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Nonuniform Electro-osmotic Flow Drives Fluid-Structure Instability.

Evgeniy Boyko1, Ran Eshel1, Amir D Gat1

  • 1Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.

Physical Review Letters
|February 1, 2020
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Summary
This summary is machine-generated.

Electro-osmotic flow in soft chambers can cause elastic walls to collapse due to negative pressure. This fluid-structure instability is crucial for designing electrokinetic systems with flexible components.

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Area of Science:

  • Fluid dynamics
  • Soft matter physics
  • Electrokinetics

Background:

  • Electro-osmotic flow (EOF) is a key phenomenon in microfluidics and lab-on-a-chip devices.
  • The interaction between fluid flow and elastic structures can lead to complex instabilities.
  • Soft materials are increasingly used in microfluidic applications, necessitating an understanding of their mechanical behavior under flow.

Purpose of the Study:

  • To demonstrate and characterize a novel fluid-structure instability in soft electrokinetic systems.
  • To investigate the mechanism by which electro-osmotic flow induces elastic wall collapse.
  • To identify the critical conditions and dynamic regimes governing this instability.

Main Methods:

  • Experimental investigation of fluid flow within a soft elastic chamber under an applied electric field.
  • Theoretical analysis to model the electro-osmotic flow and its interaction with the elastic substrate.
  • Identification of instability thresholds and characterization of dynamic regimes through observation and measurement.

Main Results:

  • A fluid-structure instability was observed, driven by the interaction of electro-osmotic flow and an elastic substrate.
  • Above a critical electric field, negative gauge pressure generated by EOF caused the elastic walls of the chamber to collapse.
  • Distinct dynamic regimes of instability were identified, dependent on flow and material properties.

Conclusions:

  • The study reveals a critical instability in soft electrokinetic systems due to EOF-induced negative pressure.
  • Understanding this instability is vital for the reliable design and operation of microfluidic devices incorporating soft or elastic components.
  • This work provides fundamental insights into the behavior of electrokinetic flows interacting with deformable boundaries.