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Open AccessArticle

Modeling of the Free-Surface Vortex-Driven Bubble Entrainment into Water

1
Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Fluid Dynamics, Bautzner Landstr. 400, 01328 Dresden, Germany
2
Department of Mechanical & Industrial Engineering, Faculty of Engineering, Universitas Gadjah Mada, Jalan Grafika No. 2, Yogyakarta 55281, Indonesia
*
Author to whom correspondence should be addressed.
Water 2020, 12(3), 709; https://doi.org/10.3390/w12030709
Received: 20 December 2019 / Revised: 13 February 2020 / Accepted: 3 March 2020 / Published: 5 March 2020
(This article belongs to the Section Hydraulics and Hydrodynamics)
The recently developed GENTOP (Generalized Two Phase Flow) concept, which is based on the multifield Euler‒Euler approach, was applied to model a free-surface vortex—a flow situation that is relevant for hydraulic intake. A new bubble entrainment model has been developed and implemented in the concept. In general, satisfactory agreement with the experimental data can be achieved. However, the gas entrainment can be significantly affected by several parameters or models used in the CFD (Computational Fluid Dynamics) simulation. The scale of curvature correction C s c a l e in the turbulence model, the coefficient in the entrainment model C e n t , and the assigned bubble size to be entrained have a significant influence on the gas entrainment rate. The gas entrainment increases with higher C s c a l e values, which can be attributed to the stronger rotation captured by the simulation. A smaller bubble size gives higher gas entrainment, while a larger bubble size leads to a smaller entrainment. The results also show that the gas entrainment can be controlled by adjusting the entrainment coefficient C e n t . Based on the modeling framework presented in this paper, further improvement of the physical modeling of the entrainment process should be done. View Full-Text
Keywords: multiphase flow; bubble entrainment; free-surface vortex; rotating flow; GENTOP multiphase flow; bubble entrainment; free-surface vortex; rotating flow; GENTOP
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MDPI and ACS Style

Putra, R.A.; Lucas, D. Modeling of the Free-Surface Vortex-Driven Bubble Entrainment into Water. Water 2020, 12, 709. https://doi.org/10.3390/w12030709

AMA Style

Putra RA, Lucas D. Modeling of the Free-Surface Vortex-Driven Bubble Entrainment into Water. Water. 2020; 12(3):709. https://doi.org/10.3390/w12030709

Chicago/Turabian Style

Putra, Ryan A.; Lucas, Dirk. 2020. "Modeling of the Free-Surface Vortex-Driven Bubble Entrainment into Water" Water 12, no. 3: 709. https://doi.org/10.3390/w12030709

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