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 D28: Flow Instability: General
2:30 PM–4:40 PM,
Sunday, November 18, 2018
Georgia World Congress Center Room: B316
Chair: Bruno Welfert, Arizona State University
Abstract ID: BAPS.2018.DFD.D28.4
Abstract: D28.00004 : Electrohydrodynamic instability between a newtonian and a non-newtonian fluid in a microchannel*
3:09 PM–3:22 PM
Seymen İlke Kaykanat
Seymen İlke Kaykanat
Abdullah Kerem Uğuz
When two immiscible liquids flow in a microchannel, the challenge is to generate droplets. Applying an electric field is an effective method which enables to generate droplets. The focus of this study is the linear stability analysis between a Newtonian and a non-Newtonian fluid in a microchannel in the presence of an electric field. The effects of the dimensionless groups, the electric number, the ratio of the fluid to electric time scales, the Reynolds number, the ratios of the physical properties and the direction of the electric field are analyzed. The maximum growth rates versus the power-law index and the neutral stability curves, i.e. the plot of the power-law indexes versus the critical dimensionless wavenumbers are examined for different thickness ratios which change the effect of the power-law index on the stability. Moreover, the practical ways to destabilize the stable system are investigated, i.e. the electric number related to the applied voltage, the thickness ratio related to the flow rate ratio and the viscosity ratio. The electric number versus the critical dimensionless wavenumbers are plotted to observe the effect of the length of the electrode on the critical electric number.
*The financial support for this work was provided by TÜBİTAK Project 116M374.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D28.4
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