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Instabilités de Rayleigh-Bénard-Marangoni, induites par évaporation, en régime transitoire. Applicatons aux solutions polymères

Abstract : This work aims to study numerically how instabilities are activated in the drying of solvent/polymer solution. Solvent evaporation induces both a cooling and a decrease in solvent concentration at the free surface. Consequently, density variations (buoyancy) and/or super ficial tension variations (Marangoni eff ect) can gene- rate convection into the bulk. Besides, since the temperature and concentration gradients but also the thickness of the solution evolve during the drying, we are dealing here with a full transient problem. For this purpose, two simpli ed models are established for thermal and solutal regimes respectively. This study mainly focuses on : the transient character of the problem, the role of each phenomenon (thermal/solutal), on one hand, and the impact of the evolution of the solvent mass fraction and by the way of the viscosity of the solution, on the other hand, on the instability thresholds and the flow structure.
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Submitted on : Tuesday, June 7, 2011 - 5:06:30 PM
Last modification on : Monday, December 14, 2020 - 9:51:30 AM
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  • HAL Id : tel-00598835, version 1

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Benoît Trouette. Instabilités de Rayleigh-Bénard-Marangoni, induites par évaporation, en régime transitoire. Applicatons aux solutions polymères. Mécanique [physics.med-ph]. Université Paris Sud - Paris XI, 2010. Français. ⟨tel-00598835⟩

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