Streaming and Sorting: Manipulating fluid and microparticles with oscillating interfaces

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• Sascha Hilgenfeldt (University of Illinois)
• Wednesday 17 May 2017, 13:00-14:00
• MR11, Centre for Mathematical Sciences, Wilberforce Road, Cambridge.

If you have a question about this talk, please contact Julius Bier Kirkegaard.

Microbubbles driven to oscillations at ultrasound frequencies provide an exemplary system for the study of rectification effects in microfluidics: The trajectories of both fluid elements and microparticles show steady dynamics as a result of non-trivial averaging over the oscillations. In experiments, we demonstrate strong, versatile steady streaming as well as the controlled application of inertial lift forces for sensitive microparticle separation by size. The oscillatory and steady flow components can be understood analytically by asymptotic analysis, and are used as input for a theory of particle lift based on a Maxey-Riley-like force balance. The predicted particle displacements match experimental observations and generalize both shear-induced migration and secondary radiation forces.

This talk is part of the DAMTP BioLunch series.

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