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Émulsification en systèmes microstructurés

Abstract : This thesis, entitled Emulsification in micromixers was carried out within the framework of the Task Controlled Emulsification of the European IMPULSE project. Two micromixers in stainless steel, the V-type and the Caterpillar, were tested in an experimental setup. These microdevices working as black boxes, transparent micromixers were used after to gain insight into the fundamental mechanisms for emulsification. Firstly, the key parameters enabling the drop formation at macroscopic scale were identified. At microscopic scale, the droplet formation in the V-type micromixer results from the contact of aqueous and organic phases jets at the outlet of the microdevice and from elongational phenomena with interfacial instabilities. In the case of the Caterpillar, the droplets size depends on the internal geometry of the microdevice. The droplet formation can be mainly attributed to the shearing phenomena at the Y-junction. The decrease of the droplets size is then due to their passage through the mixing elements in series in the outlet channel. Moreover, the use of transparent micromixers allows to characterize these two micromixers by the micro-PIV and high speed camera. A straightforward relationship between the energy dissipation and the size of droplets was established for the Caterpillar, but not for the V-type. Moreover, the energy dissipation within these two micromixers is lower and the emulsions obtained having a more satisfactory quality than in the case of the classical emulsification processes
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Submitted on : Thursday, March 29, 2018 - 11:47:39 AM
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  • HAL Id : tel-01748738, version 1



Hélène Debas. Émulsification en systèmes microstructurés. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL075N⟩. ⟨tel-01748738⟩



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