Advanced Emulsions: Enabling Advanced Emulsion with Microchannel Architecture

Silva, Laura; Tonkovich, Anna Lee; Lochhead, Robert Y.; Qiu, Dongming; Pagnatto, Krissy; Neagle, Paul; Perry, Steve F.; Lerou, Jan

doi:10.1021/bk-2007-0961.ch004

Cited by 2 publications

(1 citation statement)

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“…Emulsions are multiphase fluid systems with one of the immiscible liquids dispersed in the form of droplets in the continuous phase liquid. The characteristics of emulsion products, such as droplet size distribution and stability, depend on both product formulation and the processing method (Silva et al 2005). Emulsions produced in the conventional processes-such as in the batch process using blenders-are usually poly-disperse, unstable, and energyintensive (Friberg and Larsson 1997).…”

Section: Introductionmentioning

confidence: 99%

Micro-droplet formation in non-Newtonian fluid in a microchannel

Qiu¹,

Silva²,

Tonkovich³

et al. 2009

Microfluid Nanofluid

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Micro-droplet formation from an aperture with a diameter of micrometers is numerically investigated under the cross-flow conditions of an experimental microchannel emulsification process. The process involves dispersing an oil phase into continuous phase fluid through a microchannel wall made of apertured substrate. Crossflow in the microchannel is of non-Newtonian nature, which is included in the simulations. Micro-droplets of diameter 0.76-30 lm are obtained from the simulations for the apertures of diameter 0.1-10.0 lm. The simulation results show that rheology of the bulk liquid flow greatly affects the formation and size of droplets and that dispersed micro-droplets are formed by two different breakup mechanisms: in dripping regime and in jetting regime characterized by capillary number Ca. Relations between droplet size, aperture opening size, interfacial tension, bulk flow rheology, and disperse phase flow rate are discussed based on the simulation and the experimental results. Data and models from literature on membrane emulsification and T-junction droplet formation processes are discussed and compared with the present results. Detailed force balance models are discussed. Scaling factor for predicting droplet size is suggested.

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Section: Introductionmentioning

confidence: 99%