Issue 19, 2010

Predictive model for the size of bubbles and droplets created in microfluidic T-junctions

Abstract

We present a closed-form expression that allows the reader to predict the size of bubbles and droplets created in T-junctions without fitting. Despite the wide use of microfluidic devices to create bubbles and droplets, a physically sound expression for the size of bubbles and droplets, key in many applications, did not yet exist. The theoretical foundation of our expression comprises three main ingredients: continuity, geometrics and recently gained understanding of the mechanism which leads to pinch-off. Our simple theoretical model explains why the size of bubbles and droplets strongly depends on the shape of a T-junction, and teaches how the shape can be tuned to obtain the desired size. We successfully validated our model experimentally by analyzing the formation of gas bubbles, as well as liquid droplets, in T-junctions with a wide variety of shapes under conditions typical to multiphase microfluidics.

Graphical abstract: Predictive model for the size of bubbles and droplets created in microfluidic T-junctions

Article information

Article type
Paper
Submitted
08 Feb 2010
Accepted
16 Jun 2010
First published
09 Jul 2010

Lab Chip, 2010,10, 2513-2518

Predictive model for the size of bubbles and droplets created in microfluidic T-junctions

V. van Steijn, C. R. Kleijn and M. T. Kreutzer, Lab Chip, 2010, 10, 2513 DOI: 10.1039/C002625E

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