Mass transfer and internal circulation in forming drops

Burkhart, L.E.; Weathers, P.W.; Sharer, P. C.

doi:10.1002/aic.690220620

Cited by 22 publications

(6 citation statements)

References 15 publications

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“…Droplet-based microfluidics has been demonstrated to be a potential instrument for the processes such as drug development, chemical engineering, and biotechnology − due to its superior mass transfer performance and mixing efficiency. − These advantages are mainly governed by two elements: interfacial area and internal circulation flow. The internal circulation flow induced by shear stress can intensify chaotic advection to enhance mass transfer and mixing efficiency, , thus playing a significant role in the performance of reactions in droplets. It is necessary to understand the circulating flow inside the droplet to make the most of these advantages.…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation of Internal Flow and Mixing within Droplets in a T-Junction Microchannel

Yao

et al. 2021

Ind. Eng. Chem. Res.

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This work performed a three-dimensional numerical investigation on the effect of the viscosity ratio on the circulation topology and mixing inside droplets in a T-junction microchannel using the volume-of-fluid method. The results suggest that the recirculation zone shrinks at both ends of the droplet with increasing viscosity ratios, whereas it expands in the droplet’s main body. A modified non-dimensional circulation time was defined by considering the local circulation, which can better capture the influence of the viscosity ratio on the mixing intensity. The results show that the mixing intensity decreases with higher viscosity ratios, especially at the front end of the droplet. The mixing inside the droplets is limited mainly due to the isolation of the symmetrical recirculation vortices. Accordingly, an improvement to the T-junction was proposed to break the balance of the flow symmetry at the droplet formation stage, thus significantly enhancing the mixing intensity.

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Section: Introductionmentioning

confidence: 99%

CFD Simulation of Internal Flow and Mixing within Droplets in a T-Junction Microchannel

Yao

et al. 2021

Ind. Eng. Chem. Res.

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“…(2) For a reaction which is of n-th order with respect to B and m-th order with respect to A, when the reaction rate is small, the expression for the extent of extraction is the same as in case (1). However, in case (2) as the reaction rate increases, the extent of extraction again becomes proportional to the square root of drop formation time, rather than to the first power of tf.…”

Section: Resultsmentioning

confidence: 95%

Extraction kinetics of copper with benzoylacetone during drop formation.

Inoue

Okubo

Nakashio

1979

J. Chem. Eng. Japan

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The extraction rate of copper with benzoylacetone was studied by a single-drop method, as basic research on extraction kinetics of metals by chelating agents. Specifically, a study of the extraction rate during drop formation was carried out. A theoretical analysis of extraction kinetics accompanied by chemical reaction in the continuous phase was carried out for an (w, «)-th order reaction. The relationships between the extent of extraction during drop formation and drop formation time, concentrations of reactants in both phases and the reaction rate constant were clarified. The experimental results were correlated theoretically. The good correspondence obtained indicates that the theoretical analysis described in this paper is useful for determination of kinetic mechanismsfor the extraction of metals by chelating agents.

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“…However, the flow patterns inside a rising, falling, or static drop in a quiescent second liquid or into air was studied macroscopically by, e.g., (Horton et al 1965;Hetsroni et al 1970;Liu and Zheng 2006;Spells 1952;Hudson 2010). The emphasis of these works was mostly on understanding of the effect of the droplet's internal circulation on mass transfer rates (Burkhart et al 1976;Johnson and Hamielec 1960;Timgren et al 2008;Dore et al 2012;Alves et al 2005). A number of publications deal with the internal flow pattern of liquid slugs (i.e., droplets moving along channels in contact with the channel wall) and liquid segments between neighboring slugs.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous visualization of the flow inside and around droplets generated in microchannels

Duxenneuner

Fischer

Windhab

et al. 2013

Microfluid Nanofluid

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This paper reports the visualization of droplet formation in co-flowing microfluidic devices using foodgrade aqueous biopolymer-surfactant solutions as the dispersed droplet phase and sunflower oil as the continuous phase. Microparticle image velocimetry and streak imaging techniques are utilized to simultaneously recover the velocity profiles both within and around the dispersed phase during droplet formation and detachment. Different breakup mechanisms are found for Newtonian-Newtonian and non-Newtonian-Newtonian model water-in-oil emulsions, emphasizing the influence of process and material parameters such as the flow rates of both phases, interfacial tension, and the elastic properties of the non-Newtonian droplet phase on the droplet formation detachment dynamics.

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Mass transfer and internal circulation in forming drops

Cited by 22 publications

References 15 publications

CFD Simulation of Internal Flow and Mixing within Droplets in a T-Junction Microchannel

CFD Simulation of Internal Flow and Mixing within Droplets in a T-Junction Microchannel

Extraction kinetics of copper with benzoylacetone during drop formation.

Simultaneous visualization of the flow inside and around droplets generated in microchannels

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