Frequency dependence of microflows upon acoustic interactions with fluids

Tiller, B., Reboud, J. , Tassieri, M. , Wilson, R. and Cooper, J. M. (2017) Frequency dependence of microflows upon acoustic interactions with fluids. Physics of Fluids, 29(12), 122008. (doi: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:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Tiller, Mr Benjamin and Wilson, Dr Robert and Tassieri, Dr Manlio and Cooper, Professor Jonathan and Reboud, Dr Julien
Authors: Tiller, B., Reboud, J., Tassieri, M., Wilson, R., and Cooper, J. M.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Physics of Fluids
Publisher:American Institute of Physics
ISSN:1070-6631
ISSN (Online):1089-7666
Published Online:26 December 2017
Copyright Holders:Copyright © 2017 American Institute of Physics
First Published:First published in Physics of Fluids 29(12):122008
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher.
Data DOI:10.5525/gla.researchdata.560

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
553521Next Generation Analytical Tools: Application to Protein Oxidations that affect Human Health and WellbeingJonathan CooperEngineering and Physical Sciences Research Council (EPSRC)EP/I017887/1ENG - BIOMEDICAL ENGINEERING
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534472Rheology at the Microscale: New Tools for Bio-analysisManlio TassieriEngineering and Physical Sciences Research Council (EPSRC)10216/101ENG - BIOMEDICAL ENGINEERING