Rising and sinking intruders in dense granular flows
Rising and sinking intruders in dense granular flows
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DOI：
10.1103/physrevresearch.2.022069
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发表时间：
2020-06-30
影响因子：
4.2
通讯作者：
Umbanhowar, Paul B.
中科院分区：
文献类型：
--
作者：
Jing, Lu;Ottino, Julio M.;Umbanhowar, Paul B.
我们通过计算确定密集颗粒流中单个球形入侵颗粒上的净床力，作为颗粒尺寸、颗粒密度、剪切速率、上覆压力和重力的函数。恢复了一个简单的类似浮力的比例定律（类似于流体中的比例定律），但比例因子取决于离散接触引起的颗粒尺寸比。将床力与入侵者重量进行比较，可以预测入侵者是上升还是下沉，这与自由表面颗粒流的各种独立实验的数据一致。
We computationally determine the net bed force on single spherical intruder particles in dense granular flows as a function of particle size, particle density, shear rate, overburden pressure, and gravity. A simple buoyancy-like scaling law is recovered (analogous to that in fluids), but with a scale factor that depends on the particle size ratio due to discrete contacts. Comparing the bed force with the intruder weight results in predictions of whether an intruder rises or sinks that agree with data from various independent experiments of free surface granular flows.