The dripping-to-jetting transitions in coaxial flows have been experimentally well studied for
systems of high interfacial tension, where the capillary number of the outer fluid and the
Weber number of the inner fluid are in control. Recent experiments have shown that in
systems of low interfacial tension, the transitions driven by the inner flow are no longer
dominated by the inertial force alone, and the viscous drag force due to the inner flow is also
quantitatively important. In the present work, we carry out numerical simulations based on …