Competition between two dynamics : interface motion and collective motion of granular particles

实验研究了二维湿颗粒系统干燥过程中水-气锋运动驱动的颗粒聚集过程。建立了颗粒与界面运动相互作用引起的颗粒集体运动模型。通过实验和数值模拟发现，该模型可以定性地再现与水-颗粒混合物干燥过程中的实验结果非常相似的迷宫图形。此外，我们的模型还证实了界面的粘滑运动和分形特性。

The aggregation process of granules driven by the motion of water-air fronts in the drying process of two-dimensional wet granular systems is experimentally studied. And a model for the collective motion of granular particles induced by an interaction with interface motion is constructed. By the experiment and the numerical simulation, it is found that the model can qualitatively reproduce labyrinthine patterns that are quite similar to those experimentally obtained in the drying process of a water-granule mixture. Moreover, the stick-slip motion of the interfaces and fractal properties are confirmed in our model.