Abstract
New experimental data and new equation of friction factor in a fully developed turbulent pipe flow at high Reynolds number is presented in this paper. The experiments are performed using the water flow test facility for high Reynolds number in NMIJ, AIST. The Reynolds number range examined is from 4.69 X 104 to 1.77 X 107. The experimental friction factors are smaller than those by the Prandtl equation in high Reynolds number region, Re>1.0 X 105 and those do not agree with the previous experiment. Finally, new equation for the friction factor based on the experimental results is proposed.
