Figure 2.

Pressure drop in a constriction between inlet and outlet with $\mathsf{{\rm X}}=1$ and $\mathrm{Ca}=0.1$. $L_e^d$ is the entry length (i.e., the moving distance of the droplet since it enters the constriction until the pressure becomes constant), $w$ the constriction microchannel width, and $y_c$ the centre position of the moving droplet along the microchannel. Reproduced with permission from [46].