The study of transient pressure waves in both low- and high-frequency domains has become 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 first 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 (RPV) 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 nonuniform 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.
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October 2018
Research-Article
Radial Pressure Wave Behavior in Transient Laminar Pipe Flows Under Different Flow Perturbations
Tong-Chuan Che,
Tong-Chuan Che
Department of Civil and
Environmental Engineering,
The Hong Kong Polytechnic University,
Hong Kong 999077, China
e-mail: tong-chuan.che@connect.polyu.hk
Environmental Engineering,
The Hong Kong Polytechnic University,
Hong Kong 999077, China
e-mail: tong-chuan.che@connect.polyu.hk
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Huan-Feng Duan,
Huan-Feng Duan
Department of Civil and
Environmental Engineering,
The Hong Kong Polytechnic University,
Hong Kong 999077, China
e-mail: hf.duan@polyu.edu.hk
Environmental Engineering,
The Hong Kong Polytechnic University,
Hong Kong 999077, China
e-mail: hf.duan@polyu.edu.hk
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Pedro J. Lee,
Pedro J. Lee
Department of Civil and Natural
Resources Engineering,
The University of Canterbury,
Private Bag,
Christchurch 4800, New Zealand
e-mail: pedro.lee@canterbury.ac.nz
Resources Engineering,
The University of Canterbury,
Private Bag,
Christchurch 4800, New Zealand
e-mail: pedro.lee@canterbury.ac.nz
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Silvia Meniconi,
Silvia Meniconi
Department of Civil and
Environmental Engineering,
University of Perugia,
Perugia 06125, Italy
e-mail: silvia.meniconi@unipg.it
Environmental Engineering,
University of Perugia,
Perugia 06125, Italy
e-mail: silvia.meniconi@unipg.it
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Bin Pan,
Bin Pan
Department of Civil and
Environmental Engineering,
The Hong Kong Polytechnic University,
Hong Kong 999077, China
e-mail: bin.pan@connect.polyu.hk
Environmental Engineering,
The Hong Kong Polytechnic University,
Hong Kong 999077, China
e-mail: bin.pan@connect.polyu.hk
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Bruno Brunone
Bruno Brunone
Department of Civil and
Environmental Engineering,
University of Perugia,
Perugia 06125, Italy
e-mail: bruno.brunone@unipg.it
Environmental Engineering,
University of Perugia,
Perugia 06125, Italy
e-mail: bruno.brunone@unipg.it
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Tong-Chuan Che
Department of Civil and
Environmental Engineering,
The Hong Kong Polytechnic University,
Hong Kong 999077, China
e-mail: tong-chuan.che@connect.polyu.hk
Environmental Engineering,
The Hong Kong Polytechnic University,
Hong Kong 999077, China
e-mail: tong-chuan.che@connect.polyu.hk
Huan-Feng Duan
Department of Civil and
Environmental Engineering,
The Hong Kong Polytechnic University,
Hong Kong 999077, China
e-mail: hf.duan@polyu.edu.hk
Environmental Engineering,
The Hong Kong Polytechnic University,
Hong Kong 999077, China
e-mail: hf.duan@polyu.edu.hk
Pedro J. Lee
Department of Civil and Natural
Resources Engineering,
The University of Canterbury,
Private Bag,
Christchurch 4800, New Zealand
e-mail: pedro.lee@canterbury.ac.nz
Resources Engineering,
The University of Canterbury,
Private Bag,
Christchurch 4800, New Zealand
e-mail: pedro.lee@canterbury.ac.nz
Silvia Meniconi
Department of Civil and
Environmental Engineering,
University of Perugia,
Perugia 06125, Italy
e-mail: silvia.meniconi@unipg.it
Environmental Engineering,
University of Perugia,
Perugia 06125, Italy
e-mail: silvia.meniconi@unipg.it
Bin Pan
Department of Civil and
Environmental Engineering,
The Hong Kong Polytechnic University,
Hong Kong 999077, China
e-mail: bin.pan@connect.polyu.hk
Environmental Engineering,
The Hong Kong Polytechnic University,
Hong Kong 999077, China
e-mail: bin.pan@connect.polyu.hk
Bruno Brunone
Department of Civil and
Environmental Engineering,
University of Perugia,
Perugia 06125, Italy
e-mail: bruno.brunone@unipg.it
Environmental Engineering,
University of Perugia,
Perugia 06125, Italy
e-mail: bruno.brunone@unipg.it
1Corresponding author.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received December 6, 2017; final manuscript received March 7, 2018; published online May 2, 2018. Assoc. Editor: Ning Zhang.
J. Fluids Eng. Oct 2018, 140(10): 101203 (13 pages)
Published Online: May 2, 2018
Article history
Received:
December 6, 2017
Revised:
March 7, 2018
Citation
Che, T., Duan, H., Lee, P. J., Meniconi, S., Pan, B., and Brunone, B. (May 2, 2018). "Radial Pressure Wave Behavior in Transient Laminar Pipe Flows Under Different Flow Perturbations." ASME. J. Fluids Eng. October 2018; 140(10): 101203. https://doi.org/10.1115/1.4039711
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