Ostrovsky Lev
NOAA Earth Science Research Laboratory, University of Colorado, 325 Broadway, Boulder, Colorado 80305, USA.
J Acoust Soc Am. 2015 Dec;138(6):3607-12. doi: 10.1121/1.4936906.
This paper studies the collective dynamics of microparticles in plane and cylindrical resonators. Based on the known results regarding the motion of a single particle under the action of acoustic radiation force, concentration and separation of particles in standing waves are investigated. As an example, spherical particles (cells) with a slightly larger density and sound speed than those in ambient fluid are considered. Initial particle distribution is assumed to be almost homogeneous at the considered intervals. The formation of concentration peaks in plane standing waves and on the axis of a cylindrical system is demonstrated; additional concentration along the axis is possible. The possibility of an opposite process, i.e., keeping particles stirred by periodic change of acoustic wavelength, is confirmed as well. Distribution and separation of microbubbles of different sizes in a standing wave is also studied. Examples of available experimental data illustrating the relevance of the theory are given.
本文研究了平面和圆柱形谐振器中微粒的集体动力学。基于关于单个粒子在声辐射力作用下运动的已知结果，研究了驻波中粒子的聚集和分离。例如，考虑密度和声速略高于周围流体的球形粒子（细胞）。假设在所考虑的区间内初始粒子分布几乎是均匀的。证明了平面驻波和圆柱形系统轴线上浓度峰的形成；沿轴线可能会有额外的聚集。还证实了相反过程的可能性，即通过声波长的周期性变化使粒子保持搅拌状态。还研究了驻波中不同大小微泡的分布和分离。给出了说明该理论相关性的现有实验数据示例。
