4.5 Article

Detailed numerical simulation and experimental investigation on micromixers with serpentine Koch fractal microchannels

Journal

INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Volume 35, Issue 22, Pages -

Publisher

WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217979221502283

Keywords

Passive micromixer; numerical simulation; Koch fractal; microchannel structure design

Funding

  1. Young Taishan Scholars Program of Shandong Province of China [tsqn202103091]
  2. Shandong Provincial Natural Science Foundation [ZR2021JQ]

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This paper investigates the design of a novel passive micromixer and optimization of mixing efficiency. Through continuous optimization of the micromixer structure, the mixing efficiency has been significantly improved to over 95%.
Micromixer is a kind of microfluidic chip for fast mixing and analysis. Mixing in a micromixer is usually a micron scale. At low Reynolds number, the fluid in the channel is laminar flow, which mainly depends on molecular diffusion as the main mixing mode. Fluid mixing in microchannels is very difficult, especially when the viscosity of the fluid is high. In this paper, we design a novel passive micromixer. The effects of fractal number, Koch fractal channel spacing, microchannel depth and cross-section shape on mixing efficiency were studied. Through a large number of numerical simulations, we continue to optimize the structure of the micromixer and improve the mixing efficiency. Finally, through the continuous optimization of the structure of the micromixer, the mixing efficiency of the micromixer can reach more than 95%.

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