14 November 2024

Webinar Elizabeth GUAZELLI

Elisabeth Guazzelli's research interests are in the field of particulate multiphase flows, such as fluidized beds, suspensions, sedimentation and sediment transport. She has spent her entire career as a CNRS researcher, leading an active and diversified research group at the IUSTI laboratory of the University of Aix-Marseille, and has now moved to the MSC (Matière et Systèmes Complexes) laboratory of the University Paris Cité. She is Rector of the International Center for Mechanical Sciences in Udine (Italy). She has been Associate Editor of the Journal of Fluid Mechanics since 2005 and is currently JFM Rapids Editor. Fellow of the American Physical Society and of the European Mechanics Society (EUROMECH), she is the recipient of the EUROMECH Fluid Mechanics Prize in 2016 and the APS Fluid Dynamics Prize in 2023. She was elected an international member of the Istituto Veneto di Scienze, Lettere ed Arti in 2020 and of the US National Academy of Engineering in 2021.
Bodies of revolution in shear flows at low inertia

Suspensions of axisymmetric (or quasi-axisymmetric) particles are ubiquitous in natural and industrial applications, including the formation of snow crystals in clouds, the dynamics of plankton in the ocean, the contamination of marine environments by microplastics, the dynamics of red blood cells, the production of paper, and the reinforcement of composites with particles. We experimentally investigate the rotational dynamics of neutrally buoyant bodies of revolution (spheroids, fibers, disks, rings with different cross-sectional shapes) in shear flows. In Stokes flows, the axis of revolution of these rigid particles moves in one of a family of closed periodic Jeffery orbits. Inertia is able to lift this degeneracy and induces drift among several rotations toward limiting stable orbits. Permanent alignment can also be achieved for disks and rings of triangular cross-sectional shape at large enough inertia. The bifurcations between the different dynamics are examined and compared to those predicted by small-inertia asymptotic theories and numerical simulations.

This work has been undertaken with Laurence Bergougnoux, Davide Di Giusto, and Cristian Marchiol

14 November 2024, 16h3018h00
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