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A Three-Dimensional Micromixer Using Oblique Embedded Ridges.

Lin Li1, Qingde Chen1, Guodong Sui2

  • 1Department of Ocean & Mechanical Engineering, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431, USA.

Micromachines
|August 6, 2021
PubMed
Summary

This study presents a novel 3D micromixer that efficiently mixes fluids using splitting-recombination and chaotic advection. Its mixing length varies with Reynolds number, demonstrating effective performance for both normal and difficult-to-mix fluids.

Keywords:
chaotic advectioncomplete mixingmicromixervortex transverse flow

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Area of Science:

  • Microfluidics
  • Fluid Dynamics
  • Chemical Engineering

Background:

  • Micromixers are crucial components in microfluidic systems, enabling efficient fluid manipulation at small scales.
  • Effective mixing is essential for various applications, including chemical synthesis, biological assays, and diagnostics.
  • Existing micromixers often face challenges in fabrication, integration, and mass production.

Purpose of the Study:

  • To develop and characterize a novel three-dimensional (3D) micromixer with high mixing efficiency.
  • To investigate the mixing performance of the 3D micromixer across a range of parameters, particularly the Reynolds number (Re).
  • To validate the numerical model with experimental results for comprehensive understanding of the mixing dynamics.

Main Methods:

  • A 3D micromixer design based on splitting-recombination and chaotic advection principles.
  • Numerical modeling to simulate fluid flow and mixing performance.
  • Parametric analysis of mixing length as a function of Reynolds number for different fluid types.
  • Experimental verification of the micromixer's performance.

Main Results:

  • A critical Reynolds number (Re_critical) was identified, dictating the dominant mixing mechanism.
  • For Re < Re_critical, mixing length increased with Re due to splitting-recombination.
  • For Re > Re_critical, mixing length decreased with Re due to chaotic advection.
  • Complete mixing lengths of 500 µm (Re=0.007) to 2400 µm (Re=4.7) for normal fluids, and 650 µm (Re=66.7) were observed.
  • A mixing length of 2550 µm was achieved for hard-to-mix fluids.
  • Experimental results corroborated the numerical simulations, showing a similar trend of mixing length variation with Re.

Conclusions:

  • The developed 3D micromixer offers high efficiency, simple fabrication, and ease of integration.
  • The micromixer's performance is tunable via the Reynolds number, allowing optimization for different fluid properties.
  • The study provides valuable insights into the fluid dynamics governing mixing in microfluidic devices.
  • The findings support the potential of this 3D micromixer for diverse microfluidic applications.