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Updated: Jun 26, 2026

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
08:41

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Published on: September 7, 2018

Electrorheological fluid dynamics.

Jianwei Zhang1, Xiuqing Gong, Chun Liu

  • 1Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Physical Review Letters
|December 31, 2008
PubMed
Summary
This summary is machine-generated.

We developed a new model for electrorheological (ER) fluid hydrodynamics. Our findings show that specific electrode configurations can prevent shear thinning and maintain the ER effect, crucial for ER fluid applications.

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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
08:41

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Published on: September 7, 2018

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
10:03

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids

Published on: September 30, 2014

Area of Science:

  • Fluid dynamics
  • Rheology
  • Electrorheology

Background:

  • Electrorheological (ER) fluids exhibit changes in viscosity under an electric field.
  • Understanding ER fluid hydrodynamics is key to their application in dampers and actuators.
  • Existing models may not fully capture the complex behavior of ER fluids under shear and electric fields.

Purpose of the Study:

  • To derive a two-phase continuum formulation for ER fluid hydrodynamics using the Onsager principle.
  • To investigate the influence of electric field configuration on ER fluid behavior, specifically shear thinning.
  • To identify electrode configurations that maintain the electrorheological effect.

Main Methods:

  • Application of the Onsager principle to derive a two-phase continuum model.
  • Theoretical formulation of ER fluid hydrodynamics.
  • Comparison of theoretical predictions with experimental data.

Main Results:

  • The derived theoretical model shows excellent agreement with experimental observations.
  • The conventional electrode configuration (electric field perpendicular to shear) can induce shear thinning and loss of the ER effect at high shear rates.
  • An interdigitated, alternating electrodes configuration effectively eliminates the shear-thinning effect.

Conclusions:

  • The Onsager principle provides a robust framework for modeling ER fluid hydrodynamics.
  • Electrode configuration is a critical factor in controlling ER fluid performance.
  • Interdigitated electrode designs offer a promising approach to overcome shear-thinning limitations in ER fluids.