FIG. 2. Sequence of images showing capillary-driven neck evolution and droplet formation for low-viscosity fluids

FIG. 2. Sequence of images showing capillary-driven neck evolution and droplet formation for low-viscosity fluids. (a) A sequence of simulated images of water (0 wt. %
glycerol) shows neck formation and subsequent thinning and pinch-off dynamics including the formation of the satellite drop. (b) A sequence of images shows neck radius
evolution and drop detachment for the low viscosity fluid composed of 50 wt. % glycerol in water. The time step between images is 500 µs, and the scale bar represents a
length of 1 mm for the two cases shown. The color bar shows the velocity field in units of cm/s. The addition of glycerol seems to exercise a relatively minor influence on
pinch-off dynamics despite a five-fold increase in viscosity.