Fig. 8. Time evolution of flow boiling with nucleation occurring inside the plug ((L/D)i = 10) at a wall temperature of 67 C (boiling point of methanol at atmospheric
condition = 65 C). Images are captured at 250 fps. The time stamp of 73 s is when the flow boiling commences inside the heated capillary tube section. Splitting of the liquid
plug in multiple smaller plugs is clearly seen.