An investigation of chaotic mixing behavior in a planar microfluidic mixer

Yuan S, Zhou M, Peng T, Li Q, Jiang F (2022)

Publication Type: Journal article

Publication year: 2022


Book Volume: 34

Journal Issue: 3

DOI: 10.1063/5.0082831


Achieving rapid mixing of different liquids in a short distance is important in various biochemical applications. Herein, a novel planar mixer with staggered Z-shaped baffles is proposed. Numerical investigations are carried out to evaluate its mixing ability based on mixing quality and pressure drop when the Reynolds number (Re) varies from 0.1 to 50. The Lyapunov exponent, the Poincare map, and the vortex visualization are conducted to comprehensively analyze the chaotic state and the mixing mechanism. Results show that the proposed mixer exceeds 0.9 mixing efficiency when 0.1 < Re and Re > 8. As Re > 8, different vortex patterns appear by changing the inlet configuration. The disturbance for fluids induced by a vortex on the mass transfer surface is not only dependent on its intensity but also related to the position of the vortex/vortex leg. The proposed planar mixer, inducing a single vortex or vortex pair with different directions, presents different mixing performance when the Re varies from 8 to 50, from which the approach of the rotating vortex that can mainly improve the mixing quality is found. This well explains the chaotic mixing behavior observed in the planar mixer with Z-shaped baffles, which to date has not been studied before. Furthermore, the micromixer is fabricated, tested, and applied for luminol-peroxide chemiluminescence detection to characterize its performance.

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Yuan, S., Zhou, M., Peng, T., Li, Q., & Jiang, F. (2022). An investigation of chaotic mixing behavior in a planar microfluidic mixer. Physics of Fluids, 34(3).


Yuan, Shuai, et al. "An investigation of chaotic mixing behavior in a planar microfluidic mixer." Physics of Fluids 34.3 (2022).

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