Author, as appears in the article.: Šeta B; Gavalda J; Bou-Ali MM; Ruiz X
Department: Química Física i Inorgànica
URV's Author/s: Gavaldà Martínez, Josefa / Ruiz Martí, José Javier / SETA, BERIN
Abstract: © 2020 Elsevier Masson SAS In the present work, an interferometric unsteady analysis of the thermogravitational technique was for the first time attempted in a paralelepipedic microcolumn using binary mixtures with negative Soret coefficients. In particular, water/ethanol and toluene/methanol were considered, as they have significantly different thermophysical properties and relaxation times. Experiments were run with different temperature gradients in order to understand their impact on the stability of separation. Experimental results were compared with theoretical ones, predicted by Fury-Jones-Onsager theory, and by OpenFOAM 3D numerical simulations. Correlations between the separation and the flow in the third dimension perpendicular to the thermal gradient of the thermogravitational microcolumn were analysed. Numerical simulations were also conducted in traditional cylindrical columns in order to compare the results with those previously reported. In these cases, the impact on separation stability was correlated with the azimuthal component of velocity. Thus, in both configurations, the disturbing convective current, always generated in the direction perpendicular to the thermal gradient applied, was shown to be vital for flow stability analysis.
Thematic Areas: Thermodynamics Matemática / probabilidade e estatística Interdisciplinar General engineering Engineering, mechanical Engineering (miscellaneous) Engineering (all) Engenharias iii Engenharias ii Engenharias i Condensed matter physics Ciências ambientais Astronomia / física Arquitetura e urbanismo
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: josepxavier.ruiz@urv.cat fina.gavalda@urv.cat
Author identifier: 0000-0003-4020-4457 0000-0001-7881-4192
Record's date: 2023-02-26
Papper version: info:eu-repo/semantics/acceptedVersion
Link to the original source: https://www.sciencedirect.com/science/article/abs/pii/S1290072919320496
Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: International Journal Of Thermal Sciences. 156 106464-
APA: Šeta B; Gavalda J; Bou-Ali MM; Ruiz X (2020). Stability analysis under thermogravitational effect. International Journal Of Thermal Sciences, 156(), 106464-. DOI: 10.1016/j.ijthermalsci.2020.106464
Article's DOI: 10.1016/j.ijthermalsci.2020.106464
Entity: Universitat Rovira i Virgili
Journal publication year: 2020
Publication Type: Journal Publications
Repositori URV