TY - JOUR
T1 - Anomalous microfluidic phonons induced by the interplay of hydrodynamic screening and incompressibility
AU - Beatus, Tsevi
AU - Bar-Ziv, Roy
AU - Tlusty, Tsvi
PY - 2007/9/20
Y1 - 2007/9/20
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=34648814071&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.99.124502
DO - 10.1103/PhysRevLett.99.124502
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AN - SCOPUS:34648814071
SN - 0031-9007
VL - 99
JO - Physical Review Letters
JF - Physical Review Letters
IS - 12
M1 - 124502
ER -