Auto-organisation, écho et trafic microfluidique

Abstract : This research deals with collective dynamics of particles advected by low Reynolds flows in confined geometries. The particles interact via long-range hydrodynamic couplings which originate from the geometry or the topology of the systems. The long-range nature of the interactions leads to highly non trivial dynamics, that are addressed via two main studies. Both are related through the well-know property of hydrodynamic reversibility. This PhD-thesis combines tools from three main domains of physics : hydrodynamic, dynamical systems and soft-matter. The first system is a 2D monodisperse emulsion confined in a Hele-Shaw cell and submitted to a periodic drive in order to probe the reversible nature of the dynamics. This echo-experiment characterized by reversible dynamics at the microscopic level exhibits a very clear first order transition between a macroscopic reversible state at low rive and a macroscopic irreversible state at large drive. Furthermore, it is shown that this transition is not merely dynamical but also structural. The second study is about the traffic dynamics of three droplets travelling in large microfluidic-loop networks. Combining numerical, analytical and experimental tools, it is shown that the asymptotic dynamics is Hamiltonian and reversible.
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Contributor : Raphael Jeanneret <>
Submitted on : Friday, January 24, 2014 - 11:26:52 AM
Last modification on : Thursday, July 4, 2019 - 11:00:04 AM
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  • HAL Id : pastel-00935876, version 1

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Raphael Jeanneret. Auto-organisation, écho et trafic microfluidique. Dynamique des Fluides [physics.flu-dyn]. Université Paris-Diderot - Paris VII, 2014. Français. ⟨pastel-00935876⟩

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