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Related Experiment Videos

Electro-hydrodynamic micro-fluidic mixer.

Ahmed Ould El Moctar1, Nadine Aubry, John Batton

  • 1Department of Mechanical Engineering and New Jersey Center for Micro-Flow Control, New Jersey Institute of Technology, Newark, NJ 07102, USA.

Lab on a Chip
|March 10, 2004
PubMed
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This study introduces a micro-mixer utilizing electro-hydrodynamic (EHD) forces for efficient fluid mixing in microchannels. The novel design achieves rapid and effective mixing using electrical properties, overcoming common challenges in microfluidic applications.

Area of Science:

  • Microfluidics
  • Electrokinetics
  • Chemical Engineering

Background:

  • Fluid mixing in microchannels is crucial for applications like bio-arrays and micro-reactors.
  • Achieving efficient mixing in microchannels presents significant challenges due to low Reynolds numbers and laminar flow regimes.

Purpose of the Study:

  • To propose and experimentally demonstrate a simple micro-mixer design based on electro-hydrodynamic (EHD) forces.
  • To investigate the effectiveness of EHD-driven mixing for fluids with differing electrical properties.

Main Methods:

  • A micro-mixer geometry was designed utilizing electrodes to generate an electric field perpendicular to the fluid interface.
  • The technique was experimentally validated using two liquids with identical viscosity and density but different electrical properties.

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  • The influence of direct current (DC) and alternating current (AC) electric fields (sinusoidal and square) on mixing was explored.

    • Main Results:

    • The EHD micro-mixer successfully induced transversal secondary flow, leading to efficient fluid mixing.
    • Very good mixing was achieved in less than 0.1 seconds and over a short distance (within a fraction of the 250 micrometer channel width).
    • The experimental conditions involved a volume flow rate of 0.26 µL/s and an average velocity of 4.2 mm/s (Reynolds number Re=0.0174).

    Conclusions:

    • The proposed EHD micro-mixer offers a simple yet effective solution for rapid fluid mixing in microchannels.
    • This method is particularly advantageous for applications requiring fast mixing of fluids with differing electrical characteristics.
    • The EHD-based approach demonstrates significant potential for advancing microfluidic device performance.