Effects of the surface tension γ on periodicity in the outlet channel showing the low γ (γ = 1.8 dyn cm−1, R = 50 μm, ΔP = 19400 dyn cm−2), low R (γ = 3.6 dyn cm−1, R = 25 μm, ΔP = 73800 dyn cm−2), and the baseline cases (γ = 3.6 dyn cm−1, R = 50 μm, ΔP = 32547 dyn cm−2) with μ = 0.0295 g/cm sec and α = 0.9. The low radius and low surface tension cases exhibit similar behavior; in both cases the influence of an individual droplet is reduced. Large symbols indicate transition region points.