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Micromachines
Volume 17
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10.3390/mi17091082
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Article

Controlling the Mixing Performance of Passive Micromixers with Variable Section Units

by
Lijun Yang
1,
Yu Hang
2,*,
Renjie Liu
1,
Qilin Jiang
1,
Zongan Li
3,*,
Jun Hong
4 and
Ye Wu
4
1
School of Mechanical Engineering, Nanjing Institute of Technology, Nanjing 211167, China
2
School of Artificial Intelligence, Nanjing Normal University of Special Education, Nanjing 210038, China
3
School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing 210046, China
4
School of Electrical and Information Engineering, Hunan Institute of Technology, Hengyang 421002, China
*
Authors to whom correspondence should be addressed.
Micromachines 2026, 17(9), 1082; https://doi.org/10.3390/mi17091082
Submission received: 18 August 2026 / Revised: 11 September 2026 / Accepted: 12 September 2026 / Published: 15 September 2026
(This article belongs to the Collection Micromixers: Analysis, Design and Fabrication)
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Abstract

Changing the structures of microchannels has become an effective strategy for improving the mixing performance of passive micromixers. In this study, we propose a novel micromixer with variable section units through changing the geometric parameters including the type, the position, the number, and the ratio of the variable section units. The effects of these geometric parameters on the mixing performance were numerically investigated and parametrically compared. The results showed that the type of Gra channel, the initial position, a number of 4, and the ratio of 1:4 should be selected. With this selected configuration, the mixing efficiency of the micromixer can be significantly enhanced, with the mixing index exceeding 0.96 at a Reynolds number of 100. These findings demonstrate an effective design strategy for developing passive micromixers.
Keywords: micromixers; mixing efficiency; geometric parameters; variable section units micromixers; mixing efficiency; geometric parameters; variable section units

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MDPI and ACS Style

Yang, L.; Hang, Y.; Liu, R.; Jiang, Q.; Li, Z.; Hong, J.; Wu, Y. Controlling the Mixing Performance of Passive Micromixers with Variable Section Units. Micromachines 2026, 17, 1082. https://doi.org/10.3390/mi17091082

AMA Style

Yang L, Hang Y, Liu R, Jiang Q, Li Z, Hong J, Wu Y. Controlling the Mixing Performance of Passive Micromixers with Variable Section Units. Micromachines. 2026; 17(9):1082. https://doi.org/10.3390/mi17091082

Chicago/Turabian Style

Yang, Lijun, Yu Hang, Renjie Liu, Qilin Jiang, Zongan Li, Jun Hong, and Ye Wu. 2026. "Controlling the Mixing Performance of Passive Micromixers with Variable Section Units" Micromachines 17, no. 9: 1082. https://doi.org/10.3390/mi17091082

APA Style

Yang, L., Hang, Y., Liu, R., Jiang, Q., Li, Z., Hong, J., & Wu, Y. (2026). Controlling the Mixing Performance of Passive Micromixers with Variable Section Units. Micromachines, 17(9), 1082. https://doi.org/10.3390/mi17091082

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