About Slip Particles : Case of the Anisotropic Inhomogeneous Navier Condition
Lundi 27 janvier 2020 14:00
- Duree : 1 heure
Lieu : Conference room - LIPhy - Bât E - 140 Avenue de la Physique - St Martin d’Hères. Accès par interphone, appeler le secrétariat
Orateur : Antoine SELLIER (Ladhyx, Ecole Polytechnique, Paris)
At small scale it is often necessary to give up the usual no-slip requirement at the surface of a solid particle and to replace it with a suitable slip condition. One widely-employed slip condition is the Navier condition proposed in 1823 by Navier for a plane slip impermeable surface and later both extended to curved surfaces and experimentally confirmed. Such a condition assumes a homogeneous isotropic slip on the particle surface. Here, we consider a more general anisotropic inhomogeneous extended Navier condition which has been proposed in the last decade. This condition characterizes the slip at each point on the particle surface by two local orthogonal directions of slip tangent to the surface and two associated local slip lengths. Here we show how to asymptotically predict the behaviour of the slip particle (its so-called resistance matrix) when each local slip length remains small compared to the particle length case (for most encountered applications this assumption is well satisfied). The theory permits to deal with arbitrary-shaped slip particles and a general distribution of slip (as the one on the first sphere in the picture). Illustrating examples will be given and discussed for a spherical particle exhibiting different slip behaviours. Moreover, a special attention will be also paid to Janus-like spheres (see the second sphere in the picture) with different piecewise constant slip properties.
Contact : chaouqi.misbah@univ-grenoble-alpes.fr
Discipline évènement : (Physique)
Entité organisatrice : (LIPhy)
Nature évènement : (Séminaire)
Evènement répétitif : (Séminaire Mat. Molle/grise)
Site de l'évènement : Domaine Universitaire de St Martin d’Hères
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