FIG. 2.
The trajectories X(t) in the xy-plane of droplets with a background source–sink pair with strength ratio γ = 5 for various values of St: (a) St = 10−4, (b) St = 10−3, and (c) St = 2 × 10−3. In these plots, R = 0.001, Λ = 0.0001, and |g| = 0. The dashed circle indicates the predicted maximal distance that a droplet can travel in this regime, calculated using the inequality (14). The dashed-dotted circle indicates the maximal distance predicted by the inertia–drag balance, giving radius equal to St/R. The source is indicated by a green filled circle and the sink is indicated by a red filled circle.