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

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 ReD=1.2×104 to 1.8×107. The Karman and additive constants of the mean velocity profile have the Reynolds number dependency for ReD<5.0×105 and they are constant for ReD>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 ReD>5.0×105.