We performed experiments to determine the critical moment for movement initiation of a millimeter bead on a rotating rough surface. The corresponding critical angular velocities were measured for glass and stainless-steel ball bearings over two different rough surfaces with glued glass beads. A basic theoretical analysis was developed to explain the observed results. Although the expectation of a simple approach with the presence of the obstacles offered by a rough surface could be sufficient to describe the problem, we prove here that the sole consideration of these obstacles, and even friction, are insufficient to explain the results in the range of a few-millimeter glass particles. Where the thermodynamic work of adhesion between surfaces is significant, the adhesion forces must be considered in the force balance for particle detachment. This effect is a determinant for describing theoretically and numerically the dynamics of millimeter particles.

我们进行了实验，以确定在旋转的粗糙表面上毫米珠运动开始的关键时刻。在带有胶粘玻璃珠的两个不同粗糙表面上测量玻璃和不锈钢球轴承的相应临界角速度。开发了基本的理论分析来解释观察到的结果。尽管期望采用简单方法并存在由粗糙表面提供的障碍物足以说明问题，但我们在此证明，仅考虑这些障碍物，甚至是摩擦力，不足以解释范围内的结果几毫米的玻璃颗粒。在表面之间的粘附力的热力学功很重要的地方，必须在粘附力平衡中考虑粘附力，以进行颗粒分离。