. 199(C).

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