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Microfluidic Mixers for Studying Protein Folding
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3D Printed Microfluidic Mixers-A Comparative Study on Mixing Unit Performances.

Anton Enders1, Ina G Siller1, Katharina Urmann2

  • 1Institute of Technical Chemistry, Leibniz University Hannover, Callinstraße 5, 30167, Hannover, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|December 15, 2018
PubMed
Summary

3D printed passive micromixers offer efficient fluid mixing in microfluidic devices. HC and Tesla-like designs show superior performance, enabling rapid mixing crucial for biological and chemical applications.

Keywords:
3D printingadditive manufacturinglab on a chipmicrofluidicsmicromixers

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Area of Science:

  • Microfluidics
  • 3D Printing
  • Chemical Engineering

Background:

  • Microfluidic systems rely on laminar flow, where molecular diffusion is the primary mixing mechanism.
  • Passive mixing structures are essential to enhance mixing efficiency and reduce time in microfluidic devices.
  • Traditional microfabrication is costly and time-consuming, driving the need for alternative methods like 3D printing.

Purpose of the Study:

  • To redesign and fabricate five known passive micromixers using high-definition MultiJet 3D printing.
  • To evaluate and compare the mixing performance of these 3D printed micromixers.
  • To analyze mixing efficiency across a range of flow rates using experimental and numerical methods.

Main Methods:

  • Redesign of five passive micromixers to comparable dimensions.
  • Fabrication of micromixers using high-definition MultiJet 3D printing.
  • Experimental evaluation using sodium hydroxide and phenolphthalein solutions.
  • Numerical analysis using computational fluid dynamics (CFD).

Main Results:

  • HC and Tesla-like mixers achieved complete mixing in 0.99 s and 0.78 s, respectively, at the highest flow rate (Re = 37.04).
  • Caterpillar mixers demonstrated slower mixing, with complete mixing at 1.46 s and 1.9 s.
  • The HC mixer exhibited consistent, good mixing performance across all tested flow rates (Re = 3.7 to 37.04).

Conclusions:

  • High-definition MultiJet 3D printing is a viable method for fabricating passive micromixers.
  • HC and Tesla-like micromixer designs offer superior mixing efficiency compared to Caterpillar designs.
  • The HC mixer's robust performance across various flow rates makes it a promising candidate for microfluidic applications.