Journal
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 470, Issue 2169, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rspa.2013.0765
Keywords
acoustic streaming; micro- and nano-scale fluid phenomena; surface acoustic waves; flow reversal
Categories
Funding
- CSIRO Flagship Grant on Sensors Systems for Analysis of Aquatic Environments
- Australian Research Council grants [DP120100013, DP120100835]
- Australian Research Council [DP0985253]
- Melbourne Centre for Nanofabrication
- RMIT University
- Australian Research Council [DP0985253] Funding Source: Australian Research Council
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Arising from an interplay between capillary, acoustic and intermolecular forces, surface acoustic waves (SAWs) are observed to drive a unique and curious double flow reversal in the spreading of thin films. With a thickness at or less than the submicrometre viscous penetration depth, the film is seen to advance along the SAW propagation direction, and self-similarly over time t(1/4) in the inertial limit. At intermediate film thicknesses, beyond one-fourth the sound wavelength lambda(l) in the liquid, the spreading direction reverses, and the film propagates against the direction of the SAW propagation. The film reverses yet again, once its depth is further increased beyond one SAW wavelength. An unstable thickness region, between lambda(l)/8 and lambda(l)/4, exists from which regions of the film either rapidly grow in thickness to exceed lambda(l)/4 and move against the SAW propagation, consistent with the intermediate thickness films, whereas other regions decrease in thickness below lambda(l)/8 to conserve mass and move along the SAW propagation direction, consistent with the thin submicrometre films.
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