Journal
ANNUAL REVIEW OF FLUID MECHANICS, VOL 46
Volume 46, Issue -, Pages 379-406Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-fluid-010313-141418
Keywords
ultrasonics; acoustics; lab on a chip; fluid-structural interaction; piezoelectrics; interfacial phenomena
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Fluid manipulations at the microscale and beyond are powerfully enabled through the use of 10-1,000-MHz acoustic waves. A superior alternative in many cases to other microfluidic actuation techniques, such high-frequency acoustics is almost universally produced by surface acoustic wave devices that employ electromechanical transduction in wafer-scale or thin-film piezoelectric media to generate the kinetic energy needed to transport and manipulate fluids placed in adjacent microfluidic structures. These waves are responsible for a diverse range of complex fluid transport phenomena-from interfacial fluid vibration and drop and confined fluid transport to jetting and atomization-underlying a flourishing research literature spanning fundamental fluid physics to chip-scale engineering applications. We highlight some of this literature to provide the reader with a historical basis, routes for more detailed study, and an impression of the field's future directions.
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