Frequency dependence of microflows upon acoustic interactions with fluids

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Tiller, Benjamin and Reboud, Julien and Manlio, Tassieri and Wilson, Rab and Cooper, Jonathan M. (2017) Frequency dependence of microflows upon acoustic interactions with fluids. Physics of Fluids, 29 (12). 122008. ISSN 1070-6631 (https://doi.org/10.1063/1.4999308)

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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.

  • Item type:Article
    ID code:62769
    Dates:
    Date
    Event
    26 December 2017
    Published
    2 December 2017
    Accepted
    Notes:This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in 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] and may be found at http://aip.scitation.org/doi/10.1063/1.4999308.
    Subjects:Technology > Engineering (General). Civil engineering (General) > Bioengineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:09 Jan 2018 11:48
    Last modified:11 Nov 2024 11:52
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/62769
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