Simultaneous visualization of the flow inside and around droplets generated in microchannels
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Date
2014-04
Publication Type
Journal Article
ETH Bibliography
yes
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Abstract
This paper reports the visualization of droplet formation in co-flowing microfluidic devices using food-grade aqueous biopolymer–surfactant solutions as the dispersed droplet phase and sunflower oil as the continuous phase. Microparticle image velocimetry and streak imaging techniques are utilized to simultaneously recover the velocity profiles both within and around the dispersed phase during droplet formation and detachment. Different breakup mechanisms are found for Newtonian–Newtonian and non-Newtonian–Newtonian model water-in-oil emulsions, emphasizing the influence of process and material parameters such as the flow rates of both phases, interfacial tension, and the elastic properties of the non-Newtonian droplet phase on the droplet formation detachment dynamics.
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published
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Journal / series
Volume
16 (4)
Pages / Article No.
743 - 755
Publisher
Springer
Event
Edition / version
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Software
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Date collected
Date created
Subject
Microparticle image velocimetry; Co-flow geometry; Droplet generation; Viscoelasticity; Fluid elasticity; Internal flow
Organisational unit
08821 - Fischer, Peter (Tit.-Prof.)
03345 - Windhab, Erich Josef (emeritus) / Windhab, Erich Josef (emeritus)
Notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.