Abstract

Partial blockages commonly exist in water pipelines due to various physical, chemical, and biological processes, including sediment, corrosion, and biofilm. The formed blockages can result in low flowing capacity, additional energy loss, and water quality deterioration during the water conveyance process, such as urban water supply and drainage systems. This paper presents an investigation on the interaction of transient pressure waves with pipe-wall roughness and blockages in water pipelines. The analytical expression of wave propagation in a pipeline with rough blockages is firstly derived by multiscale wave perturbation analysis for transient pipe flows. The analytical results and analysis demonstrate that the wave scattering (amplitude damping and phase shifting) is dependent on the relationship between the incident wavelength and the correlation length of roughness-blockage disorders in the pipeline. The relative importance of pipe-wall roughness friction and pipe blockage constriction to wave scattering in terms of wave envelope attenuation and wave phase change is then investigated based on the analytically derived results. Two dimensionless parameters, which are functions of the properties of incident waves, pipe-wall roughness, blockage severity and range, and internal fluid conditions, are formulated to characterize such relevance and importance. For validation, the analytical results are compared with experimental data collected in this study based on a laboratory experimental test system. Finally, the key results and findings of this study are discussed for their applicability and implication to transient pipe flow modeling and pipeline condition assessment in practical applications.

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Data Availability Statement

Some or all data, models, or code generated or used during the study are available from the corresponding author by request (including analytical derivation, numerical model data, and experimental test data).

Acknowledgments

This research was supported by the Hong Kong Research Grants Council (RGC) (15201017 and 15200719) and the National Natural Science Foundation of China (51639007).

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Go to Journal of Hydraulic Engineering
Journal of Hydraulic Engineering
Volume 147Issue 2February 2021

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Received: May 10, 2020
Accepted: Aug 27, 2020
Published online: Nov 22, 2020
Published in print: Feb 1, 2021
Discussion open until: Apr 22, 2021

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Assistant Professor, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan Univ., Chengdu 610065, China; formerly, Research Associate, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hong Kong SAR 999077, China. ORCID: https://orcid.org/0000-0001-5540-8319. Email: [email protected]
Associate Professor, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong SAR 999077, China (corresponding author). ORCID: https://orcid.org/0000-0002-9200-904X. Email: [email protected]
Professor, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan Univ., Chengdu 610065, China. Email: [email protected]
Research Assistant and Ph.D. Student, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong SAR 999077, China. Email: [email protected]
Professor, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand. ORCID: https://orcid.org/0000-0001-5282-5758. Email: [email protected]

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