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 Q27: Surface Tension Effects: Interfacial Phenomena II
12:50 PM–3:26 PM,
Tuesday, November 20, 2018
Georgia World Congress Center Room: B315
Chair: Douglas Bohl, Clarkson University
Abstract ID: BAPS.2018.DFD.Q27.12
Abstract: Q27.00012 : Controlling Flow Patterns inside a Sessile Droplet using External Volatile Liquid*
3:13 PM–3:26 PM
Hyung Jin Sung
Controlling flow patterns inside droplets has been the subject of many studies because it can be applied to mixing sample, uniform coating and particle separation. Usually, in droplet-based microfluidics, to control internal flows, an external energy is needed, e.g. acoustic, electric, and magnetic fields. Here, we show that when volatile liquid is placed next to the water droplet, vapor-driven solutal Marangoni effects are induced, which can create vortices inside a sessile droplet and mix samples without any active control device. Furthermore, we present that the total number of vortices (M) can be determined by the number of volatile components (N), i.e. M = 2N. The flow patterns are measured using particle image velocimetry. In this talk, physical arguments to support our experimental observations will be discussed.
*This work was supported by the Young Researchers Program (NRF-2018R1C1B6004190) of the National Research Foundation of Korea and BK21 Plus Program. We also thank Acousto-microfluidics Research Center for Next-Generation Healthcare (G04180026) for the financial support to attend the APS DFD 2018 conference.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.Q27.12
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