Pressure and Velocity Distributions in Pulsating Turbulent Pipe Flow Part 2 Experimental Investigations

Abstract

Pressure and velocity of pulsating turbulent air and water flows in circular pipes generated by rotary valves were measured by the use of a strain-gauge-type pressure transducer and a hot-wire anemometer, respectively (0.0432 <= f <= 48.0 Hz, 7740 <= Re <= 95900). Comparisons of experimental data with approximate solutions derived from a four-region model for a pulsating turbulent flow in a circular pipe containing a slightly compressible fluid show that : (i) Cross-sectional distribution of time-averaged velocities agrees well with that of steady flow velocities. (ii) Cross-sectional distribution profiles of oscillating velocity coincide well with the above-mentioned theoretical ones, and therefore, depend only on the Reynolds number and the dimensionless angular frequency w'=R2w/v, where R is pipe radius, w angular frequency, v kinematic viscosity. (iii) Axial distributions of oscillating pressures and velocities on the pipe axis also agree well with the above-mentioned theoretical ones within the frequency range of 0.1 <= f <=48.0 Hz.