Particle dynamics in sheared particulate suspensions
Particle dynamics in sheared particulate suspensions
复制标题
剪切颗粒悬浮液中的颗粒动力学
DOI：
10.1002/aic.16431
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
John H. Page
中科院分区：
文献类型：
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作者：
Anatoliy Strybulevych; Tomohisa Norisuye; Matthew Hasselfield; John H. Page
报道了利用动态声散射测量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。在剪切速率为0.26至6.59 s-1和颗粒浓度为20%至50%的情况下，在定子和转子之间的整个间隙上的稳定剪切流下研究动力学，从而能够对动力学进行全面的研究。对于所有的剪切速率和浓度，平均颗粒速度分布随细胞内的深度线性变化。颗粒速度的波动很大，表明颗粒并不局限于流线，而是在稳定流动期间继续大幅波动。我们的数据表明，波动是各向异性的。平行于流动和垂直方向的速度波动（颗粒温度）的分量远大于径向。随着浓度的增加，涨落各向异性减小。© 2018美国化学工程师学会AIChE J，65：840-849，2019
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−1and 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 EngineersAIChE J, 65: 840–849, 2019