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Experiments and CFD modeling of high-velocity two-phase flows in a large chute aerator facility
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure. (Division of Concrete Structures)ORCID iD: 0000-0002-4242-3824
KTH, School of Architecture and the Built Environment (ABE). (Hydraulic and Hydrologic Engineering)ORCID iD: 0000-0001-7631-3503
Institute of Water Resources and Hydropower Research (IWHR). (Department of Hydraulics)
2019 (English)In: Engineering Applications of Computational Fluid Mechanics, ISSN 1994-2060, E-ISSN 1997-003X, Vol. 13, no 1, p. 48-66Article in journal (Refereed) Published
Abstract [en]

Mathematical formulations of two-phase flows at an aerator remain a challenging issue for spillwaydesign. Due to their complexities in terms of water–air interactions subjected to high flow velocities,experiments play an essential role in evaluations of numerical models. The paper focuses on theunderlying influence of the air–water momentum exchange in the two-phase Two-Fluid Model. Itis modified to better represent the drag force acting on a group of air bubbles and the wall lubricationforce accounting for near-wall phase interactions. Based on data from a large aerator rig withan approach velocity of 14.3 m/s, the models are evaluated for calculations of entrained air characteristicsof a flow mixture. The air bubble diameter used in the modeling ranges from 0.5 to 4mmassuggested by the experiments. In terms of air cavity configurations and aerator air demand, smallerair bubbles lead to better agreement with the test results. As far as air concentrations are concerned,the modified model gains by comparison. In the air cavity zone, smaller bubble sizes also provide bettermatches with the experiments. However, the near-base air concentration remains overestimateddownstream from the impact area. The fact that the program user must pre-define a single air bubblesize in simulations presumably limits the correct reproduction of near-base air concentrations andof their decay.

Place, publisher, year, edition, pages
2019. Vol. 13, no 1, p. 48-66
Keywords [en]
aerator; two-phase flow; two-fluid model; drag force; wall lubrication force; air cavity
National Category
Water Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-258937DOI: 10.1080/19942060.2018.1552201ISI: 000451548900001Scopus ID: 2-s2.0-85063395379OAI: oai:DiVA.org:kth-258937DiVA, id: diva2:1350424
Note

QC 20190923

Available from: 2019-09-11 Created: 2019-09-11 Last updated: 2019-09-23Bibliographically approved

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