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Electrohydrodynamics of a compound drop.
Ali Behjatian1, Asghar Esmaeeli
1Department of Mechanical Engineering & Energy Processes, Southern Illinois University, Carbondale, Illinois 62901, USA.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 16, 2013
Summary
The behavior of compound drops in electric fields was analytically studied. Four flow patterns and deformation modes were identified, determined by electric stresses and fluid properties, enabling prediction of dynamic responses.
Area of Science:
- Fluid dynamics
- Electrokinetics
- Rheology
Background:
- Understanding compound drop behavior in electric fields is crucial for microfluidic applications.
- Previous studies often simplified drop structures or electric field conditions.
Purpose of the Study:
- To analytically investigate the electrohydrodynamics of compound drops in uniform electric fields.
- To identify and map possible flow patterns and deformation modes.
- To predict the dynamic responses of inner and outer drops.
Main Methods:
- Analytical solution of electrohydrodynamic equations for leaky-dielectric fluids.
- Analysis of electric and flow fields under small electric field strength and fluid inertia.
- Construction of circulation and deformation maps.
Main Results:
- Identified four distinct flow patterns based on flow direction and vortex configurations.
- Determined four deformation modes governed by electric and hydrodynamic stresses.
- Characterized transitions between flow and deformation patterns using fluid properties.
Conclusions:
- Electric shear stresses and fluid properties dictate compound drop flow patterns and deformation.
- The study provides a framework for predicting compound drop behavior in electric fields.
- Developed maps offer insights into dynamic responses and transitions for various fluid systems.
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