Drop rise velocities and fluid dynamic behavior in standard test systems for liquid/liquid extraction—experimental and numerical investigations

Bäumler, Kathrin; Wegener, M.; Paschedag, Anja R.; Bänsch, Eberhard

doi:10.1016/j.ces.2010.11.009

Cited by 60 publications

(53 citation statements)

References 29 publications

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“…The experimental results show a good agreement with the correlation for viscous spheres with a completely mobile interface by Feng and Michaelides 44. Results reported by Wegener 36, Bäumler et al 50, and Eiswirth et al 51 with the same physical system lead to the conclusion that there were no surface‐stabilizing impurities in the system. This status served as a reference for further investigations under various system conditions.…”

Section: Resultssupporting

confidence: 85%

Systematic Analysis of Single Droplet Coalescence

et al. 2014

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Coalescence behavior in liquid-liquid dispersions is controlled by various parameters. Thus, data from different research groups can differ significantly. Dynamic coalescence processes were analyzed systematically with the EFCE standard test system toluene/water in two different research laboratories. After comparability was proven with standardized batch settling tests and drop rise velocity measurements, the influence of drop size ratio and varying NaCl and NaOH concentrations on coalescence probability was investigated. Since the ions led to a coalescence inhibition, no clear impact of drop size ratio could be observed. The analysis of drop contact showed longer contact times for increasing equivalent drop diameter. This promotes coalescence and corresponds to film drainage model.

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Section: Resultssupporting

confidence: 85%

Systematic Analysis of Single Droplet Coalescence

et al. 2014

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“…in a liquid/liquid extraction system [29], and simulations of liquid/gas phases with mass transfer (evaporation/condensation) [30,31].…”

Section: Naviermentioning

confidence: 99%

Quantitative comparison of Taylor flow simulations based on sharp‐interface and diffuse‐interface models

Aland

Boden

Hahn³

et al. 2013

Numerical Methods in Fluids

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SUMMARYA pressure‐driven flow of elongated bullet‐shaped bubbles in a narrow channel is known as Taylor flow or bubble‐train flow. This process is of relevance in various applications of chemical engineering. In this paper, we describe a typical simplified experimental setting, with surface tension, density and viscosity as prescribed input parameters. We compare a sharp‐interface model based on a moving grid aligned with the bubble boundary (ALE coordinates) and a diffuse‐interface model where the bubble shape is implicitly given by a phase‐field function. Four independent implementations based on the two modeling approaches are introduced and described briefly. Besides the simulation of the bubble shapes, we compare some resulting quantities such as pressure difference and film widths within the implementations and to existing analytical and experimental results. The simulations were conducted in 2D and 3D (rotationally symmetric). Good accordance of the results indicate the applicability and the usability of all approaches. Differences between the models and their implementations are visible but in no contradiction to theoretical results. Copyright © 2013 John Wiley & Sons, Ltd.

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“…A variation of the initial droplet velocity led to the same characteristic velocity. Bäumler et al (2011) presented simulation results of droplets in three liquidliquid systems obtained with a moving mesh method in an axisymmetric setting. The simulated characteristic rise velocities of toluene droplets in water agree very well with the experimental maximum rise velocities of Wegener et al (2010).…”

Section: Introductionmentioning

confidence: 99%