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High-energy-density acoustofluidic device using a double-parabolic ultrasonic transducer

Enrico Corato1, Ola Jakobsson1, Wei Qiu1, Takeshi Morita2, and Per Augustsson1,*

  • *Contact author: per.augustsson@bme.lth.se
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Phys. Rev. Applied 23, 024031 – Published 12 February, 2025

DOI: https://doi.org/10.1103/PhysRevApplied.23.024031

Abstract

High-acoustic-energy-density acoustofluidic devices are necessary to make this technology a viable option for clinical applications in the biomedical field. We present a mechanical interface that enables delivery of a high-amplitude acoustic field inside a fluid cavity by translating the vibrations from two large piezoelectric elements into a microfluidic chip. The study comprises both experimental characterization of a double-parabolic metallic acoustic waveguide and simulations of its working mechanism in two dimensions. We could focus 4.9-µm polystyrene particles at a flowrate of 5 ml/min, corresponding to an average retention time of 13.5 ms for particles in the actuated area. Moreover, we measured the acoustic energy density in the channel at stopped-flow condition, obtaining an average value of 1207 J/m3 and a maximum value of 2977 J/m3 with an input electrical power of 1.5 W. By comparing the simulation results with laser-Doppler vibrometer measurements, we confirmed that transverse sound waves play a significant role in the working mechanism of the double-parabolic structure, thus paving the way for further future optimization of the waveguide design.

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Outline

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Phys. Rev. Applied 23, 024031– Published 12 February, 2025
  • Received 25 June 2024
  • Revised 24 October 2024
  • Accepted 9 January 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by Bibsam.

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