Experimental comparison of measurement techniques for drop size distributions in liquid/liquid dispersions

Maaß, Susanne; Wollny, Stefan; Voigt, Andreas; Kraume, Matthias

doi:10.1007/s00348-010-0918-9

Cited by 129 publications

(108 citation statements)

References 31 publications

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“…Further based on similar measurements reported elsewhere [14] and in the current work, the values they obtained are significantly smaller than would be expected for the liquid phases employed and the very poor mixing conditions of the device at the operating conditions employed as noted previously. The apparent under-prediction of the droplet size in these measurements is consistent with the comparison of Maaß et al [13] in which FBRM was found to give results an order of magnitude smaller than those from direct imaging using an endoscope probe.…”

Section: Centrifugal Contactor Mixing Vane Options 673supporting

confidence: 89%

“…A number of methods for in situ measurement are available including both image processing and laser-based techniques, though it has been shown that large discrepancies can exist between the data measured using the various tools, and direct imaging and image processing is still considered the most reliable. [13] In addition, the use of an intrusive probe is questionable in centrifugal contactors given the limited flow area of the mixing zone. Schuur et al give data obtained from a focused beam reflective measurement (FBRM) probe positioned between housing vanes under the rotor.…”

Section: Centrifugal Contactor Mixing Vane Options 673mentioning

confidence: 99%

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Liquid–Liquid Mixing Studies in Annular Centrifugal Contactors Comparing Stationary Mixing Vane Options

Wardle

2015

Solvent Extraction and Ion Exchange

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Comparative studies of multiphase operation of an annular centrifugal contactor show the impact of housing stationary mixing vane configuration. A number of experimental results for several different mixing vane options are reported for operation of a 12.5 cm engineeringscale contactor unit. Fewer straight vanes give greater mixing-zone hold-up compared to curved vanes. Quantitative comparison of droplet size distribution also showed a significant decrease in mean diameter for four straight vanes versus eight curved vanes. This set of measurements gives a compelling case for careful consideration of mixing vane geometry when evaluating hydraulic operation and extraction process efficiency of annular centrifugal contactors.

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Section: Centrifugal Contactor Mixing Vane Options 673supporting

confidence: 89%

Section: Centrifugal Contactor Mixing Vane Options 673mentioning

confidence: 99%

Liquid–Liquid Mixing Studies in Annular Centrifugal Contactors Comparing Stationary Mixing Vane Options

Wardle

2015

Solvent Extraction and Ion Exchange

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“…To detect the drop size distribution (at T = 293 K) in a baffled stirred tank DN150 (H/D = 1) equipped with a Rushton turbine (d/D = 0.33) an endoscope technique was used. For detailed description of this set-up and measurement technique see Maaß et al (2011) and Ritter and Kraume (2000). Continuous phase was deionised water with added NaOH (Merck 1.09956 p.a.…”

Section: Experimental Investigations In Stirred Tankmentioning

confidence: 99%

Coalescence efficiency model including electrostatic interactions in liquid/liquid dispersions

Kamp¹,

Kraume²

2015

Chemical Engineering Science

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The drop size distribution is an essential process variable in liquid/liquid systems and relevant in many technical applications. It can be described by population balance equations. A coalescence efficiency model was developed to be able to describe the well-known coalescence inhibition due to changing pH value or salt concentration. The model includes the attractive van der Waals and repulsive electrostatic force according to the DLVO theory into the population balance equation framework. This DLVO model can extend existing simulations in a straightforward manner due to a conceptual implementation. Moreover, zeta potential measurements were performed and the model was applied to simulate experiments in a stirred tank. Hence, the drop size distribution could be predicted well with changing pH value. The results are discussed in comparison to simulations with existing models in literature.

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“…For drop size measurements, Maaß et al (2011) compared a focus beam reflectance instrument (FBRM), a twodimensional optical reflectance instrument and a fibre optical focus beam reflectance sensor in a stirred vessel, and illustrated the limitations of the techniques based on the laser back-scatter principle. The FBRM probe has also been implemented during pipe flows (Schümann et al 2016a), but with reported uncertainties of 50%.…”

Section: Introductionmentioning

confidence: 99%

Optical measurements in evolving dispersed pipe flows

Voulgaropoulos

Angeli

2017

Exp Fluids

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Experimental comparison of measurement techniques for drop size distributions in liquid/liquid dispersions

Cited by 129 publications

References 31 publications

Liquid–Liquid Mixing Studies in Annular Centrifugal Contactors Comparing Stationary Mixing Vane Options

Liquid–Liquid Mixing Studies in Annular Centrifugal Contactors Comparing Stationary Mixing Vane Options

Coalescence efficiency model including electrostatic interactions in liquid/liquid dispersions

Optical measurements in evolving dispersed pipe flows

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