Figure 7.

Approximate droplet shapes used for theoretical calculations of droplet motion on slender electrode arrays (a–d). For each sequence droplet footprint area consists of an elliptical front part (shaded in violet), rectangular middle part (shaded in light orange) and half circular back part (shaded in sky blue). Letters a and b denote the major and minor axis of the ellipse, L and W denote length and width of the rectangle, and r is the radius of the half circular part. The red outlines show the activated electrodes and the shaded portion shows the transition distance.