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An optimised split-and-recombine micro-mixer with uniform chaotic mixing
F Schönfeld1, V Hessel, C Hofmann
1Institut für Mikrotechnik Mainz GmbH (IMM), Carl-Zeiss-Str. 18-20, 55129 Mainz, Germany. schoenfeld@imm-mainz.de
Lab on a Chip
|March 10, 2004
Summary
This study presents an optimized micro-mixer using the split-and-recombine principle. It efficiently mixes viscous fluids, validated by computational fluid dynamics and experimental results.
Area of Science:
- Fluid Dynamics
- Microfluidics
- Chemical Engineering
Background:
- Micro-mixers are crucial for efficient fluid processing.
- Optimizing mixing in microfluidic devices, especially for viscous fluids, remains a challenge.
Purpose of the Study:
- To present a second-generation, optimized micro-mixer based on the split-and-recombine principle.
- To investigate its mixing performance across a range of Reynolds numbers.
Main Methods:
- Computational Fluid Dynamics (CFD) simulations were employed to analyze mixing performance.
- Experimental validation was conducted using water-glycerol solutions.
Main Results:
- The micro-mixer demonstrated high mixing efficiency, characterized by positive finite-time Lyapunov exponents.
- CFD predicted near-ideal multi-lamination at low Reynolds numbers (Re < 15).
- Experimental results showed excellent agreement with CFD predictions.
Conclusions:
- The developed micro-mixer is highly effective for mixing viscous fluids.
- The split-and-recombine principle, when optimized, leads to efficient and uniform mixing.
- The study validates CFD as a reliable tool for micro-mixer design and performance prediction.