Particle-laden viscous thin-film flows on an incline: experiments compared with an equilibrium theory
Particle-laden viscous thin-film flows on an incline: experiments compared with an equilibrium theory
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充满颗粒的粘性薄膜在斜坡上流动：实验与平衡理论的比较
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
A. Bertozzi
中科院分区：
文献类型：
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作者：
N. Murisic;J. Ho;V. Hu;P. Latterman;T. Koch;K. Lin;M. Mata;A. Bertozzi
我们考虑重力驱动的在倾斜方向上的载微粒薄膜流动。根据倾角和颗粒的体积分数，可以观察到三种不同的状态：颗粒要么沉降出流，要么聚集在运动前沿，要么保持充分混合。实验是在不同粒径和流体粘度的条件下进行的。结果与平衡理论相吻合，该理论平衡了剪切引起的迁移和在法向的沉降。我们发现，充分混合的状态在本质上是短暂的，颗粒大小和液体粘度都决定了它发生的时间尺度。
We consider gravity driven flows of particle-laden thin films on an incline. Three distinct regimes are observed depending on the inclination angle and the bulk volume fraction of particles: the particles either settle out of the flow, aggregate at the moving front, or remain well-mixed. The experiments are carried out with a range of particle sizes and fluid viscosities. The results compare well with an equilibrium theory balancing shear-induced migration with settling in the normal direction. We find that the well-mixed regime is transient in nature, with both the particle size and the liquid viscosity a ecting the time scale on which it occurs.