Fig. 3.

Experimental data showing the dependence of I_in/I_out on the two dimensionless parameters: shear stress ratio ζ and relative droplet size λ. The slope of the least square fitting line (black line) between I_in/I_out and log₁₀(ζ^0.55/λ^0.82) is 0.92. The ratio of q_shell/q_core = 0.2 for all experiments. Upper left inset: I_in/I_out ~ 0.55 log₁₀(ζ) for constant λ, I_in/I_out ~ −0.82 log₁₀(λ) for constant ζ. Insets of fluorescence images: microdroplets generated with various combinations of ζ and λ.