期刊
CHEMICAL ENGINEERING SCIENCE
卷 130, 期 -, 页码 183-196出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2015.03.004
关键词
Dripping regime; Jetting regime; Core shell droplets; Flow focusing; Solvent encapsulation; Glass capillary microfluidics
资金
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/J020184/1]
- FP7 Marie Curie iComFluid project Grant [312261]
- EPSRC [EP/J020184/1, EP/J020184/2, EP/H029923/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J020184/2, EP/H029923/1, EP/J020184/1] Funding Source: researchfish
A three-phase ax symmetric numerical model based on Volume of Fluid-Continuum Surface Force (VOE-CSF) model was developed to perform parametric analysis of compound droplet production in three-phase glass capillary devices that combine co-flow and countercurrent flow focusing. The model predicted successfully generation of core shell and multi cored double emulsion droplets in dripping and jetting (narrowing and widening) regime and was used to investigate the effects of phase flow rates, fluid properties, and geometry on the size, morphology, and production rate of droplets. As the outer fluid flow rate increased, the size of compound droplets was reduced until a dripping-to-jetting transition occurred. By increasing the middle fluid flow rate, the size of compound droplets increased, which led to a widening jetting regime. The jetting was supressed by increasing the orifice size in the collection capillary or increasing the interfacial tension at the outer interface up to 0.06 N/m. The experimental and simulation results can be used to encapsulate CO2 solvents within gas permeable microcapsules. (C) 2015 The Authors. Published by Elsevier Ltd.
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