Research Article
Nov 1973
Friction–Frequency Dependence for Oscillatory Flows in Circular Pipe
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VIEW THE REPLYAuthors: Hemmat H. Safwat and Jaap v. d. PolderAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 99, Issue 11
Abstract
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.
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Journal of the Hydraulics Division
Volume 99 • Issue 11 • November 1973
Pages: 1933 - 1945
Copyright
© 1973 American Society of Civil Engineers.
History
Published in print: Nov 1973
Published online: Feb 3, 2021
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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
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