Effects of viscosity on drop diameter of W/O emulsion dispersed in a stirred tank.

Ohtake, Takaaki; Hano, Tadashi; Takagi, Kazuyoshi; Nakashio, Fumiyuki

doi:10.1252/jcej.20.443

Cited by 60 publications

(18 citation statements)

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“…As mentioned above, multiple emulsion genesis during catastrophic phase inversion has been investigated by many authors [103][104][105][106][107], and recently Liu et al [85] [108] is based on a previous idea of Ohtake et al [110] and is consistent with the droplet shear deformation theory developed by Taylor [111] (where it is shown that shear droplet deformation increases with droplet diameter and decreases with interfacial tension). It is considered that the surfactant at droplet interface can develop a concave interface, and that these concavities are enhanced by deformation thus permitting the continuous phase to migrate into the internal one.…”

Section: Multiple Emulsions During Phase Inversionmentioning

confidence: 87%

Phase inversion emulsification: Current understanding and applications

Perazzo

Preziosi

Guido

2015

Advances in Colloid and Interface Science

209

121

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Section: Multiple Emulsions During Phase Inversionmentioning

confidence: 87%

Phase inversion emulsification: Current understanding and applications

Perazzo

Preziosi

Guido

2015

Advances in Colloid and Interface Science

209

121

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“…where A is the specific interfacial area which is calculated by the correlation of Ohtake et al for W/O emulsion globule sizes in ELM systems [66]. Comparing Eqs.…”

Section: Extraction Kinetics Of Dy(iii) By the Elm Processmentioning

confidence: 99%

Response Surface Optimization of Dysprosium Extraction Using an Emulsion Liquid Membrane Integrated with Multi‐Walled Carbon Nanotubes

et al. 2018

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A new emulsion liquid membrane was prepared for dysprosium (Dy) extraction from aqueous solution using multi-walled carbon nanotubes (MWCNTs). The influence of MWCNT concentration, carrier and surfactant concentration, stirring speed, feed-phase pH, and internal phase concentration and their interactive effects were studied. A regression model for Dy extraction was developed and the parameters were optimized by response surface methodology. The extent of extraction increases with higher MWCNT concentration up to a certain level. The Dy extraction through the liquid membrane containing MWCNT improves with time. Moreover, the overall mass transfer coefficient was enhanced in the presence of MWCNT due to the formation of a more stable emulsion and liquid membrane.

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“…However, in many practical industrial applications, liquid-liquid dispersions are required to be implemented at turbulent flow conditions. This is the case for massive productions processed at high throughput, such as oil-water emulsion preparation by means of stirring (Ohtake et al 1987), statically mixing (Theron and Le Sauze 2011), and impinging jets (Siddiqui 2014;Tsaoulidis and Angeli 2017). Going back to earlier studies, Kolmogorov and Hinze (Kolmogorov 1949;Hinze 1955) laid foundation by proposing scaling theory of dispersion breaking up into emulsion droplets at turbulent flow conditions, stating that energy cascade inside the flow contributes the most.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on single drop breakage in two-stream impinging microchannels

Bellettre

Montillet

et al. 2021

Exp Fluids

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Experimental study on drop breakage is carried out in the microchannels utilizing head-on impingement configuration by observing single drop breakup process. In this study, the breakage of oil drops with diameter ranging from 30 to 200 μm is investigated in the vicinity of flows impingement region by using high-speed photography at varied flow rate conditions. The most prominent phenomenon of the single drop breakup in the two streams impinging flow field is that the drop tends to break into multiple fragments. The breakage time and the number of daughter drops in the resulting population are statistically analysed and found to be highly dependent on the mother drop size and energy dissipation rate. Two different micro-system geometries, the 600-600 system and the 600-300 system, are compared to evaluate the advantages and disadvantages of swirl flow developed due to the off-axis layout of inlet channels in the 600-300 system. The results show that swirl flow establishes a low pressure area acting as the dead zone, where drop can be trapped and then drastically stretched to breakup. Compared with the 600-600 system, the detrimental effect of swirl flow inside the 600-300 system on increasing the breakage time can be offset by much greater amount of daughter drops generated. In general, the 600-300 system performs more effectively than the 600-600 system because of the less isotropic flow feature. And this superiority is more distinct when energy dissipation rate is higher. Acronyms Ca Capillary number,-DDSD daughter drop size distribution,-Re Reynolds number,-SSI swirl strength index,-We Weber number,-Wet Weber number in turbulent flow,-We* Weber number defined in this study,

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Effects of viscosity on drop diameter of W/O emulsion dispersed in a stirred tank.

Cited by 60 publications

References 1 publication

Phase inversion emulsification: Current understanding and applications

Phase inversion emulsification: Current understanding and applications

Response Surface Optimization of Dysprosium Extraction Using an Emulsion Liquid Membrane Integrated with Multi‐Walled Carbon Nanotubes

Experimental investigation on single drop breakage in two-stream impinging microchannels

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