Hydrodynamics of annular centrifugal contactors: A CFD analysis using a novel multiphase flow modelling approach

Santis, Andrea De; Hanson, Bruce; Fairweather, Michael

doi:10.1016/j.ces.2021.116729

Cited by 12 publications

(11 citation statements)

References 32 publications

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“…The authors demonstrated the capability of the model to capture a liquid-liquid extraction and predict the mass-transfer efficiency in such a device. Similar development was made by De Santis et al [6] to describe a similar process. In addition, a reduced population balance approach was implemented in order to determine the accurate droplet size distribution in the dispersed flow regimes.…”

Section: Introductionsupporting

confidence: 58%

Computational modelling of the separation of molten polymer blends by a centrifugal technique

Medvid¹,

Steiner²,

Irrenfried³

et al. 2023

Preprint

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Computational modelling of a centrifugal technique for separating binary mixtures of thermoplastic polymers in the molten state is presented. The technique may be useful for the recycling of polymeric materials. The study investigates the physical process of component separation due to the centrifugal force in a batch process, showing the potential of using a dispersed model for describing the complex mechanism underlying the technique. Given the long time scales of change of the flow field, the polymer melts are modelled as inelastic, shearthinning materials. The centrifugal force drives the component with the higher density to the outer region of an annular cross section occupied by the melt inside a rotating containment. The model system PET/LDPE is investigated in detail. The simulations allow to predict the process time needed for the separation. The simulations are the basis for studying a continuous process in a rotating tube.

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Section: Introductionsupporting

confidence: 58%

Computational modelling of the separation of molten polymer blends by a centrifugal technique

Medvid¹,

Steiner²,

Irrenfried³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Although implementing mass transfer directly with GEMMA would provide a detailed understanding of performance, doing so would be computationally expensive as it requires solving the relevant mass transfer calculations in each cell in the computational domain. The present work builds on previous findings [11,12] and presents a modelling framework to evaluate the global mass transfer performance in complex multiphase systems. The mass transfer modelling framework relies on input from GEMMA to evaluate the hydrodynamic parameters that influence mass transfer; successively, a surrogate reduced-order model of the system is created based on the hydrodynamic information obtained from the CFD model.…”

Section: Introductionmentioning

confidence: 87%

“…The GEMMA approach makes it possible to obtain key information on the hydrodynamic behaviour of complex multiscale multiphase flows that are of interest to the nuclear industry, as demonstrated in [11] for the case of intensified liquid-liquid extraction in ACCs and in [12] for pulsed sieve-plate extraction columns (PSECs). This section describes a methodology to predict the global mass transfer rates in these flows based on the hydrodynamic information provided by a detailed CFD model based on the GEMMA approach.…”

Section: Mass Transfer Modelling Approachmentioning

confidence: 99%

“…Furthermore, it has been demonstrated that the GEMMA approach can accurately represent the complex multiphase hydrodynamics encountered in liquid-liquid extraction devices [11,12]. Liquid-liquid extraction is when a solute is transferred between two immiscible fluids, typically a polar aqueous phase and a non-polar organic phase, with separation occurring based on relative solubility or chemical reaction at the interface.…”

Section: Introductionmentioning

confidence: 99%

“…However, these were done with models unable to distinguish between the flow regimes. Instead, results in [11,12] demonstrated how an approach such as GEMMA can make available the key hydrodynamic parameters needed to characterise mass transfer in these applications. Although implementing mass transfer directly with GEMMA would provide a detailed understanding of performance, doing so would be computationally expensive as it requires solving the relevant mass transfer calculations in each cell in the computational domain.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Predicting Mass Transfer in Liquid–Liquid Extraction Columns

et al. 2022

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In this work, the GEneralised Multifluid Modelling Approach (GEMMA) is applied to the simulation of liquid–liquid extraction in a Rotating Disc Column (RDC) and a Pulsed Sieve-plate Extraction Column (PSEC). A mass transfer modelling methodology is developed, in which the multiphase flows, droplet size distribution and dispersed phase holdup predicted with computational fluid dynamics are coupled to mass transfer correlations to predict the overall mass transfer. The numerical results for the stage-averaged dispersed phase holdup, Sauter mean droplet diameter and axial solute concentration in the RDC and PSEC agree with experimental observations. The proposed modelling method provides an accurate predictive tool for complex multiphase flows, such as those observed in intensified liquid–liquid extraction, and provides an alternative approach to column design using empirical correlations or pilot plant study.

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Development of a procedure for defining the operation window of annular centrifugal contactors

Hamamah,

Grützner

2024

AIChE Journal

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Although annular centrifugal contactors (ACCs) have been widely applied, their complex operation and its dependence on operational variables are still not fully quantified. That hinders their acceptance and precludes revealing their potential. Intuitive techniques to informedly operate ACCs while maximizing their gain are thus demanded. This work introduces a procedure to define the operation window of an extraction task on ACCs, using CINC V 02 variant, that demonstrates the feasible ranges of the operational variables and the maximum possible throughput. The overlapping impacts of the variables are also visualized, thus understood and, to enhance practicality, the procedure is converted into user‐interface software. The concept is intended to adapt to any task on ACCs and it is based on merging a hydraulic part focusing on the rotor and a statistical one modeling the annulus mass transfer. Additional insights on ACC's hydraulics and mass transfer dynamics are presented, including the time needed to establish the steady state.

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Hydrodynamics of annular centrifugal contactors: A CFD analysis using a novel multiphase flow modelling approach

Cited by 12 publications

References 32 publications

Computational modelling of the separation of molten polymer blends by a centrifugal technique

Computational modelling of the separation of molten polymer blends by a centrifugal technique

Predicting Mass Transfer in Liquid–Liquid Extraction Columns

Development of a procedure for defining the operation window of annular centrifugal contactors

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