Texture-driven elastohydrodynamic bouncing

被引:10
作者
Chastel, Thibault [1 ,2 ,3 ,4 ]
Gondret, Philippe [5 ]
Mongruel, Anne [1 ,2 ,3 ,4 ]
机构
[1] CNRS, UMR 7636, Lab Phys & Mecan Milieux Heterogenes PMMH, 10 Rue Vauquelin, F-75005 Paris, France
[2] ESPCI, PSL, 10 Rue Vauquelin, F-75005 Paris, France
[3] Univ Paris 06, Sorbonne Univ, F-75252 Paris 05, France
[4] Univ Paris 07, Sorbonne Paris Cite, UDD, F-75221 Paris 05, France
[5] Univ Paris Saclay, Univ Paris 11, CNRS, Lab FAST, F-91405 Orsay, France
关键词
multiphase and particle-laden flows; particle/fluid flow; PARTICLE-WALL COLLISIONS; SPHERE; LUBRICATION; CONTACT; MOTION;
D O I
10.1017/jfm.2016.580
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
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.
引用
收藏
页码:577 / 590
页数:14
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