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Journal Articles European Physical Journal E: Soft matter and biological physics Year : 2022

Stabilized convection in a ternary mixture with two Soret coefficients of opposite sign

Abstract

Abstract We performed ground-based experiments on the sample polystyrene–toluene–cyclohexane in order to complement the experimental activities in microgravity conditions related to the ESA projects DCMIX4 and Giant Fluctuations. After applying a stabilizing thermal gradient by heating from above a layer of the fluid mixture, we studied over many hours the density variations in the bidimensional horizontal field by means of a Shadowgraph optical setup. The resulting images evidence the appearance of convective instability after a diffusive time associated with the binary molecular solvent consisting of toluene and cyclohexane, confirming the negative sign of the Soret coefficient of this mixture. After a larger diffusive time related to mass diffusion of the polystyrene in the binary solvent, convection was suppressed by the increasing stabilizing density gradient originated by the Soret-induced concentration gradient of the polymer. This is compatible with a positive sign of the Soret coefficient of the polymer in the binary solvent. Graphic Abstract
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Dates and versions

hal-03974082 , version 1 (17-02-2023)

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Cite

Loreto García-Fernández, Henri Bataller, Paul Fruton, Cédric Giraudet, Alberto Vailati, et al.. Stabilized convection in a ternary mixture with two Soret coefficients of opposite sign. European Physical Journal E: Soft matter and biological physics, 2022, 45 (6), pp.52. ⟨10.1140/epje/s10189-022-00202-5⟩. ⟨hal-03974082⟩
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