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Medientyp:
E-Artikel
Titel:
Modeling of Microdevices for SAW-Based Acoustophoresis — A Study of Boundary Conditions
Beteiligte:
Skov, Nils;
Bruus, Henrik
Erschienen:
MDPI AG, 2016
Erschienen in:
Micromachines, 7 (2016) 10, Seite 182
Sprache:
Englisch
DOI:
10.3390/mi7100182
ISSN:
2072-666X
Entstehung:
Anmerkungen:
Beschreibung:
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.