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Theses

Inertial migration of particles in microchannel flows

Abstract : This thesis aims to better understand the physical mechanism controlling the trajectories of particles in confined flows in order to improve predictive models. In the first step we have developed experimental tools based on microscopy and image analysis in order to identify the particles positions in confined flows in square section microchannels. These tools have then permitted to obtain original results on the lateral migration of spherical particles in flows at low inertia. In particular we have shown that neutrally buoyant particles in square channels are focused at channel center at low Reynolds number and at four channel faces at high Reynolds, and that there is a co-existence of the two regimes for intermediate Reynolds. In addition to their lateral migration, under certain conditions, particles can also align in the flow direction to form trains of evenly spaced particles. This work has thus been devoted to the statistical study on the quantification and localization of the train formation and configuration. It has been shown that the formation of trains is controlled by the flow configuration in the wake of the particles, and that the train characteristics, i.e., the fraction of particles in trains and the interparticle distance, are functions of the particle Reynolds number. Finally, preliminary results on flows of bidisperse suspensions have been obtained. To conclude, the perspectives and future developments of this work are presented.
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Submitted on : Wednesday, November 8, 2017 - 3:17:08 PM
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  • HAL Id : tel-01630993, version 1

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Yanfeng Gao. Inertial migration of particles in microchannel flows. Mechanics of the fluids [physics.class-ph]. INSA de Toulouse, 2017. English. ⟨NNT : 2017ISAT0010⟩. ⟨tel-01630993⟩

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