The present Letter addresses the resuspension of microscopic glass particles from a monolayer bed into a turbulent gas flow. With an intermediate surface coverage, here set to about $10\%$ of the field of view, we report two distinct detachment mechanisms. At relatively low flow velocities, few loosely adhering particles move on the wall to eventually collide with neighboring particles resulting in a clustered resuspension. At higher fluid velocities, mostly individual particles resuspend due to their interaction with the turbulent flow. resuspension curve, showing the remaining particle fraction as a function of the flow velocity, exhibits a strong bimodal character.

中文翻译：

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碰撞诱导微观粒子从单层沉积物中重新悬浮的证据

本信函解决了微观玻璃颗粒从单层床重新悬浮到湍流气流中的问题。具有中间表面覆盖率，此处设置为约$10\%$在视野中，我们报告了两种不同的分离机制。在相对较低的流速下，很少有松散粘附的颗粒在壁上移动，最终与相邻的颗粒发生碰撞，导致聚集的再悬浮。在较高的流体速度下，由于与湍流的相互作用，大多数单个颗粒会重新悬浮。再悬浮曲线，显示剩余颗粒分数作为流速的函数，表现出强烈的双峰特征。