Coefficient of restitution for particles impacting on wet surfaces: An improved experimental approach
Coefficient of restitution for particles impacting on wet surfaces: An improved experimental approach
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DOI：
10.1016/j.partic.2015.04.002
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发表时间：
2016-04-01
期刊：
影响因子：
3.5
通讯作者：
Kuipers, J. A. M.
中科院分区：
文献类型：
--
作者：
Crueger, B.;Salikov, V.;Kuipers, J. A. M.
在涉及粒子碰撞的数值模拟中，恢复系数被广泛用于表征能量耗散率。测量恢复系数的挑战是实验数据中看到的强散射，这是由于不同的颗粒特性，即形状和表面粗糙度，以及实验技术的缺陷造成的。为了最大限度地减少这种散射，研究人员开发了一种新的实验装置，该装置基于两台同步高速摄像机，在三维空间中捕捉粒子的碰撞行为。为了测量湿恢复系数，它描述了在接触区域存在液体层时颗粒的影响，可以通过高精度光学共聚焦传感器测量液体层厚度来获得额外的精度。采用改进的（三维）和传统的（二维）方法，对两种不同直径、不同相对速度和不同液层厚度的玻璃颗粒进行了恢复系数的测量，重点关注小碰撞速度和薄液层，以量化新方法精度的提高。(C) 2015年中国粒子学会，中国科学院过程工程研究所。Elsevier B.V.版权所有。
The coefficient of restitution is widely used to characterize the energy dissipation rate in numerical simulations involving particle collisions. The challenge in measuring the coefficient of restitution is the strong scatter seen in experimental data that results from varying particle properties, i.e. shape and surface roughness, and from imperfections in the experimental technique. To minimize this scattering, a novel experimental setup was developed based on two synchronized high-speed cameras capturing the collision behaviour of a particle in three dimensions. To measure the wet restitution coefficient, which describes particle impact in the presence of a liquid layer in the contact region, additional accuracy can be achieved by measuring the liquid layer thickness by a high-precision optical confocal sensor. The coefficient of restitution was measured for glass particles with two different diameters, at different relative velocities and liquid layer thicknesses, with a focus on small collision velocities and thin liquid layers, using both the improved (three dimensional) and the conventional (two dimensional) approaches to quantify the improvement of the new method's accuracy. (C) 2015 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.