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Updated: Jun 14, 2026

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

Extensional instability in electro-osmotic microflows of polymer solutions.

R M Bryce¹, M R Freeman

¹Department of Physics, University of Alberta, Edmonton, Canada. rbryce@phys.ualberta.ca

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

|April 7, 2010

Summary

Electro-osmotic pumping in microfluidics can induce instabilities in polymer solutions due to polymer stretching. These flow disturbances, observed even at low concentrations, suggest potential for enhanced mixing in complex fluid systems.

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Area of Science:

Fluid dynamics
Polymer physics
Microfluidics

Background:

Microfluidic fluid transport is typically laminar due to low Reynolds numbers.
Suspended polymers introduce elasticity, enabling instabilities with sufficient stretching.
High molecular weight polymers are key to observing these phenomena.

Purpose of the Study:

To investigate the excitation of extensional instabilities in dilute polymer solutions using electro-osmotic pumping.
To determine the influence of polymer concentration on flow fluctuations.
To understand the implications for modeling complex fluid flows in microfluidic systems.

Main Methods:

Utilizing standard electro-osmotic pumping to achieve necessary flow velocities.
Employing dilute solutions of high molecular weight polymers.
Measuring flow fluctuations and their dependence on polymer concentration.

Main Results:

Electro-osmotic flow velocities are sufficient to excite extensional instabilities in dilute polymer solutions.
Flow fluctuations show a concentration dependence that plateaus at a specific threshold.
This plateau occurs below the overlap concentration, indicating molecular crowding effects.

Conclusions:

Electro-osmotic flows of complex fluids deviate from steady-state behavior.
These instabilities offer potential for enhanced mixing in microfluidic applications.
Accurate modeling of complex liquids like biopolymer suspensions requires consideration of these dynamic effects.