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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Published on: September 7, 2018

Microfluidic chaotic stirrer utilizing induced-charge electro-osmosis.

Hui Zhao¹, Haim H Bau

¹Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|August 7, 2007

Summary

Induced electro-osmosis, a method for pumping fluids in microfluidic devices, can also achieve stirring and chaotic advection. This study demonstrates its effectiveness in microfluidic systems for enhanced mixing.

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Area of Science:

Microfluidics
Fluid Dynamics
Electrokinetics

Background:

Induced electro-osmosis is increasingly used for fluid pumping in microfluidic devices.
Potential for induced electro-osmosis in microfluidic stirring and chaotic advection remains underexplored.

Purpose of the Study:

To investigate the application of induced electro-osmosis for stirring and chaotic advection in microfluidic systems.
To theoretically analyze an idealized stirrer design and numerically simulate a realistic microfluidic device.

Main Methods:

Theoretical analysis of an idealized concentric annulus stirrer with an array of electrodes.
Analytical solution for flow patterns induced by a spatially varying potential distribution.
Numerical simulations of a practical microfluidic stirrer design.

Main Results:

The idealized stirrer generates quadruple electro-osmotic flow around an inner cylinder.
Alternating potential distributions induce chaotic advection in the microfluidic cavity.
Numerical simulations confirm the feasibility of inducing chaotic advection in a realistic design.

Conclusions:

Induced electro-osmosis is a viable method for achieving stirring and chaotic advection in microfluidics.
The study provides theoretical and numerical evidence for designing effective microfluidic stirrers using this technique.