Effect of Surface Wettability and Dryout

In order to examine how two-phase flow patterns in small channels are sensitive to surface contamination, Serizawa et al. (2002) observed visually the flow patterns 

S Slug flow with liquid droplets sticking on I me wall 

Liquid droplets on the lube wall within gas slug 

The effect of surface contamination and the wettability between the tube wall and the fluids were also studied experimentally. It has been shown that a stable annular flow and gas slug formation with a stable thin liquid film formed between the tube wall and gas slugs, which appeared at high velocities under carefully treated, clean 

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