Texture-driven elastohydrodynamic bouncing

Thibault Chastel, Philippe Gondret and Anne Mongruel : Journal of Fluid Mechanics, Volume 805 October 2016, pp. 577-590

We investigate in detail the dynamics of bouncing of a fluid-immersed solid sphere onto a textured wall at moderate Reynolds and Stokes numbers. Using high-frequency interferometric measurements, the dynamics of the sphere is resolved in time and space, before, during and after collision with the wall. The critical Stokes number for bouncing is shown to be significantly influenced by the geometry of the texture, i.e. the surface fraction and the height of the micro-pillars. A modified Hertz model is developed to take into account the influence of this texture geometry on the collision dynamics. The predicted scaling for the collision time and penetration depth of the sphere into the textured wall is found to be in good agreement with the experimental measurements.

Haut de page



À lire aussi...

Effect of friction on the peeling test at zero-degrees

S. Ponce, J. Bico, B. Roman ; Soft Matter, 11, 9281-9290, (2015) We describe the peeling of an elastomeric strip adhering to a glass plate (...) 

> Lire la suite...

Giant ripples on comet 67P/Churyumov–Gerasimenko sculpted by sunset thermal wind

Pan Jia, Bruno Andreotti, and Philippe Claudin, PNAS (2017) Abstract : Explaining the unexpected presence of dune-like patterns at the surface of (...) 

> Lire la suite...

 

Informations Pratiques

Laboratoire : 01 40 79 45 22
Directeur : Philippe Petitjeans
Administratrice : Frédérique Auger (01 40 79 45 22)
Gestionnaire : Claudette Barez (01 40 79 58 53)
Courriel : dir (arobase) pmmh.espci.fr

Nous rendre visite