Measurements of the steady streaming flow around oscillating spheres using three dimensional particle tracking velocimetry
Measurements of the steady streaming flow around oscillating spheres using three dimensional particle tracking velocimetry
复制标题
使用三维粒子跟踪测速仪测量振荡球体周围的稳定流动
DOI：
10.1063/1.2973204
复制
发表时间：
2007
影响因子：
4.6
通讯作者：
G. Voth
中科院分区：
文献类型：
--
作者：
F. Otto;Emmalee K. Riegler;G. Voth
人们发现，在流体中振动的颗粒具有自组织特性，颗粒之间存在相互吸引和排斥的相互作用。这些相互作用归因于围绕振荡颗粒的稳定流动。在这里，我们用三维粒子跟踪测速技术研究了垂直振荡球体周围的定常流动。我们给出了球体远离边界，靠近储罐底壁，靠近另一个振荡球体的流动测量结果。对于颗粒自组织感兴趣的参数，远离边界的单个球体周围的流动与应用于颗粒组织的分析计算显著不同。测量的停滞点位置支持先前观察到的小幅度标度，并演示了这种标度在大幅度下是如何变化的。当球体在底壁附近振荡时，流动的拓扑结构发生变化，导致较大的...
Granular particles vibrated in a fluid have been found to exhibit self-organization with attractive and repulsive interactions between the particles. These interactions have been attributed to the steady streaming flow around oscillating particles. Here we examine the steady streaming flow surrounding a vertically oscillating sphere using three-dimensional particle tracking velocimetry. We present measurements of the flow with the sphere far from boundaries, close to the bottom wall of the tank, and near another oscillating sphere. For parameters of interest for granular self-organization, the flow around a single sphere far from boundaries differs significantly from an analytical calculation that has been applied to granular organization. Measured positions of the stagnation point support previously observed scaling at small amplitudes, and demonstrate how this scaling changes at large amplitudes. When the sphere is oscillated near the bottom wall, the topology of the flow changes, resulting in a larger ...