Flow pattern and frictional losses in pulsating pipe flow. II  Effect of pulsating frequency on the turbulent frictional losses. III  General representation of turbulent flow pattern
Abstract
The influence of frequency on frictional losses in a pulsating turbulent pipe flow was investigated. The frictional losses estimated from flow pattern diagrams agree well with those obtained experimentally at the timeaveraged Renumber of about 57,000 and over wide ranges of both frequency and velocity amplitude ratio. As was expected, the instantaneous friction factor and the quasisteady friction factor are almost equal in the quasisteady region. In addition, a general representation of the turbulent flow pattern is given. Flow patterns are classified into three types, i.e., quasisteady, intermediate, and inertiadominant, with respect to a specified parameter.
 Publication:

JSME International Journal Series B
 Pub Date:
 December 1980
 Bibcode:
 1980JSMEB..23.2021O
 Keywords:

 Flow Distribution;
 Friction Factor;
 Oscillating Flow;
 Pipe Flow;
 Turbulent Flow;
 Equilibrium Flow;
 Flow Velocity;
 Reynolds Number;
 Shear Stress;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer