Título
Stability analysis under thermogravitational effectAutor-a
Otras instituciones
Universitat Rovira i VirgiliVersión
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© 2020 Elsevier Masson SASAcceso
Acceso embargadoVersión del editor
https://doi.org/10.1016/j.ijthermalsci.2020.106464Publicado en
International Journal of Thermal Sciences Vol. 156. N. artículo 106464, 2020Editor
Elsevier Masson SASResumen
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 So ... [+]
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. [-]
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