On the breakup of fluid particles in turbulent flows

Andersson, Ronnie; Andersson, Bengt

doi:10.1002/aic.10831

Cited by 216 publications

(235 citation statements)

References 17 publications

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“…Andersson and Andersson (2006) observed single droplet breakup with a high speed camera and concluded that equal sized breakup is the most probable. In this work the daughter droplet size distribution function was assumed to be a uniform probability function, meaning that the droplets obtained after a breakage event have the same size.…”

Section: The Daughter Droplet Size Distribution Functionmentioning

confidence: 99%

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Population balances combined with Computational Fluid Dynamics: A modeling approach for dispersive mixing in a high pressure homogenizer

Dubbelboer

Janssen

Hoogland

et al. 2014

Chemical Engineering Science

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Section: The Daughter Droplet Size Distribution Functionmentioning

confidence: 99%

“…In turbulent flows viscous droplets were shown to stretch to long threads, up to 20 times the initial droplet diameter (Andersson and Andersson, 2006). The thread diameter then becomes $ 0.18d, based on the conservation of volume.…”

Section: The Daughter Droplet Size Distribution Functionmentioning

confidence: 99%

Population balances combined with Computational Fluid Dynamics: A modeling approach for dispersive mixing in a high pressure homogenizer

Dubbelboer

Janssen

Hoogland

et al. 2014

Chemical Engineering Science

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“…It is not absolutely clear which of the models accurately represents realistic behaviour as evidenced by the published experimental results on bubble breakup, which are sometimes contradictory. Hesketh et al (1991) and Andersson and Andersson (2006) claim that binary breakup is the most probable event for bubble breakup, while Risso and Fabre (1998) observed breakups that formed more than ten fragments.…”

Section: Introductionmentioning

confidence: 99%

Modelling of the Bubble Size Distribution in an Aerated Stirred Tank: Theoretical and Numerical Comparison of Different Breakup Models

Kálal¹,

Jahoda²,

Fořt³

2014

Chemical and Process Engineering

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The main topic of this study is the mathematical modelling of bubble size distributions in an aerated stirred tank using the population balance method. The air-water system consisted of a fully baffled vessel with a diameter of 0.29 m, which was equipped with a six-bladed Rushton turbine. The secondary phase was introduced through a ring sparger situated under the impeller. Calculations were performed with the CFD software CFX 14.5. The turbulent quantities were predicted using the standard k-ε turbulence model. Coalescence and breakup of bubbles were modelled using the MUSIG method with 24 bubble size groups. For the bubble size distribution modelling, the breakup model by Luo and Svendsen (1996) typically has been used in the past. However, this breakup model was thoroughly reviewed and its practical applicability was questioned. Therefore, three different breakup models by Martínez-Bazán et al. (1999a, b), Lehr et al. (2002) and Alopaeus et al. (2002) were implemented in the CFD solver and applied to the system. The resulting Sauter mean diameters and local bubble size distributions were compared with experimental data.

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“…Although, the possibility of non-binary breakage for liquid-liquid systems may occur where 261 internal viscosity of the dispersed phase can produce multiple daughter drops, the assumption of 262 binary breakage is still valid as air viscosity is low and thus the bubbles cannot form an extremely 263 elongated shape (Andersson and Andersson, 2006 agitated using a Rushton turbine was adopted for both the validation and multi-compartment 272 modelling. The stirred tank is considered to be operating in a fully dispersed regime (N > N CD ) for 273 better gas dispersion.…”

mentioning

confidence: 99%

Three-Way Coupling Simulation of a Gas-Liquid Stirred Tank using a Multi-Compartment Population Balance Model

Gimbun

Liew

Nagy

et al. 2016

Chemical Product and Process Modeling

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Modelling of gas-liquid stirred tanks is very challenging due to the presence of strong bubble-liquid interactions. Depending upon the needs and desired accuracy, the simulation may be performed by considering one-way, two-way, three-way or four-way coupling between the primary and secondary phase. Accuracy of the prediction on the two-phase flow generally increases as the details of phase interactions increase but at the expense of higher computational cost. This study deals with two-way and three-way coupling of gas-liquid flow in stirred tanks which were then compared with results via four-way coupling. Population balance model (PBM) based on quadrature method of moments (QMOM) was implemented in a multi-compartment model of an aerated stirred tank to predict local bubble size. The multi-compartment model is regarded as three-way coupling because the local turbulent dissipation rates and flow rates were obtained from a two-way computational fluid dynamics (CFD) simulation. The predicted two-phase flows and local bubble size showed good agreement with experimental data.

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On the breakup of fluid particles in turbulent flows

Cited by 216 publications

References 17 publications

Population balances combined with Computational Fluid Dynamics: A modeling approach for dispersive mixing in a high pressure homogenizer

Population balances combined with Computational Fluid Dynamics: A modeling approach for dispersive mixing in a high pressure homogenizer

Modelling of the Bubble Size Distribution in an Aerated Stirred Tank: Theoretical and Numerical Comparison of Different Breakup Models

Three-Way Coupling Simulation of a Gas-Liquid Stirred Tank using a Multi-Compartment Population Balance Model

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