Kalli, M;
Angeli, P;
(2022)
Effect of surfactants on drop formation flow patterns in a flow-focusing microchannel.
Chemical Engineering Science
, 253
, Article 117517. 10.1016/j.ces.2022.117517.
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Abstract
The formation of droplets in an immiscible liquid in the presence of different surfactants was studied experimentally using a flow-focusing microchannel. A low viscosity silicone oil (4.6 mPa s) was used as the continuous phase and a mixture of 48% w/w water and 52% w/w glycerol was the dispersed phase. A cationic (CMCDTAB = 20 mM), an anionic (CMCSDS = 11 mM), and a non-ionic (CMCTX100 = 3.5 mM) surfactant were added in the aqueous phase, at several concentrations. Five patterns of drop formation were identified, namely squeezing, dripping, jetting, threading and tip streaming/jetting, whose boundaries were affected by the surfactant type and concentration. Using dynamic interfacial tension values, it was possible to plot a universal flow pattern map with the capillary numbers of the two phases as coordinates, where the transition boundaries between the dripping and the jetting patterns collapsed for all fluid systems considered, including the solutions with and without surfactants.
| Type: | Article |
|---|---|
| Title: | Effect of surfactants on drop formation flow patterns in a flow-focusing microchannel |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.ces.2022.117517 |
| Publisher version: | https://doi.org/10.1016/j.ces.2022.117517 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Drop formation pattern maps, Flow pattern transitions, Surfactants, Dynamic interfacial tension, Capillary number, Flow-focusing microchannel |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10148662 |
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