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A density-based solver using real gas properties for R744 supersonic flashing simulations.

Number: pap. n. 263

Author(s) : FANG Y., PONCET S., BARTOSIEWICZ Y., et al.

Summary

A density-based solver based on the OpenFoam library is coupled with a tabulated equation of state which allows to accurately compute the properties of CO2 at a reduced computational cost. The homogeneous equilibrium model (HEM) is considered to predict the phase-change phenomenon. The Navier-Stokes characteristic boundary condition is used as the outlet boundary condition to guarantee the accuracy and stability of the simulation. As a result, this solver is suitable to simulate supersonic flashing CO2 flows in converging-diverging nozzles and supersonic ejectors. Firstly, the flows in the converging-diverging nozzle are simulated under supercritical condition. A good agreement in terms of pressure distribution is obtained. Then, a two-phase CO2 ejector is investigated numerically. Once again, a good agreement is obtained against experimental wall pressure measurements.

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Details

  • Original title: A density-based solver using real gas properties for R744 supersonic flashing simulations.
  • Record ID : 30025975
  • 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.2019.0263

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