 Numerical benchmark of a Ranque–Hilsch vortex tube working with subcritical carbon dioxideRaphaël Oberti, Junior Lagrandeur and Sébastien Poncet Energy, 2023, vol. 263, issue PC Abstract: A numerical benchmark of a Ranque–Hilsch vortex tube using subcritical carbon dioxide as the working fluid is performed. Predictions using different thermodynamic and two-equation turbulence models in high or low-Reynolds number formulations are compared to experimental data available in the literature. The results show that the k−ω SST model outperforms both the Standard k−ϵ model and the SAS-SST model in terms of cold and hot outlet total temperature predictions. Considering real-gas equations of state improves the accuracy even at subcritical conditions. In this regard, the multi-parameter Span–Wagner equation of state yields the best hot outlet total temperature prediction, especially at high operating pressure. Hence, the k−ω SST model in conjunction with the Span–Wagner equation of state are selected to examine internal flow features and discuss the validity of most common assumptions made by one-dimensional thermodynamic models. Finally, the exergy efficiency of the present vortex tube at various cold mass fractions is quantified. Keywords: Vortex tube; Subcritical regime; Carbon dioxide; Turbulence modeling; Equation of state; Exergy (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:263:y:2023:i:pc:s0360544222026792 DOI: 10.1016/j.energy.2022.125793 Access Statistics for this article Energy is currently edited by Henrik Lund and Mark J. Kaiser More articles in Energy from Elsevier |
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