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research-article

Radial pressure wave behavior in transient laminar pipe flows under different flow perturbations

[+] Author and Article Information
Tong-Chuan Che

Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China
tong-chuan.che@connect.polyu.hk

HF Duan

Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China
hf.duan@polyu.edu.hk

Pedro Lee

Department of Civil and Natural Resources Engineering, The University of Canterbury, Private Bag 4800, Christchurch, New Zealand
pedro.lee@canterbury.ac.nz

Silvia Meniconi

Department of Civil and Environmental Engineering, University of Perugia, 06125 Perugia, Italy
silvia.meniconi@unipg.it

Bin Pan

Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China
bin.pan@connect.polyu.hk

Bruno Brunone

Department of Civil and Environmental Engineering, University of Perugia, 06125 Perugia, Italy
bruno.brunone@unipg.it

1Corresponding author.

ASME doi:10.1115/1.4039711 History: Received December 06, 2017; Revised March 07, 2018

Abstract

The study of transient pressure waves in both low and high frequency domains has been a new research area to provide potentially high-resolution pipe fault detection methods. In previous research works, radial pressure waves were evidently observed after stopping the laminar pipe flows by valve closures, but the generation mechanism and components of these radial pressure waves are unclear. This paper intends to clarify this phenomenon. To this end, this study firstly addresses the inefficiencies of the current numerical scheme for the full two-dimensional (full-2D) water hammer model. The modified efficient full-2D model is then implemented into a practical reservoir-pipeline-valve system, which is validated by the well-established analytical solutions. The generation mechanism and components of the radial pressure waves, caused by different flow perturbations from valve operations, in transient laminar flows are investigated systematically using this efficient full-2D model. The results indicate that non-uniform changes in the initial velocity profile form pressure gradients along the pipe radius. The existence of these radial pressure gradients is the driving force of the formation of radial flux and radial pressure waves. In addition, high radial modes can be excited, and the frequency of flow perturbations by valve oscillation can redistribute the energy entrapped in each high radial mode.

Copyright (c) 2018 by ASME
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