Anomalous microfluidic phonons induced by the interplay of hydrodynamic screening and incompressibility

Tsevi Beatus*, Roy Bar-Ziv, Tsvi Tlusty

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

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 nonmonotonous behavior of the phonon spectra is explained theoretically by the interplay of screening and plug flow.

Original languageAmerican English
Article number124502
JournalPhysical Review Letters
Volume99
Issue number12
DOIs
StatePublished - 20 Sep 2007
Externally publishedYes

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