FRICTION FACTORS IN PULSED TURBULENT FLOW

An apparatus for investigating pulsed turbulent liquid flow in a 2 in. diam 80 ft pipeline is described. The pulsation unit was powered by compressed air with a consumption of up to 2. 7 standard cu ft/min at 35 psi gage. The pressure drop for water flowing at mean velocities of 7. 66 to 12. 28 fps has been measured, both for steady flow and for pulsed flow, at frequencies between 0. 48 and 0. 82 Hz. The experimentally measured pressure vs time curves for pulsed flow can be matched fairly closely by a solution of Euler's equation employing the friction factors measured under steady flow conditions.