Phys. Rev. Lett. 100, 034502 (2008) [4 pages]Microfluidic Mixing via Acoustically Driven Chaotic AdvectionReceived 2 August 2007; published 24 January 2008 Mixing presents a notoriously difficult problem in small amounts of fluids. Herein, surface acoustic waves provide a convenient technique to generate time-dependent flow patterns. These flow patterns can be optimized in such a way that advected particles are mixed most efficiently in the fluid within a short time compared to the time pure diffusion would take. Investigations are presented for the mixing efficiency of a flat cylinder that is driven by two surface acoustic waves. The experimental results favorably agree with model calculations of the flow patterns and the advective transport. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.034502
DOI:
10.1103/PhysRevLett.100.034502
PACS:
47.61.Ne, 47.15.G−, 47.52.+j, 47.85.lk
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