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Suppression of acoustic streaming by the inhomogeneity-induced acoustic body force

Qiu, Wei LU ; Karlsen, Jonas ; Bruus, Henrik and Augustsson, Per LU (2018) 21st International Symposium on Nonlinear Acoustics, ISNA 2018 In Proceedings of Meetings on Acoustics 34(1).
Abstract

Rayleigh streaming in a homogeneous fluid has been extensively studied, and plays an important role in the manipulation of particles in microscale acoustofluidics. In this work, the acoustic streaming is investigated in a glass-silicon microchannel as it evolves in fluids made inhomogeneous in density and compressibility (or speed of sound) by the addition of solute molecules. It is found that the streaming is greatly suppressed in the bulk, due to the competition between the boundary-induced streaming stress and the inhomogeneity-induced acoustic body force. The streaming rolls are initially confined to a narrow region close to the walls, then expand from the walls into the bulk as the inhomogeneity is smeared out by diffusion and... (More)

Rayleigh streaming in a homogeneous fluid has been extensively studied, and plays an important role in the manipulation of particles in microscale acoustofluidics. In this work, the acoustic streaming is investigated in a glass-silicon microchannel as it evolves in fluids made inhomogeneous in density and compressibility (or speed of sound) by the addition of solute molecules. It is found that the streaming is greatly suppressed in the bulk, due to the competition between the boundary-induced streaming stress and the inhomogeneity-induced acoustic body force. The streaming rolls are initially confined to a narrow region close to the walls, then expand from the walls into the bulk as the inhomogeneity is smeared out by diffusion and advection, and finally the homogeneous state is reached. The efficient suppression of streaming enables manipulation of submicron particles using acoustophoresis.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Proceedings of Meetings on Acoustics
volume
34
issue
1
article number
045023
publisher
Acoustical Society of America
conference name
21st International Symposium on Nonlinear Acoustics, ISNA 2018
conference location
Santa Fe, United States
conference dates
2018-07-09 - 2018-07-13
external identifiers
  • scopus:85064971294
ISSN
1939-800X
DOI
10.1121/2.0000885
language
English
LU publication?
yes
id
b9a97fb1-0241-43c1-b4aa-0db73c8ad866
date added to LUP
2019-05-17 15:03:51
date last changed
2020-01-13 01:49:16
@article{b9a97fb1-0241-43c1-b4aa-0db73c8ad866,
  abstract     = {<p>Rayleigh streaming in a homogeneous fluid has been extensively studied, and plays an important role in the manipulation of particles in microscale acoustofluidics. In this work, the acoustic streaming is investigated in a glass-silicon microchannel as it evolves in fluids made inhomogeneous in density and compressibility (or speed of sound) by the addition of solute molecules. It is found that the streaming is greatly suppressed in the bulk, due to the competition between the boundary-induced streaming stress and the inhomogeneity-induced acoustic body force. The streaming rolls are initially confined to a narrow region close to the walls, then expand from the walls into the bulk as the inhomogeneity is smeared out by diffusion and advection, and finally the homogeneous state is reached. The efficient suppression of streaming enables manipulation of submicron particles using acoustophoresis.</p>},
  author       = {Qiu, Wei and Karlsen, Jonas and Bruus, Henrik and Augustsson, Per},
  issn         = {1939-800X},
  language     = {eng},
  number       = {1},
  publisher    = {Acoustical Society of America},
  series       = {Proceedings of Meetings on Acoustics},
  title        = {Suppression of acoustic streaming by the inhomogeneity-induced acoustic body force},
  url          = {http://dx.doi.org/10.1121/2.0000885},
  doi          = {10.1121/2.0000885},
  volume       = {34},
  year         = {2018},
}