Poloidal Flow and Toroidal Particle Ring Formation in a Sessile Drop Driven by Megahertz Order Vibration

被引：37

作者：

Rezk, Amgad R. ^{[1
]}

Yeo, Leslie Y. ^{[1
]}

Friend, James R. ^{[1
]}

机构：

[1] Royal Melbourne Inst Technol RMIT Univ, Micro Nanophys Res Lab, Melbourne, Vic 3000, Australia

来源：

LANGMUIR | 2014年 / 30卷 / 37期

基金：

澳大利亚研究理事会;

关键词：

Drops - Niobium compounds;

D O I：

10.1021/la502301f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Poloidal flow is curiously formed in a microliter sessile water drop over 157-225 MHz because of acoustic streaming from three-dimensional standing Lamb waves in a lithium niobate substrate. The flow possesses radial symmetry with downwelling at the center and upwelling around the periphery of the drop. Outside this frequency range, the attenuation occurs over a length scale incompatible with the drop size and the poloidal flow vanishes. Remarkably, shear-induced migration was found to drive toroidal particle ring formation with diameters inversely proportional to the frequency of the acoustic irradiation.

引用

收藏

页码：11243 / 11247

页数：5

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