Wall Shear Stress in Pulsating Pipe Flow at Resonance Conditions

Jurij Gregorc (Corresponding author), Anton Bergant, Kamil Urbanowicz, Arris Tijsseling

Research output: Contribution to journalConference articlepeer-review

Abstract

Hydraulic vibrations in liquid-filled pipelines may cause unwanted operational problems. Wall shear stress and consequential damping can reduce the harmful effects of vibrations close to resonance. A large-scale pipeline apparatus at Deltares, Delft, The Netherlands, has been used for pulsating pipe flow tests. The apparatus consists of a constant-head tank, a horizontal 206 mm diameter 49 meters long steel pipe and an oscillating valve at the downstream end. Wall shear stress has been measured by a number of hot-film sensors. Tests have been performed with an average flow Reynolds number of about 22,000. Results of a hydraulic resonance case with oscillating frequency fex = 5 Hz are presented. Pipe wall vibrations for this case are small. The shape of the velocity profile at resonance conditions is a typical unsteady-state velocity profile with reverse flow near the pipe wall. The CFD study in an axisymmetric domain was conducted to better understand the pulsating flow phenomena. Different settings of boundary conditions, based on the experimental investigations, were used. The CFD results show the unsteady character of wall shear stress at resonance. This phenomenon has not been observed in the measured results to such an extent. The measured shear stress resembles quasi-steady behaviour.

Original languageEnglish
Article number012023
Number of pages6
JournalIOP Conference Series: Earth and Environmental Science
Volume405
DOIs
Publication statusPublished - 20 Dec 2019
Event8th IAHR International Workshop on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems, IAHR 2019 - Stuttgart, Germany
Duration: 9 Oct 201911 Oct 2019

Fingerprint Dive into the research topics of 'Wall Shear Stress in Pulsating Pipe Flow at Resonance Conditions'. Together they form a unique fingerprint.

Cite this