Friction factor and mean velocity profile for turbulent pipe flow at high Reynolds number

Abstract

The mean velocity profile and the friction factor was measured at high Reynolds number using high Reynolds number actual flow facility (Hi-Reff) at NMIJ, AIST. The Reynolds number range of this experiment is from Re_D=1.2×10⁴ to 1.8×10⁷. The Karman and additive constants of the mean velocity profile have the Reynolds number dependency for Re_D<5.0×10⁵ and they are constant for Re_D>5.0×10⁵. The Karman constants obtained from the velocity profile measurement and the friction factor measurement are completely consistent, which is 0.383, for Re_D>5.0×10⁵.