Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session F07: Microscale Flows: Drops
8:00 AM–10:10 AM,
Monday, November 19, 2018
Georgia World Congress Center Room: B212
Chair: Ian Jacobi, Technion, Israel Institute of Technology
Abstract ID: BAPS.2018.DFD.F07.8
Abstract: F07.00008 : Pushing the boundaries of microfluidics; an experimental study on high-speed droplet formation in confined microchannels using air as the continuous phase*
9:31 AM–9:44 AM
Julian D. Arroyo
Dac Duc Ho
Carlos H Hidrovo
Microfluidic systems for generation of liquid emulsions provide versatile tools for many applications in natural sciences. Droplet formation in these systems are performed in confined microchannels and as a result of the flow of two immiscible liquids (e.g. water in oil). Here we characterize droplet generation in an alternative format where continuous oil phase is replaced by gas in the microchannel. Droplet breakup is experimentally studied in a flow-focusing type channel in which a middle aqueous phase is pinched off by a high-speed air flow. The microchannels are fabricated in PDMS and feature a non-planar architecture enabling the liquid to be fully surrounded by the air flow. We investigate the Dripping and Jetting regimes for this system and identify the effect of geometry as well as flow conditions. We report droplet generation in the order of 10 kHz with diameters of 50µm and 150µm in the Dripping regime while for the Jetting regime we obtain droplets of 10µm 50µm at frequencies higher than 100 kHz which is an order of magnitude higher than the state-of-the-art for oil-based systems. The outcomes of this work are useful in many areas, namely pharmaceutical industries where uniform droplets can be generated purely in air.
*We appreciate funding from NSF (Award #1522841).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.F07.8
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