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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

Rotating electro-osmotic flow over a plate or between two plates.

Chien-Cheng Chang1, Chang-Yi Wang

  • 1Division of Mechanics, Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan. mechang@iam.ntu.edu.tw

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 21, 2011
PubMed
Summary

Rotating electro-osmotic flow in channels is significantly impacted by rotation speed and channel width. Higher rotation reduces flow and alters its direction, leading to rigid body rotation at extreme speeds.

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Area of Science:

  • Fluid Dynamics
  • Electrokinetics
  • Non-Newtonian Fluid Mechanics

Background:

  • Electro-osmotic (EO) flow is crucial in microfluidic devices and biological systems.
  • Understanding fluid behavior under rotation is essential for various engineering applications.
  • The interplay between electric fields, fluid motion, and rotation presents complex phenomena.

Purpose of the Study:

  • To analyze the effects of rotation on electro-osmotic flow over a single infinite plate and between two parallel plates.
  • To investigate the influence of key dimensionless parameters, including rotation speed and electrokinetic width, on flow characteristics.
  • To characterize the axial and transverse flow behavior and the resulting volume transport patterns.

Main Methods:

  • Utilized the Debye-Hückel approximation for charge distribution analysis.
  • Applied the Navier-Stokes equation in a rotating frame for electrolyte transport.
  • Analyzed dimensionless parameters such as rotation speed (ω) and electrokinetic width (K).

Main Results:

  • Rotation significantly reduces axial flow and induces transverse flow in both single plate (SP) and two parallel plates (TP) cases.
  • For SP, increasing rotation (ω) shrinks the EO Ekman spiral, with transport turning from 45° to 90° relative to the electric field.
  • For TP, transverse flow peaks at ω ≈ 1, and transport angles from 0° to 45° with increasing ω; both cases exhibit rigid body rotation at high ω.

Conclusions:

  • Rotation speed (ω) is a critical parameter, influencing flow direction and magnitude.
  • Electrokinetic width (K) is important for channel flow, affecting transverse flow rates.
  • At high rotation speeds, flow ceases, resulting in rigid body rotation for both configurations.