IIR document

Computational fluid dynamics simulations of two-phase R744 ejectors.


Carbon dioxide ejectors are efficient energy recovery devices in vapor-compression refrigeration units. This study aims to investigate the possibilities for modelling and analysis of two-phase flow in a specific ejector geometry using two different computational fluid dynamics (CFD) tools based on mixture models in STAR-CCM+ and ANSYS CFX. The ejector was operated according to six cases with subcritical and supercritical inlet conditions. Results were compared to the previous experimental data with respect to the mass flow rates, mass entrainment ratio, and ejector efficiency. Also, the pressure-related trends in the ejector geometry were investigated by using the pressure fields in the ejector geometry. The ANSYS CFX solver predicted the motive flow in the relative error range of 5.8 % to 13.7 %, while the relative errors were in the range of 4.8 % to 20.2 % in the STAR-CCM+ solver. Besides, the STAR-CCM+ solver achieved better prediction at the suction inlet.

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  • Original title: Computational fluid dynamics simulations of two-phase R744 ejectors.
  • Record ID : 30030989
  • Languages: English
  • Subject: Technology
  • Source: 10th IIR Conference on Ammonia and CO2 Refrigeration Technologies.
  • Publication date: 2023/04/27
  • DOI: http://dx.doi.org/10.18462/iir.nh3-co2.2023.0030


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