Flow profiling of a surface acoustic wave nanopump

Details Flow profiling of a surface acoustic wave nanopump Flow profiling of a surface acoustic wave nanopump

2004-05-10

arxiv.org/abs/cond-mat/0405199v1

Phys. Rev. E 70, 056311 (2004)

Physics

Condensed Matter

Soft Condensed Matter

12 pages 20 figures

Scientific paper

10.1103/PhysRevE.70.056311

The flow profile in a capillary gap and the pumping efficiency of an acoustic micropump employing Surface Acoustic Waves is investigated both experimentally and theoretically. Such ultrasonic surface waves on a piezoelectric substrate strongly couple to a thin liquid layer and generate an internal streaming within the fluid. Such acoustic streaming can be used for controlled agitation during, e.g., microarray hybridization. We use fluorescence correlation spectroscopy and fluorescence microscopy as complementary tools to investigate the resulting flow profile. The velocity was found to depend on the applied power somewhat weaker than linearly and to decrease fast with the distance from the ultrasound generator on the chip.

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