2026-04-14T08:31:07Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/4184502026-01-27T02:35:43Zcom_2072_1033col_2072_452950

Buoyant high-pressure transcritical fluid duct flows Bandarrinha Monteiro, Carlos Alexandre Jofre Cruanyes, Lluís Universitat Politècnica de Catalunya. Doctorat en Enginyeria Mecànica, Fluids i Aeronàutica Universitat Politècnica de Catalunya. Departament de Mecànica de Fluids Universitat Politècnica de Catalunya. GReCEF- Grup de Recerca en Ciència i Enginyeria de Fluids Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids Supercritical fluids Buoyancy effects Supercritical fluids Turbulent square duct Fluids supercrítics In this work, direct numerical simulations of a high-pressure transcritical square duct flow with distinct gravity directions in the cross-stream plane are performed. The buoyancy effects on the instantaneous and mean fields are analyzed. Significant differences are highlighted in the distributions of Prandtl’s second-kind motions due to a strong coupling effect between the high-pressure transcritical phenomena and the buoyancy effects. The observed phenomena indicate that prior characterizations of secondary flows and their contribution to heat and mass transfer (commonly considered as independent from the Reynolds number) do not apply in cases above the critical regime where strong variations in thermophysical properties are found. Furthermore, the number and dynamics of these secondary flows are significantly affected by the gravity direction. Peer Reviewed Postprint (published version) 2024 Conference report Bandarrinha, C.; Jofre, L. Buoyant high-pressure transcritical fluid duct flows. A: European Congress on Computational Methods in Applied Sciences and Engineering. "Proceedings of the 9th European Congress on Computational Methods in Applied Sciences and Engineering". Barcelona: International Centre for Numerical Methods in Engineering (CIMNE), 2024. ISBN 2696-6999. DOI 10.23967/eccomas.2024.054 . 2696-6999 https://hdl.handle.net/2117/418450 10.23967/eccomas.2024.054 eng https://www.scipedia.com/public/Monteiro_Jofre_2024a info:eu-repo/grantAgreement/EC/HE/101040379/EU/Turbulence-On-a-Chip: Supercritically Overcoming the Energy Frontier in Microfluidics/SCRAMBLE http://creativecommons.org/licenses/by-nc-sa/4.0/ Open Access Attribution-NonCommercial-ShareAlike 4.0 International 12 p. application/pdf International Centre for Numerical Methods in Engineering (CIMNE)