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Enhancement of Acoustic Energy Density in Bulk-Wave-Acoustophoresis Devices Using Side Actuation

Qiu, Wei LU orcid ; Baasch, Thierry LU and Laurell, Thomas LU (2022) In Physical Review Applied 17(4).
Abstract
A high acoustic energy density is required in the acoustic resonator to increase the throughput of acoustophoresis devices. In this study, through both experiments and numerical simulations, we find that the energy density in bulk-wave-acoustophoresis devices can be enhanced by actuating the device from the side. Based on qualitative free-flow focusing experiments, side actuation shows clear superiority to bottom actuation under various input powers and flow rates. Quantitative measurements using confocal microparticle image velocimetry confirm an increase by a factor of 4 in energy density using side actuation. Numerical simulations reveal that side actuation leads to significant symmetry breaking, which accounts for strong acoustic... (More)
A high acoustic energy density is required in the acoustic resonator to increase the throughput of acoustophoresis devices. In this study, through both experiments and numerical simulations, we find that the energy density in bulk-wave-acoustophoresis devices can be enhanced by actuating the device from the side. Based on qualitative free-flow focusing experiments, side actuation shows clear superiority to bottom actuation under various input powers and flow rates. Quantitative measurements using confocal microparticle image velocimetry confirm an increase by a factor of 4 in energy density using side actuation. Numerical simulations reveal that side actuation leads to significant symmetry breaking, which accounts for strong acoustic fields in the channel, and the device energy-conversion efficiency using side actuation is also higher than that using bottom actuation for different device aspect ratios. Submicrometer particle focusing is performed using an acoustophoresis device with side actuation and more than 90% of 500-nm-diameter particles are focused under a total flow rate of 30 μl/min at an input power of 235 mW, achieved without using a power amplifier. (Less)
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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Applied
volume
17
issue
4
article number
044043
pages
14 pages
publisher
American Physical Society
external identifiers
  • scopus:85129332190
ISSN
2331-7019
DOI
10.1103/PhysRevApplied.17.044043
language
English
LU publication?
yes
id
967cf638-4652-4fb2-94df-5f39e58974b6
date added to LUP
2022-04-22 20:04:21
date last changed
2025-04-04 14:22:34
@article{967cf638-4652-4fb2-94df-5f39e58974b6,
  abstract     = {{A high acoustic energy density is required in the acoustic resonator to increase the throughput of acoustophoresis devices. In this study, through both experiments and numerical simulations, we find that the energy density in bulk-wave-acoustophoresis devices can be enhanced by actuating the device from the side. Based on qualitative free-flow focusing experiments, side actuation shows clear superiority to bottom actuation under various input powers and flow rates. Quantitative measurements using confocal microparticle image velocimetry confirm an increase by a factor of 4 in energy density using side actuation. Numerical simulations reveal that side actuation leads to significant symmetry breaking, which accounts for strong acoustic fields in the channel, and the device energy-conversion efficiency using side actuation is also higher than that using bottom actuation for different device aspect ratios. Submicrometer particle focusing is performed using an acoustophoresis device with side actuation and more than 90% of 500-nm-diameter particles are focused under a total flow rate of 30 μl/min at an input power of 235 mW, achieved without using a power amplifier.}},
  author       = {{Qiu, Wei and Baasch, Thierry and Laurell, Thomas}},
  issn         = {{2331-7019}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{4}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Applied}},
  title        = {{Enhancement of Acoustic Energy Density in Bulk-Wave-Acoustophoresis Devices Using Side Actuation}},
  url          = {{http://dx.doi.org/10.1103/PhysRevApplied.17.044043}},
  doi          = {{10.1103/PhysRevApplied.17.044043}},
  volume       = {{17}},
  year         = {{2022}},
}