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Numerical simulation of a two-phase transcritical carbon dioxide Ranque-Hilsch vortex tube.

Number: 0301

Author(s) : OBERTI R., METSUE A., FANG Y., LAGRANDEUR J., PONCET S., MONNEY D.

Summary

The Ranque-Hilsch vortex tube has the potential to act as a robust expansion device and a useful energy supply while reducing throttling losses between the gas cooler and the evaporator in the transcritical CO2 heat pump cycle. In the present work, a three-dimensional numerical simulation is carried out to study the vortex tube two-phase compressible flow at supercritical inlet operating conditions. A density-based solver along with the homogeneous equilibrium model, a low-Reynolds turbulence closure and the real-gas
Span-Wagner equation of state are selected. First, a supercritical CO2 expansion inside a de Laval nozzle is performed for a validation purpose using pressure measurements available in the literature. Then, the Ranque-Hilsch vortex tube results revealed that the two-phase transcritical CO2 temperature separation happens below the inlet temperature and is reduced between both ends suggesting that the vortex tube outlet functions could be reversed. The two-phase mixture was formed in the main tube periphery with
decreasing vapor quality towards the hot exit. Experiments are required to validate this model and contribute to a better predictability of transcritical CO2-operated vortex tubes for heat pump applications.

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Pages: 301

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Details

  • Original title: Numerical simulation of a two-phase transcritical carbon dioxide Ranque-Hilsch vortex tube.
  • Record ID : 30031391
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0301

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