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Numerical simulation on buoyancy-induced deterioration of supercritical heat transfer.

Number: pap. n. 1323

Author(s) : HE J., DANG C., HIHARA E.

Summary

The unique characteristics of thermo-physical properties of a fluid under supercritical pressures have profound effect on the heat transfer. The buoyancy effect that is induced by the severe variation of density in radial direction would cause the heat transfer deterioration. In this study, numerical simulation is conducted with R245fa at 4MPa to investigate the mechanism on the heat transfer deterioration phenomena. Low-Re turbulence model is adopted for the simulation. Results show that the flow field is significantly distorted due to the effect of buoyancy, leading to suppression of the turbulence production. Agreement is achieved between the previous theoretical study and present simulation investigation in terms of the location of salient points of velocity profiles. Simulation with the density-modified R245fa is conducted as well. Results show that the heat transfer deterioration is improved with a smaller density difference between liquid-like and gas-like region, suggesting the density difference has profound effect on heat transfer under supercritical pressures.

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Pages: 7

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Details

  • Original title: Numerical simulation on buoyancy-induced deterioration of supercritical heat transfer.
  • Record ID : 30026100
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1323

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