Modeling of microdevices for SAW-based acoustophoresis - A study of boundary conditions

Nils Refstrup Skov, Henrik Bruus

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Abstract

We present a finite-element method modeling of acoustophoretic devices consisting of a single, long, straight, water-filled microchannel surrounded by an elastic wall of either borosilicate glass (pyrex) or the elastomer polydimethylsiloxane (PDMS) and placed on top of a piezoelectric transducer that actuates the device by surface acoustic waves (SAW). We compare the resulting acoustic fields in these full solid-fluid models with those obtained in reduced fluid models comprising of only a water domain with simplified, approximate boundary conditions representing the surrounding solids. The reduced models are found to only approximate the acoustically hard pyrex systems to a limited degree for large wall thicknesses and but not very well for acoustically soft PDMS systems shorter than the PDMS damping length of 3 mm.
Original languageEnglish
Article number182
JournalMicromachines
Volume7
Issue number10
Number of pages14
ISSN2072-666X
DOIs
Publication statusPublished - 2016

Keywords

  • Microdevices
  • Acoustofluidics
  • Surface acoustic waves
  • Numeric modeling
  • Hard wall
  • Lossy wall
  • Polydimethylsiloxane (PDMS)
  • Borosilicate glass (pyrex)

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