Antoine Metsue
PhD student
Ir. at UCLouvain in 2020

Main project: CFD modeling of a transcritical CO2 ejector integrated in a heat pump
Funding: FRIA/Usherbrooke
Supervisor(s): Yann Bartosiewicz

Carbon dioxide (CO2) is an appropriate replacement for conventional refrigerants due to its limited impacts on climate change. However, the transcritical CO2 compression cycle has a low thermodynamic performance due to large expansion losses. An ejector is a favorable device which enables the use of CO2 and other environmentally friendly refrigerants. It helps to reduce losses by recovering part of the expansion work in a throttling process and improve the efficiency of the system.

The main objective of the proposed research is to develop numerical tools that will enable to (i) have an efficient/rapid methodology to design and to achieve a parametric study of a CO2 ejector to be incorporated in a refrigeration/heat pump cycle, (ii) deeply analyze the transport phenomena occurring in two-phase ejectors to improve our knowledge of the flow physics and its role in their performance.

In order to fulfill these objectives, the numerical approach will rely on a multiscale approach, i.e. 1D or thermodynamic models, Reynolds-Averaged Navier-Stokes (RANS) models, and high fidelity simulations such as Large Eddy Simulations (LES). Indeed the first approach (1D) is necessary to have a first rough idea of the design for a specific application, while the second (RANS) approach allows to get a good average, yet local, description of the internal flow field and to perform parametric analysis; this approach also gives the opportunity to develop the diagnosis tools to investigate transport phenomena. The last approach (LES) gives a total description of the flow, including turbulent fluctuations and a complete resolution of the large scale structures responsible of the mixing.

Finally the overall methodology should be tested on a real case; in this regards, it is foreseen to use the developed tools to design and test a CO2 ejector to be integrated within a large scale industrial experiment.

IMMC main research direction(s):
Fluid mechanics

fluid structure interaction

Research group(s): TFL
Collaborations: Joint Ph.D with the University of Sherbrooke. The co-supervisor (outside IMMC) is Pr. Sébastien Poncet.

Recent publications

See complete list of publications

Journal Articles

1. Metsue, Antoine; Debroeyer, Romain; Poncet, Sébastien; Bartosiewicz, Yann. An improved thermodynamic model for supersonic real-gas ejectors using the compound-choking theory. In: Energy, Vol. 382, no. 111362 (2021). doi:10.1016/

2. Croquer, Sergio; Yang, Yu-Fang; Metsue, Antoine; Bartosiewicz, Yann; Poncet, Sébastien. Compound-Choking Theory for Supersonic Ejectors Working with Real Gas. In: Energy, Vol. 227, no. 120396 (2021). (Accepté/Sous presse).

3. Croquer, Sergio; Fang, Yu; Metsue, Antoine; Bartosiewicz, Yann; Poncet, Sébastien. Compound-choking theory for supersonic ejectors working with real gas. In: Energy, Vol. 227 (2021). doi:10.1016/

Conference Papers

1. Metsue, Antoine; Debroeyer, Romain; Poncet, Sébastien; Bartosiewicz, Yann. An improved thermodynamic model for supersonic ejectors. 2021 xxx.

2. Metsue, Antoine; Bartosiewicz, Yann; Poncet, Sébastien. Investigation on Ejector Design for CO2 Heat Pump Applications Using Dymola. 2021 xxx.