CFD modeling of bubble-induced turbulence

•New proposal of source terms in k–ε model describing bubble-effects on turbulence.•Comparison of several models for bubble-induced turbulence.•Validation of the models with an experimental database.•Identification of suitable closure for bubbly turbulence.•Enables prediction of turbulent kinetic en...

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Bibliographic Details
Published in:International journal of multiphase flow Vol. 55; pp. 138 - 155
Main Authors: Rzehak, Roland, Krepper, Eckhard
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01.10.2013
Elsevier
Subjects:
Bubble induced turbulence
Bubbles
CFD simulation
Computational fluid dynamics
Computational methods in fluid dynamics
Dispersed gas liquid multiphase flow
Euler Euler two fluid model
Exact sciences and technology
Fluid dynamics
Fluid flow
Fundamental areas of phenomenology (including applications)
Guidelines
Mathematical models
Model validation
Multiphase and particle-laden flows
Multiphase flow
Nonhomogeneous flows
Physics
Turbulence
Turbulent flow
Bubble induced turbulence
CFD simulation
Dispersed gas liquid multiphase flow
Euler Euler two fluid model
Model validation
Gas liquid interface
Computational fluid dynamics
Digital simulation
Two fluid model
Void fraction
Phase velocity
Two-phase flow
Modelling
Bubble flow
Turbulence structure
ISSN:0301-9322, 1879-3533
Online Access:Get full text
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Summary:•New proposal of source terms in k–ε model describing bubble-effects on turbulence.•Comparison of several models for bubble-induced turbulence.•Validation of the models with an experimental database.•Identification of suitable closure for bubbly turbulence.•Enables prediction of turbulent kinetic energy and dissipation including bubble effects. Modeling of bubble-induced turbulence in dispersed gas–liquid multiphase flow is an important but still unresolved issue. Aside from its intrinsic interest, turbulence in this type of flow has a strong impact on other important processes like turbulent dispersion of the bubbles and bubble-coalescence and -breakup and thus is a central part of the overall model. Especially the latter require as input values of turbulent kinetic energy and dissipation, which as shown subsequently are not readily obtained from the most common approach to add a bubble-induced contribution to the effective viscosity. This may be overcome by including source terms in the single phase two-equation turbulence models that describe the bubble effects on the liquid turbulence. However, no consensus on the precise form of these terms has been reached yet. We here report a comparison of different models of this type. Special care has been given to the selection of a rather comprehensive set of reference data allowing to qualify the validity of the different models. Conclusions towards best practice guidelines for modeling bubbly turbulence are drawn and needs for further research identified.
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ISSN:0301-9322
1879-3533
DOI:10.1016/j.ijmultiphaseflow.2013.04.007