Fig. 9: Level crossing in a four-core emulsion.
From: The vortex-driven dynamics of droplets within droplets
a Time evolution of the displacement Δzcm of four cores. Drops 1 and 2 (red/plusses and green/crosses, respectively) exhibit a periodic motion in the upper part of the emulsion whereas cores 3 and 4 (blue/asterisk and pink/square) in the lower one, once a crossing has occurred. The black dotted line is a guide for the eye representing the separation between the two regions of the emulsion. Panels b and c show the positions of the internal droplets during the crossing of droplet 3. They are taken at t = 2 × 105 (a) and t = 4 × 105 (b), marked by two spots (black and yellow) in (a). A white arrow indicates the direction of motion of droplet 3.
