Experiments and fully transient coupled CFD-PBM 3D flow simulations of disperse liquid-liquid flow in a baffled stirred tank

Rave, Kevin; Hermes, Mario; Wirz, Dominic; Hundshagen, Markus; Friebel, Anne; Harbou, Erik von; Bart, Hans‐Jörg; Skoda, Romuald

doi:10.1016/j.ces.2022.117518

Cited by 15 publications

(10 citation statements)

References 65 publications

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“…According to the previous works, the areas where turbulence energy rapidly dissipates overlapped with those where the breakage of dispersed phase droplets occurs. 21,48,60 The above analysis suggested that inside Kenics static mixer, the breakage of the dispersed-phase droplet almost took place around the mixing element wall. It was also found that the higher fluid velocity led to a higher turbulence dissipation rate.…”

Section: Effect Of Fluid Velocity On Hydrodynamic and Interphase Mass...mentioning

confidence: 89%

Three-Dimensional Model on Liquid–Liquid Mass Transfer of the Kenics Static Mixer: Considering Dynamic Droplet Size Distribution

Cao

Zhou

Qian

et al. 2023

Ind. Eng. Chem. Res.

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The Kenics static mixer is anticipated to replace conventional extraction apparatuses because of its outstanding mass transfer performances and economy. The lack of a practicable mass transfer model limits its wide application. In this study, a three-dimensional liquid−liquid mass transfer model was developed for the Kenics static mixer while considering the dynamic droplet size distribution due to both interphase mass transfer and droplet breakage and coalescence. It has been proven to have good accuracy because of the mean relative errors between simulated and experimental results within 7%. Different hydrodynamic and mass transfer behaviors were found at different fluid velocities. The patterns thus presented were supported by other publications as an additional proof of the constructed model's accuracy. It was also found from the effect analysis on fluid velocity that the static mixer, even with few mixing elements (5) and at a low total inlet fluid velocity (0.7 m/s), can achieve excellent mass transfer performance.

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Section: Effect Of Fluid Velocity On Hydrodynamic and Interphase Mass...mentioning

confidence: 89%

Three-Dimensional Model on Liquid–Liquid Mass Transfer of the Kenics Static Mixer: Considering Dynamic Droplet Size Distribution

Cao

Zhou

Qian

et al. 2023

Ind. Eng. Chem. Res.

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“…An extensive database was established to describe the mutual influences of the process conditions such as impeller speed, feed phase fraction, and flow rate on the DSD, Sauter mean diameter, and the local holdup. As in our previous work [22,28,29], the image-based probe can reliably measure the DSD with a high statistical significance, even under difficult conditions at a high disperse phase fraction. Together with the CFD, detailed information about the flow patterns and the DSD could be evaluated.…”

Section: Introductionmentioning

confidence: 55%

“…Three Optical Multimode Online Probes (OMOP) [30] were used to investigate the droplet size distribution (𝑀𝑃 1−3 ) at different positions and the local holdup was measured in the upper half of the vessel (𝑀𝑃 𝐻 ) as depicted in Figure 3. An endoscopic optical probe is inserted from outside at 𝑀𝑃 1 and was also used in previous works [22,29,31,32] and is described elsewhere [33]. The positions 𝑀𝑃 2 and 𝑀𝑃 3 are based on a two-sided design by Mickler and Bart [30] needing a measurement flange.…”

Section: Pump-mixer Geometrymentioning

confidence: 99%

Fluid Dynamics in a Continuous Pump-Mixer

et al. 2022

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The fluid dynamic (flow rates) and hydrodynamic behavior (local droplet size distributions and local holdup) of a continuous DN300 pump-mixer were investigated using water as the continuous phase and paraffin oil as the dispersed phase. The influence of the impeller speed (N = 375 to 425 rpm), the feed phase ratio (φF = 10 to 30 vol.-%), and the flow rate (V˙tot ≈ 0.5 to 2.3 L/min) were investigated by measuring the pumping height, local holdup of the disperse phase, and the droplet size distribution (DSD). The latter one was measured at three different vessel positions using an image-based telecentric shadowgraphic technique. The droplet diameters were extracted from the acquired images using a neural network. The Sauter mean diameters were calculated from the DSD and correlated with an extended model based on Doulah (1975), considering the impeller speed, the feed phase ratio, and additionally the flow rate. The new correlation can describe an extensive database containing 155 experiments of the fluid and hydrodynamic within a 15% error range.

