论文标题
连续振动引起的一层颗粒床中的障碍物上升：受振动速度控制的两个动态状态
Rising obstacle in a one-layer granular bed induced by continuous vibrations: two dynamical regimes governed by vibration velocity
论文作者
论文摘要
在振动的颗粒培养基中障碍物的运动不断上升是颗粒分离的经典问题，被称为巴西坚果（BN）效应。效果的控制振动参数一直是一个长期存在的问题。最近指出了仅通过振动速度来表征BN效应的一种简单可能性。在悠久的研究历史之前，这个问题已经引起争议，只有少数系统为简单的可能性提供了。在这里，我们研究了在连续振动下垂直定位的单层颗粒床中障碍物的上升运动。我们发现上升运动由两个不同的方案组成，第一和第二个方向都仅受振动参数（仅受振动速度）的控制。我们进一步证明了简单的缩放定律很好地描述了这两个制度。我们的结果支持BN效应的控制参数的新兴可能性，并表明此功能将是普遍的。我们提出了两种不同的不同方案的对流和拱效应的可能机制，并证明了这些机制解释了缩放定律，然后是我们的实验数据。
Rising motion of an obstacle in a vibrated granular medium is a classic problem of granular segregation, and called the Brazil nut (BN) effect. The controlling vibration parameters of the effect has been a long-standing problem. A simple possibility that the BN effect can be characterized solely by vibration velocity has recently been pointed out. The issue has become controversial before a long history of research, with only a few systems have provided for the simple possibility. Here, we investigate the rising motion of an obstacle in a vertically positioned one-layer granular bed under continuous vibrations. We find the rising motion is composed of two distinct regimes, and the first and second regimes are both governed, in terms of vibration parameters, solely by the vibration velocity. We further demonstrate simple scaling laws well describe the two regimes. Our results support the emergent possibility on the controlling parameters of the BN effect and suggests that this feature would be universal. We propose two possible mechanisms of convection and arch effect for the two distinct regimes and demonstrate these mechanism explain the scaling laws followed by our experimental data.
