Translational viscous drags of an ellipsoid straddling an interface between two fluids

Giuseppe Boniello (1, 2) , Antonio Stocco (1, 2) , Michel Gross (1, 2) , Martin In (1, 2) , Christophe Blanc (1, 2) , Maurizio Nobili (1, 2)

1 L2C - Laboratoire Charles Coulomb
2 Matière Molle

We study the dynamics of individual polystyrene ellipsoids of different aspect ratios trapped at the air-water interface. Using particle tracking and in situ vertical scanning interferometry techniques we are able to measure translational drags and the protrusion in air of the ellipsoids. We report that translational drags on the ellipsoid are unexpectedly enhanced: despite the fact that a noticeable part of the ellipsoid is in air, drags are found larger than the bulk one in water.

Domaines: Matière Molle [cond-mat.soft]; Matériaux

Giuseppe Boniello, Antonio Stocco, Michel Gross, Martin In, Christophe Blanc, et al.. Translational viscous drags of an ellipsoid straddling an interface between two fluids. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2016, 94 (1), pp.012602. ⟨10.1103/PhysRevE.94.012602⟩. ⟨hal-01355947⟩