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Supercritical carbon dioxide heat transfer in horizontal tube based on the Froude number analysis

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  • Cheng, Liangyuan
  • Xu, Jinliang
  • Cao, Wenxuan
  • Zhou, Kaiping
  • Liu, Guanglin

Abstract

The heat transfer and pressure drop (ΔP) of supercritical fluid are crucial for the safety of advanced power cycles. Here, experiments were performed for sCO2 in a horizontal tube with inner diameter (din) of 10 mm, covering in the ranges of (G): 496.7–1346.2 kg/m2, heat flux (qw): 97.4～400.3 kW/m2 and pressure (P): 7.53–23.51 MPa. Inspired by the similarity of the outer wall temperature (Tow) distributions between the sCO2 flow and those of stratified-wavy-flow in subcritical pressures, the multiphase flow theory is introduced in subcritical pressures to deal with the sCO2 heat transfer. In the two-phase-like (TPL) regime, heat transfer coefficients (HTC) and friction factors (f) of sCO2 are found to significantly deviate from the correlations based on the single-phase flow theory. Further, the vapor-like Froude number FrVL is proposed to develop new correlations for both the heat transfer and the flow resistance covering the whole data range. The present paper establishes a connection between the flow resistance and heat transfer in supercritical pressures, which is important for the design and operation of sCO2 power cycles.

Suggested Citation

  • Cheng, Liangyuan & Xu, Jinliang & Cao, Wenxuan & Zhou, Kaiping & Liu, Guanglin, 2024. "Supercritical carbon dioxide heat transfer in horizontal tube based on the Froude number analysis," Energy, Elsevier, vol. 294(C).
    • Handle: RePEc:eee:energy:v:294:y:2024:i:c:s0360544224007527
    DOI: 10.1016/j.energy.2024.130980
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    References listed on IDEAS

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