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Dynamique de goutte en microfluidique dans un système confiné

Abstract : The motion of a confined bubble/droplet is known to be influenced by the boundary conditions at the interface between the dispersed and continuous phases (Cantat, PoF 2013).Two classical experimental configurations (without any surfactants) have been reported:- a stress-free bubble pushed by an external phase, known as the Bretherton problem (Bretherton, JFM 1961);- a bubble pushed by Marangoni stress at the interface stemming from a constant temperature gradient, known as the Mazouchi problem (Mazouchi et al., PoF 2000).In order to study the influence of those boundary conditions, we have developped a microfluidic system allowing to monitor the bubble/droplet interfacial stress with a thermocapillary Marangoni stress.Our goal is to combine both of these configurations, by imposing an external pressure gradient and an external temperature gradient, with both theoretical and experimental approaches. We will present a new theoretical framework allowing to encompass both these contributions to the bubble/droplet motion, as well as corresponding experimental realisations.
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Alexandre Mansur. Dynamique de goutte en microfluidique dans un système confiné. Mécanique [physics]. PSL Research University, 2019. Français. ⟨NNT : 2019PSLET025⟩. ⟨tel-02460600v2⟩

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