Dynamics.pdf (3.28 MB)
Download file

Dynamics of double emulsion break-up in three phase glass capillary microfluidic devices

Download (3.28 MB)
journal contribution
posted on 24.03.2015, 10:04 by Seyed Ali Nabavi, Sai Gu, Goran VladisavljevicGoran Vladisavljevic, Ekanem Ekanem
Pinch-off of a compound jet in 3D glass capillary microfluidic device, which combines co-flowing and countercurrent flow focusing geometries, was investigated using an incompressible three-phase axisymmetric Volume of Fluid-Continuum Surface Force (VOF-CSF) numerical model. The model showed good agreement with the experimental drop generation and was capable of predicting formation of core/shell droplets in dripping, narrowing jetting and widening jetting regimes. In dripping and widening jetting regimes, the presence of a vortex flow around the upstream end of the necking thread facilitates the jet break-up. No vortex flow was observed in narrowing jetting regime and pinch-off occurred due to higher velocity at the downstream end of the coaxial thread compared to that at the upstream end. In all regimes, the inner jet ruptured before the outer jet, preventing a leakage of the inner drop into the outer fluid. The necking region moves at the maximum speed in the narrowing jetting regime, due to the highest level of shear at the outer surface of the thread. However, in widening jetting regime, the neck travels the longest distance downstream before it breaks.

Funding

This work was supported by the Engineering and Physical Sciences Research Council (EPSRC)[grant number P/J020184/1]; and FP7 Marie Curie [grant number 312261].

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Journal of Colloid and Interface Science

Citation

NABAVI, A. ... et al., 2015. Dynamics of double emulsion break-up in three phase glass capillary microfluidic devices. Journal of Colloid and Interface Science, 450, pp. 279-287

Publisher

Elsevier (© the authors)

Version

NA (Not Applicable or Unknown)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Publication date

2015

Notes

This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at : http://creativecommons.org/licenses/by/4.0/

ISSN

1095-7103

Language

en