论文标题
润滑颗粒材料在倾斜平面上的流动
Flow of lubricated granular material on an inclined plane
论文作者
论文摘要
我们研究了球形形状，毫米大小的颗粒材料的重力驱动流动，并涂有非球形，微米大小的无摩擦润滑剂颗粒。使用两个不同尺寸的颗粒在倾斜平面上进行实验，以使润滑剂变化。粒子容量流速表现出非单调的行为，并增加润滑剂浓度。它显示在较低的润滑剂浓度下增加，然后在较高的润滑剂浓度下降低。润滑剂颗粒粘在颗粒颗粒表面，从而减少了颗粒间摩擦。然而，在较高浓度下的润滑颗粒的存在会阻尼粒子间碰撞，从而减少了颗粒室内动量转移。然后，由于粒子间摩擦和颗粒间碰撞的竞争作用而引起观察到的行为中的非单调性。目前的工作和其中观察到的整体行为提供了一个简单的实验系统，以表征在药物和其他相关工业应用中添加的润滑剂材料的影响。
We have studied the gravity driven flow of spherical shaped, millimetric sized granular material coated with aspherical, micron-sized, near frictionless lubricant particles. Experiments were performed on an inclined plane using two different sized particles for varying concentrations of the lubricant. The particle volumetric flow rate exhibits a non-monotonic behavior with increasing lubricant concentration. It shows an increase at lower lubricant concentration followed by a decrease at higher lubricant concentration. The lubricant particles adhere to the granular particle surface thereby reducing the inter-particle friction. However, presence of lubricant particles at higher concentration damps out inter-particle collision thereby reducing the interparticle momentum transfer. Non-monotonicity in the observed behavior is then conjectured to arise due to competing effects of inter-particle friction and inter-particle collision. The present work and the overall observed behavior therein provides a simple experimental system to characterize the effects of added lubricant material in pharmaceutical and other relevant industrial applications.
