Microtransport induced by ultrasonic Lamb waves
- 12 August 1991
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 59 (7) , 774-776
- https://doi.org/10.1063/1.105339
Abstract
We have observed pumping of water induced by 4.7 MHz ultrasonic Lamb waves traveling in a 4‐μm‐thick composite membrane of silicon nitride and piezoelectric zinc oxide. The observed pumping speed is proportional to the square of the wave amplitude; the speed was 100 μm/s for a rf drive voltage of 8 V and a 6.5 nm wave amplitude. A nonlinear model based on acoustic streaming theory predicts velocities in good agreement with experiment.Keywords
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