Abstract
The pressure loss characteristics of a dispersion liquid flow containing the organic nanotube in the circular pipe are investigated experimentally. The volumetric flow rate and the pressure difference are measured. The dispersion concentrations of 1000 to 6000ppm are examined Up to the concentration of 3000ppm, the drag reduction increases with an increase of concentrations. At the concentration of more than 3000ppm, however, the drag reduction becomes almost constant, in spite of an increase of the concentration, i.e. saturated. As the Reynolds number increases, the drag reduction decreases. In addition, the electron microscope observation shows that the network structure of the organic nanotube in the dispersion liquid hardly alters after 42 days.
