Micromixing using swirling induced by three-dimensional dual surface acoustic waves (3D-dSAW)

Jeonghun Nam, Chae Seung Lim

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


Efficient mixing in a microfluidic system is difficult to achieve, since it is dependent solely on molecular diffusion due to low Reynolds number. In this paper, we newly propose a novel mixing technique using three-dimensional dual surface acoustic waves (3D-dSAWs) generated from two interdigitated transducers of top and bottom piezoelectric substrates. By using the 3D-dSAW, internal swirling in a single direction is induced, which can facilitate more efficient mixing of a fluorescent particle suspension and deionized water. Therefore, by using the 3D-dSAW mixer, higher efficiency mixing performance can be achieved compared to the single SAW mixer at the same flow rate and applied voltage. With the applied voltage of 14 V, 3D-dSAW mixing device could achieve 100% mixing efficiency at the flow rate of 50 μl/min, while the mixing efficiency of the traditional single SAW mixer was approximately 38%. Moreover, the throughput of 3D-dSAW mixing device could be enhanced up to 120 μl/min with the applied voltage of 18 V, at which the measured temperature was lower than 40 °C and the efficiency could reach approximately ∼95.6%.

Original languageEnglish
Pages (from-to)3434-3440
Number of pages7
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 2018 Feb

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (No. 2016R1C1B1014991 ). We thank Prof. Sangho Kim and Dr. Meongkeun Ju of the Department of Biomedical Engineering, National University of Singapore, for partial financial support for this research and for the Lattice Boltzmann method (LBM) simulation.

Publisher Copyright:
© 2017 Elsevier B.V.


  • Acoustic streaming
  • Micromixer
  • Surface acoustic wave
  • Swirling

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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