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“…42 In addition, the effect of mixing on coalescence and breakage of droplets in the mixer were also investigated numerically and experimentally. 43,44 Although CFD-PBE simulation was used to predict the spatial and temporal distribution of droplets in single-stage extractors, the effect of volume fraction and DSD on mass transfer parameter, namely volumetric mass transfer coefficient (k L α) has not been clearly identified. Moreover, there is limited research on the hydrodynamic behavior and mass transfer characteristic of the multistage mixer-settler where the mass transfer rate of each stage is not identical, resulting in different stage efficiencies.…”

Section: Introductionmentioning

confidence: 99%

“…The binary coalescent interface in the settler was applied to CFD-PBE simulations to predict the time evolution of the settling interface, volume fraction, and DSD of the dispersed phase. − Meanwhile, coalescence and breakage models of droplets were employed to describe the variation of DSD and extraction behavior in a single stage mixer . In addition, the effect of mixing on coalescence and breakage of droplets in the mixer were also investigated numerically and experimentally. , Although CFD-PBE simulation was used to predict the spatial and temporal distribution of droplets in single-stage extractors, the effect of volume fraction and DSD on mass transfer parameter, namely volumetric mass transfer coefficient ( k L α) has not been clearly identified. Moreover, there is limited research on the hydrodynamic behavior and mass transfer characteristic of the multistage mixer-settler where the mass transfer rate of each stage is not identical, resulting in different stage efficiencies.…”

Section: Introductionmentioning

confidence: 99%

CFD-PBE Simulation of Flow Dynamics and Mass Transfer in Two-Stage Countercurrent Mixer-Settler

Zheng

Yang

Xiao

et al. 2023

Ind. Eng. Chem. Res.

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Flow condition and mass transfer behavior of liquid−liquid extraction in a two-stage countercurrent extractor are investigated experimentally and numerically. CFD-PBE simulation is adopted to analyze the impact of operating parameters, including impeller speed, residence time, and organic-aqueous ratio of feed flow on volume fraction and droplet size of dispersed phase and volumetric mass transfer coefficient. Droplet size distribution is calculated by considering breakage and coalescence of dispersed phase. The allocation of dispersed phase between stages is found to be determined by impeller speed. Meanwhile, the allocation of dispersed phase between mixers and settlers is governed by residence time and organic-aqueous ratio of feed flow. Turbulence intensity, volume fraction, and droplet size distribution are revealed to be dominating parameters that affect the spatial nonuniform distribution of volumetric mass transfer coefficient. The mass transfer rate can be improved by increasing impeller speed in two stages. Higher residence time and organic-aqueous ratio of feed flow, however, have opposite effects on mass transfer rate in stage-1 and stage-2.

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Experiments and fully transient coupled CFD-PBM 3D flow simulations of disperse liquid-liquid flow in a baffled stirred tank

Cited by 15 publications

References 65 publications

Three-Dimensional Model on Liquid–Liquid Mass Transfer of the Kenics Static Mixer: Considering Dynamic Droplet Size Distribution

Three-Dimensional Model on Liquid–Liquid Mass Transfer of the Kenics Static Mixer: Considering Dynamic Droplet Size Distribution

Fluid Dynamics in a Continuous Pump-Mixer

CFD-PBE Simulation of Flow Dynamics and Mass Transfer in Two-Stage Countercurrent Mixer-Settler

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