Pillitteri Salvatore, Opsomer Eric, Lumay Geoffroy, Vandewalle Nicolas
Quartier Agora, allée du six Août 19, Liège, Belgium.
Soft Matter. 2020 Sep 11. doi: 10.1039/d0sm00939c.
For reaching high packing fractions, grains of various sizes are often mixed together allowing the small grains to fill the voids created by the large ones. However, in most cases, granular segregation occurs leading to lower packing fractions. We performed a wide set of experiments with different binary granular systems, proving that two main parameters are respectively the volume fraction f of small beads and the grain size ratio α. In addition, we show how granular segregation affects the global packing fraction. We propose a model with a strong dependency on α that takes into account possible granular segregation. Our model is in good agreement with both earlier experimental and simulation data.
为了达到高填充率，通常会将各种尺寸的颗粒混合在一起，让小颗粒填充大颗粒形成的空隙。然而，在大多数情况下，会发生颗粒分离，导致填充率降低。我们对不同的二元颗粒系统进行了大量实验，证明两个主要参数分别是小珠子的体积分数f和粒径比α。此外，我们展示了颗粒分离如何影响全局填充率。我们提出了一个对α有强烈依赖性的模型，该模型考虑了可能的颗粒分离。我们的模型与早期的实验和模拟数据都吻合得很好。
