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Numerical investigation of entrapped air pockets on pressure surges and flow structure in a pipe
Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7599-0895
Hydraulic Machinery & Environmental Engineering Dept, Polytechnic University of Bucharest, Bucharest, Romania.
2019 (English)In: Journal of Hydraulic Research, ISSN 0022-1686, E-ISSN 1814-2079Article in journal (Refereed) Epub ahead of print
Abstract [en]

This research presents a numerical investigation of two-phase flow during the expulsion of entrapped air in a non-confined pipe. A modified version of the volume of fluid (VOF) approach is employed considering the effect of compressibility in the liquid. A modification is introduced to the original approach relating the density changes in the liquid to the pressure changes using the fluid bulk modulus. The bulk modulus is also modified to consider the pipe elasticity, the air bubble entrainment and the two-phase flow regime in a pipe. Fluid–structure interaction (FSI) code is developed and used to calculate the motion of the downstream orifice wall during the impact of the water column on the pipe end wall. The numerical results of the pressure variation agree well with experimental data. The two-phase flow structure and physics behind the pressure waves are investigated. The numerical results show that to capture the amplitude and time interval of the pressure surges, the effect of FSI should be considered during the expulsion of the entrapped air. Additionally, the effects of initial air pocket size, supply pressure and orifice size on the pressure increase are investigated. The developed VOF-FSI approach can be employed as a numerical tool to investigate the transient flow during pipe filling.

Place, publisher, year, edition, pages
Taylor & Francis, 2019.
Keywords [en]
Computational fluid dynamics, entrapped air pocket, fluid–structure interaction, pressure surge, volume of fluid (VOF)
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-74904DOI: 10.1080/00221686.2019.1579112ISI: 000470385600001Scopus ID: 2-s2.0-85065166801OAI: oai:DiVA.org:ltu-74904DiVA, id: diva2:1329145
Available from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-06-25

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Cervantes, Michel

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