Comparison of numerical models for bulk and surface acoustic wave-induced acoustophoresis in a microchannel
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
Accepted: 14 August 2020
Published online: 5 September 2020
Acoustophoresis induced by either bulk or surface acoustic wave has great potential to manipulate microparticles and biological substances because of its simple setup, low power consumption, and high generated force. Numerical models for simulating acoustophoresis in a microchannel are required to further understand the underlying mechanisms (i.e., standing acoustic wave and microparticle motion) and optimize the design. Simplified models that only consider the channel walls as actuation and impedance boundaries are available. In this study, full-sized models were established to include many phenomena and physical interactions involved and then compared with the simulation results using the simplified models. Distributions of acoustic pressure, streaming velocity, radiation force, and trajectory of 1 µm and 10 µm microparticles were calculated for further understanding of acoustofluidics. Overall, the full-sized models can provide an accurate guideline for the application and development of acoustophoresis.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020