Friction—Frequency Dependence for Oscillatory Flows in Circular Pipe

by Hemmat H. Safwat, Principal Investigator; Lab. of Thermal Power Engrg., Mech. Engrg. Dept., Delft Univ. of Tech., Delft, The Netherlands,
Jaap v. d. Polder, Engr.; Gemeentelijk Energle Bedrijf, Rotterdam, The Netherlands,

Serial Information: Journal of the Hydraulics Division, 1973, Vol. 99, Issue 11, Pg. 1933-1945

Document Type: Journal Paper


Measured data of velocity changes in oscillatory flows (0.16–0.36Hz) are presented. The actual wall shear stresses obtained from these measurements are compared to calculated values based on steady flow relations and Zielke's model. A new model for the prediction of the wall shear stress as a function of velocity and acceleration changes is introduced. The proposed model may be a suitable basis for the prediction of friction data for one-dimensional flow analysis under nonsteady conditions.

Subject Headings: Flow measurement | Shear walls | Shear stress | Friction | Oscillations | Pipe flow | Oscillatory flow | Pipelines

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