Anomalous Microfluidic Phonons Induced by the Interplay of Hydrodynamic Screening and Incompressibility

Details Anomalous Microfluidic Phonons Induced by the Interplay of Hydrodynamic Screening and Incompressibility Anomalous Microfluidic Phonons Induced by the Interplay of Hydrodynamic Screening and Incompressibility

2010-08-09

arxiv.org/abs/1008.1473v1

Phys. Rev. Lett. 99, 124502 (2007) [4 pages]

Physics

Fluid Dynamics

http://link.aps.org/doi/10.1103/PhysRevLett.99.124502 http://www.weizmann.ac.il/complex/tlusty/papers/PhysRevLett2007.pdf

Scientific paper

10.1103/PhysRevLett.99.124502

We investigate the acoustic normal modes ("phonons") of a 1D microfluidic droplet crystal at the crossover between 2D flow and confined 1D plug flow. The unusual phonon spectra of the crystal, which arise from long-range hydrodynamic interactions, change anomalously under confinement. The boundaries induce weakening and screening of the interactions, but when approaching the 1D limit we measure a marked increase in the crystal sound velocity, a sign of interaction strengthening. This non-monotonous behavior of the phonon spectra is explained theoretically by the interplay of screening and plug flow.

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