Interaction of spheres in oscillatory fluid flows.
Interaction of spheres in oscillatory fluid flows.
复制标题
振荡流体流动中球体的相互作用。
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
P. King
中科院分区：
文献类型：
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作者：
D. Klotsa;M. Swift;R. Bowley;P. King
刚性球形颗粒在振荡流体流中由于流体介导的相互作用而形成有趣的结构。在这里，我们表明，在水平振动下的球体与振动成直角排列，并且它们之间有间隙。这种行为的细节已经通过实验和模拟进行了研究。我们已经进行了实验，其中一对不锈钢球体在充满三种不同粘度的甘油-水流体混合物的细胞中以各种频率和振幅振荡。由于长程吸引和短程排斥，粒子之间存在平衡间隙。发现差距的大小取决于流体粘度和振动参数，并且我们已经确定了两个不同的缩放制度的差距对系统参数的依赖性。使用Navier-Stokes求解器模拟了相同的系统。测量了球体之间的相互作用力，并确定了由运动引起的流动。
Rigid spherical particles in oscillating fluid flows form interesting structures as a result of fluid mediated interactions. Here we show that spheres under horizontal vibration align themselves at right angles to the oscillation and sit with a gap between them. The details of this behavior have been investigated through experiments and simulations. We have carried out experiments in which a pair of stainless steel spheres is shaken horizontally in a cell filled with glycerol-water fluid mixtures of three different viscosities, at various frequencies and amplitudes of oscillation. There is an equilibrium gap between the particles resulting from a long-range attraction and a short-range repulsion. The size of the gap was found to depend on the fluid viscosity and the vibratory parameters, and we have identified two distinct scaling regimes for the dependence of the gap on the system parameters. Using a Navier-Stokes solver the same system was simulated. The interaction force between the spheres was measured and the streaming flows induced by the motion were determined.