Fig. 6

Oil–water segmented flow at the needle-inserted channel: (a) Flow images of oil–water segmented flow depending on the water flow rate (Qw = 0.1–1.0 (mL/min)). (b) A plot of water and oil size at Qw = 0.1–0.7 (mL/min).

Oil–water segmented flow at the needle-inserted channel: (a) Flow images of oil–water segmented flow depending on the water flow rate (Qw = 0.1–1.0 (mL/min)). (b) A plot of water and oil size at Qw = 0.1–0.7 (mL/min).