Wortel Geert H, Dijksman Joshua A, van Hecke Martin
Kamerlingh Onnes Lab, Universiteit Leiden, Postbus 9504, 2300 RA Leiden, The Netherlands.
Kamerlingh Onnes Lab, Universiteit Leiden, Postbus 9504, 2300 RA Leiden, The Netherlands and Department of Physics, Duke University, Science Drive, Durham, North Carolina 27708-0305, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Jan;89(1):012202. doi: 10.1103/PhysRevE.89.012202. Epub 2014 Jan 15.
We probe the rheology of weakly vibrated granular flows as function of flow rate, vibration strength, and pressure by performing experiments in a vertically vibrated split-bottom shear cell. For slow flows, we establish the existence of a vibration-dominated granular flow regime, where the driving stresses smoothly vanish as the driving rate is diminished. We distinguish three qualitatively different vibration-dominated rheologies, most strikingly a regime where the shear stresses no longer are proportional to the pressure.
我们通过在垂直振动的分体底部剪切池中进行实验，探究了弱振动颗粒流的流变学与流速、振动强度和压力之间的关系。对于缓慢流动，我们确定了存在一个以振动为主导的颗粒流 regime，在该 regime 中，随着驱动速率降低，驱动应力会平稳消失。我们区分了三种性质上不同的以振动为主导的流变学，最显著的是一种 regime，其中剪切应力不再与压力成正比。
