Frequency dependence of microflows upon acoustic interactions with fluids

Benjamin Tiller, Julien Reboud, Tassieri Manlio, Rab Wilson, Jonathan M. Cooper

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Rayleigh surface acoustic waves (SAWs), generated on piezoelectric substrates, can interact with liquids to generate fast streaming flows. Although studied extensively, mainly phenomenologically, the effect of the SAW frequency on streaming in fluids in constrained volumes is not fully understood, resulting in sub-optimal correlations between models and experimental observations. Using microfluidic structures to reproducibly define the fluid volume, we use recent advances modeling the body force generated by SAWs to develop a deeper understanding of the effect of acoustic frequency on the magnitude of streaming flows. We implement this as a new predictive tool using a finite element model of fluid motion to establish optimized conditions for streaming. The model is corroborated experimentally over a range of different acoustic excitation frequencies enabling us to validate a design tool, linking microfluidic channel dimensions with frequencies and streaming efficiencies. We show that in typical microfluidic chambers, the length and height of the chamber are critical in determining the optimum frequency, with smaller geometries requiring higher frequencies.
LanguageEnglish
Article number122008
Number of pages8
JournalPhysics of Fluids
Volume29
Issue number12
DOIs
Publication statusPublished - 26 Dec 2017

Fingerprint

Microfluidics
Acoustic streaming
Surface waves
Acoustics
Acoustic waves
Fluids
acoustics
fluids
chambers
interactions
acoustic excitation
acoustic frequencies
Geometry
Liquids
Substrates
liquids
geometry

Keywords

  • surface acoustic waves
  • ultrasonic radiation force
  • hydrodynamic pumps

Cite this

Tiller, B., Reboud, J., Manlio, T., Wilson, R., & Cooper, J. M. (2017). Frequency dependence of microflows upon acoustic interactions with fluids. Physics of Fluids, 29(12), [122008 ]. https://doi.org/10.1063/1.4999308
Tiller, Benjamin ; Reboud, Julien ; Manlio, Tassieri ; Wilson, Rab ; Cooper, Jonathan M. / Frequency dependence of microflows upon acoustic interactions with fluids. In: Physics of Fluids. 2017 ; Vol. 29, No. 12.
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Tiller, B, Reboud, J, Manlio, T, Wilson, R & Cooper, JM 2017, 'Frequency dependence of microflows upon acoustic interactions with fluids' Physics of Fluids, vol. 29, no. 12, 122008 . https://doi.org/10.1063/1.4999308

Frequency dependence of microflows upon acoustic interactions with fluids. / Tiller, Benjamin; Reboud, Julien; Manlio, Tassieri; Wilson, Rab ; Cooper, Jonathan M.

In: Physics of Fluids, Vol. 29, No. 12, 122008 , 26.12.2017.

Research output: Contribution to journalArticle

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Tiller B, Reboud J, Manlio T, Wilson R, Cooper JM. Frequency dependence of microflows upon acoustic interactions with fluids. Physics of Fluids. 2017 Dec 26;29(12). 122008 . https://doi.org/10.1063/1.4999308