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

被引：60

作者：

Beatus, Tsevi ^{[1
]}

Bar-Ziv, Roy

Tlusty, Tsvi

机构：

[1] Weizmann Inst Sci, Dept Mat & Interfaces, IL-76100 Rehovot, Israel

[2] Weizmann Inst Sci, Dept Phys Complex Syst, IL-76100 Rehovot, Israel

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.99.124502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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