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 KP1: Poster Session (3:20-4:05pm)
3:20 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: Level 1, Exhibit Hall B2 by the GFM videos
Abstract ID: BAPS.2018.DFD.KP1.92
Abstract: KP1.00092 : Electrokinetic instability in co-flowing fluids with matched conductivities*
Presenter:
Le Song
(Clemson University, Hefei University of Technology)
Authors:
Le Song
(Clemson University, Hefei University of Technology)
Purva Jagdale
(Clemson University)
Liandong Yu
(Hefei University of Technology)
Xiangchun Xuan
(Clemson University)
Electrokinetic fluid flows with conductivity gradients have been reported to generate instability waves if the applied electric field reaches a threshold value. We demonstrate in this work that such electrokinetic instabilities can also be formed at the interface of ferrofluid and buffer solutions with matched electric conductivities. We develop a two-dimensional numerical model to potentially explain this phenomenon. It is found that the permittivity difference between the two fluids is not the primary cause of the observed electrokinetic instability. We therefore propose to use the diffusion-induced conductivity gradients that are formed at the ferrofluid/buffer interface because of the mismatched diffusivities of ferrofluid nanoparticles and buffer ions. However, due to the limitation of a two-dimensional model, our predicted threshold electric fields are much smaller than the experimental values.
*NSF CBET-1704379
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.KP1.92
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