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27 janvier 2020: 1 événement

  • Séminaires Invités

    Lundi 27 janvier 14:00-15:30 - Antoine SELLIER - Ladhyx, Ecole Polytechnique, Paris

    About Slip Particles : Case of the Anisotropic Inhomogeneous Navier Condition

    Résumé : 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. 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 with different piecewise constant slip properties.

    contact : Chaouqi Misbah

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères

    En savoir plus : Séminaires Invités