Mixing in drops on a fiber with a crossflow

Drops on fibers in crossflows have complex dynamics. At an intermediate Reynolds number, the imposed crossflow leads to a wake asymmetry which induces translation along the fiber. The internal flows that are generated have much lower Reynolds number. These viscous flows are three-dimensional. We use PIV to image the flows and report on the trajectories of the fluid particles, which we aim to rationalize with analytical and numerical models for the internal flows and particle trajectories.