Drop dynamics plays a central role in defining the interfacial morphology in two-phase complex fluids such as emulsions and polymer blends. In such materials, the components are often microstructured complex fluids themselves. To model and simulate drop behavior in such systems, one has to deal with the dual complexity of non-Newtonian rheology and evolving interfaces. Recently, we developed a ...

Drop coalescence occurs through the rapid growth of a liquid bridge that connects two drops. At early times after contact, dynamics is typically self-similar, with details depending on geometry and viscosity liquid. In this paper we analyse two-dimensional viscous drops float quiescent deep pool; such are called lenses. The analysis based thin-sheet equations, which were recently shown to accur...

Contents Introduction: Drop coalescence and applications; Effect of inter-phase mass transfer. • Inter-phase transport of solutes-convection-diffusion equations in the phases. Numerical method: • Boundary Integral Method for the Stokes equations in the drops; • Finite Difference Method for the flow in the film and the convection-diffusion equations.

The addition of polymers is known to fundamentally affect capillary singularities such as drop pinch-off. In this study, we wonder how polymeric drops spread onto a solid. Although the dynamics liquid bridge connecting solid similar that pure water, find interface gets significantly sharper, which quantified by measuring curvature bridge. These findings are reminiscent what found for coalescenc...

When a drop of a viscous fluid is deposited on a bath of the same fluid, it is shown that its coalescence with this substrate is inhibited if the system oscillates vertically. Small drops lift off when the peak acceleration of the surface is larger than g. This leads to a steady regime where a drop can be kept bouncing for any length of time. It is possible to inject more fluid into the drop to...