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Home page > Seminars > Séminaires théorie > Theory Club mercredi 2 Octobre 2013 à 12:30 (salle 646A). Alexander Morozov: "Enhanced diffusion of tracers in a bath of self-propelled particles".

Theory Club mercredi 2 Octobre 2013 à 12:30 (salle 646A). Alexander Morozov: "Enhanced diffusion of tracers in a bath of self-propelled particles"

Unless otherwise stated, seminars and defences take place at 11:30 in room 454A of Condorcet building.

“Enhanced diffusion of tracers in a bath of self-propelled particles”

Alexander Morozov (Univ. of Edinburgh, Scotland)

Abstract:

Recent experiments have shown that micron-size tracer particles in dilute suspensions of either swimming bacteria or synthetic self-propelled particles perform diffusive motion with the diffusion coefficient significantly larger than its thermal value. Several theories have been proposed to explain the origin and magnitude of the enhanced tracer diffusivity. There is now a general agreement that it is proportional to the so-called "active flux" - the product of the swimmers number density and their velocity.

I will present a detailed theory and simulations of tracers diffusing in bacterial suspensions. Our work confirms the scaling with the active flux, but also unravels new important dependencies on the properties of the velocity field created by the swimmers and their kinematics. I will discuss how the long-range hydrodynamic interaction could have helped the present-day bacterial kinematics to evolve.

Mercredi 02/10/2013 - 12h30 Salle 646 A

Contact : Équipe séminaires / Seminar team - Published on / Publié le 27 September 2013

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