Figure 4: Size of daughter droplets as a function of experimental parameters.

(a) Geometry when the mother droplet is pinned at the outer radius of the capillary. The shapes were extracted from video images. (b,c) Experimental daughter drop sizes. (d) Geometry when the mother droplet is pinned at the inner radius of the capillary. (e,f) Experimental daughter drop sizes. The size of the symbol in b and e is proportional to the size of the daughter droplets, and the abscissa is given as dimensionless Ohnesorge number Oh=μ₂[(ρ₁+ρ₂)σ₁₂R_m]^−½ comparing viscous, inertial and interfacial forces. (c,f) The linear relationship between R_d and (μ₂Q/σ₁₂)^1/2. Crosses indicated dispensing under formation of several droplets of similar sizes (transition regime) where R_d is the average radius of the several droplets formed due to the break-up of the thin liquid filaments.