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 M07: Microscale Flows: Emulsions
8:00 AM–9:57 AM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B212
Chair: Myeongsub Kim, Florida Atlantic University
Abstract ID: BAPS.2018.DFD.M07.2
Abstract: M07.00002 : Flow of a highly-concentrated emulsion through a narrow constriction
8:13 AM–8:26 AM
Presenter:
Alexander Zinchenko
(Univ of Colorado - Boulder)
Authors:
Alexander Zinchenko
(Univ of Colorado - Boulder)
Robert Davis
(Univ of Colorado - Boulder)
Multipole-accelerated boundary-integral algorithm is developed to study creeping flow of an emulsion of many (N>100) deformable 3D drops with high volume fraction (80-90%) though a microchannel with tight constriction. The simulation setup is designed to resemble the experiments [1]; the channel depth and throat width are comparable to the drop non-deformed size and are an order of magnitude smaller than the entrance width, so that the emulsion flow away from the throat is rearranged into a single file motion in the constriction. Periodic inlet/outlet boundaries with prescribed pressure drop are used to formulate boundary-integral equations based on the 1-periodic Green function. Multipole acceleration tools [2] allow for necessary ultra-high resolution on the drop surfaces and channel walls to study the statistics of drop rearrangement/breakup at the constriction, critical breakup conditions and the dependence of flow rate on the capillary number and channel geometry.
[1] L. Rosenfeld et. al. Break-up of droplets in a concentrated emulsion flowing through a narrow constriction. Soft Matter, 2014, 10, 421-430.
[2] A.Z. Zinchenko & R.H. Davis. Emulsion flow through a packed bed with multiple drop breakup. J. Fluid Mech., 2013, 725, 611-663.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M07.2
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