Abstract
Much research on small bubbles and complex liquids and their drag reduction effect has been reported.Few studies have focused on nanobubbles.Nanobubble mixtures for water and glycerol were passed through several sizes of capillaries,and the resultant coefficient of pipe losses,as compared with water and glycerol,were evaluated in this study.For small capillaries,the investigated coefficients were less than water ones.This phenomenon is considered in terms of interface behavior and attributed to the electrical interaction between an electric double layer and nanobubbles.The results of the present study suggest that the addition of nanobubbles to a liquid results in excellent drag reduction.
