Measurements of particle dynamics of neutrally buoyant suspensions of non‐Brownian glass beads in a Couette cell using dynamic sound scattering are reported. The dynamics were studied under steady shear flow across the entire gap between the stator and rotor for shear rates from 0.26 to 6.59 s ⁻¹ and particle concentrations from 20% to 50%, thereby enabling a comprehensive investigation of the dynamics to be carried out. The average particle velocity profile varies linearly with depth inside the cell for all shear rates and concentrations. The fluctuations in the particle velocities are large, indicating that the particles are not confined to streamlines but continue to fluctuate substantially during steady flow. Our data indicate that the fluctuations are anisotropic. The components of the velocity fluctuations (granular temperature) parallel to the flow and in the vertical direction are much larger than in the radial direction. The fluctuation anisotropy decreases as the concentration increases. © 2018 American Institute of Chemical Engineers AIChE J, 65: 840–849, 2019

中文翻译：

---

剪切颗粒悬浮液中的颗粒动力学

报道了使用动态声散射法对库埃特池中非布朗玻璃珠的中性浮力悬浮液的颗粒动力学进行测量。在剪切速率为0.26到6.59 s ^{-1的情况下}，在定子和转子之间整个间隙上的稳定剪切流下研究了动力学 颗粒浓度从20％到50％，从而可以对动力学进行全面研究。对于所有剪切速率和浓度，平均粒子速度曲线都随单元内部的深度线性变化。颗粒速度的波动很大，表明颗粒并不仅限于流线型，而是在稳定流动过程中基本上持续波动。我们的数据表明波动是各向异性的。平行于流动且垂直方向的速度波动（颗粒温度）的分量远大于径向方向的分量。波动各向异性随着浓度的增加而减小。©2018美国化学工程师学会AIChE J，65：840–849，2019