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Fluids 2016, 1(3), 29; doi:10.3390/fluids1030029

Baseline Model for Bubbly Flows: Simulation of Monodisperse Flow in Pipes of Different Diameters

1
Helmholtz-Zentrum Dresden—Rossendorf, Institute of Fluid Dynamics, P.O. Box 510119, D-01314 Dresden, Germany
2
CIC Virtuhcon, Technische Universität Bergakademie Freiberg, Fuchsmühlenweg 9, D-09599 Freiberg, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Asterios Pantokratoras
Received: 21 June 2016 / Revised: 11 August 2016 / Accepted: 24 August 2016 / Published: 1 September 2016
(This article belongs to the Special Issue Computational Fluid Dynamics)
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Abstract

CFD simulations of the multiphase flow in technical equipment are feasible within the framework of interpenetrating continua, the so-called two-fluid modelling. Predictions with multiphase CFD are only possible if a fixed set of closures for the interfacial exchange terms is available that has been validated for a wide range of flow conditions and can therefore reliably be used also for unknown flow problems. To this end, a baseline model, which is applicable for adiabatic bubbly flow, has been specified recently and has been implemented in OpenFOAM. In this work, we compare simulation results obtained using the baseline model with three different sets of experimental data for dispersed gas-liquid pipe flow. Air and water under similar flow conditions have been used in the different experiments, so that the main difference between the experiments is the variation of the pipe diameter from 25 mm to 200 mm. Gas fraction and liquid velocity are reasonably well reproduced, in particular in the bulk of the flow. Discrepancies can be seen in the turbulent kinetic energy, the gas velocity and in the wall peaks of the gas fraction. These can partly be explained by the simplified modelling, but to some extent must be attributed to uncertainty in the experimental data. The need for improved near-wall modelling, turbulence modelling and modelling of the bubble size distribution is highlighted. View Full-Text
Keywords: dispersed gas liquid multiphase flow; Euler-Euler two-fluid model; closure relations; CFD simulation; model validation; OpenFOAM dispersed gas liquid multiphase flow; Euler-Euler two-fluid model; closure relations; CFD simulation; model validation; OpenFOAM
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kriebitzsch, S.; Rzehak, R. Baseline Model for Bubbly Flows: Simulation of Monodisperse Flow in Pipes of Different Diameters. Fluids 2016, 1, 29.

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