Mixing Enhancement in Serpentine Micromixers with a Non-Rectangular Cross-Section

Area of Science:

• Fluid Dynamics
• Microfluidics
• Chemical Engineering

Background:

• Serpentine and spiral micromixers utilize Dean flows for mixing in pressure-driven systems.
• Existing designs often lack control over transversal flow rotation, limiting mixing efficiency.

Purpose of the Study:

• To investigate a novel serpentine micromixer with non-rectangular cross-sections.
• To enhance fluid mixing by controlling transversal flow rotation and introducing extensional flows.

Main Methods:

• Numerical simulation using Navier-Stokes and concentration-diffusion equations.
• Analysis of fluid flow characteristics and mixing quality via an entropic mixing index.

Main Results:

• The new micromixer design demonstrates superior performance compared to simple serpentine channels.
• Consistent mixing efficiency observed across a range of Reynolds numbers.
• Maximum mixing achieved at Reynolds numbers as low as 20 within four mixing units.

Conclusions:

• The novel micromixer design effectively enhances mixing through controlled vortex dynamics.
• This design offers a more efficient and consistent mixing solution for microfluidic applications.
• Effective mixing is achievable at low Reynolds numbers, broadening potential applications.