Figure 3.

Size and production frequency of water droplets in mineral oil as a function of the continuous and dispersed flow rates $Q_c$ and $Q_d$, respectively, for the parameters given in Table 1, with (a) couple 1 and (b) couple 2 for the geometries. The values of the capillary numbers for the dispersed and continuous phases, as defined in Eq. (9) and with ${\mathrm{Ca}}_d=\overline{Q}{\mathrm{Ca}}_c$, are also given on the right and top axes, respectively. The dashed lines separate the dripping to jetting regimes. In the case the jetting regime is reached for high $Q_c$ in the region on the right of the red dashed line in (b), it still makes sense to plot the data because of a weak polydispersity characterized by a coefficient of variation (CV) around 4%.