Bouncing jet: A Newtonian liquid rebounding off a free surface

Bouncing jet: a Newtonian liquid rebounding off a free surface.

We find that a liquid jet can bounce off a bath of the same liquid if the bath is moving horizontally with respect to the jet. Previous observations of jets rebounding off a bath (e.g., the Kaye effect) have been reported only for non-Newtonian fluids, while we observe bouncing jets in a variety of Newtonian fluids, including mineral oil poured by hand. A thin layer of air separates the bouncin...

Stable Liquid Jets Bouncing off Soft Gels.

A liquid jet can stably bounce off a sufficiently soft gel by following the contour of the dimple created upon impact. This new phenomenon is insensitive to the wetting properties of the gels and was observed for different liquids over a wide range of surface tensions, γ=24-72  mN/m. In contrast, other jet rebound phenomena are typically sensitive to γ: only a high γ jet rebounds off a hard sol...

Modelling Film Drainage of a Bubble Hitting and Bouncing off a Surface

A theoretical model assuming lubrication theory has been developed for the interaction of bubbles rising under gravity against a glass plate. This system provides modelling challenges due to large deformations and widely different length scales where bubbles of micrometre to millimetre size form films that are on the nanometre range. Numerical simulations agree well with experimental data and r...

A Bose-Einstein condensate bouncing off a rough mirror

Free surface instability in a confined suspension jet

A suspension confined between two close parallel plates is studied in the Stokesian regime. The use of boundary integral equations and the lubrication approximation allows to compute the hydrodynamic forces acting on the particles. The forces are long ranged and depend on the orientation of the relative position and velocity of particles. This tensorial character predicts an ‘‘antidrag’’ that i...