Gollwitzer Frank, Rehberg Ingo, Kruelle Christof A, Huang Kai
Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Jul;86(1 Pt 1):011303. doi: 10.1103/PhysRevE.86.011303. Epub 2012 Jul 9.
The influence of a liquid film on the coefficient of restitution (COR) is investigated experimentally by tracing freely falling particles bouncing on a wet surface. The dependence of the COR on the impact velocity and various properties of the particle and liquid is presented and discussed in terms of dimensionless numbers that characterize the interplay between inertial, viscous, and surface forces. In the Reynolds number regime where lubrication theory does not apply, the ratio of the film thickness to the particle size is found to be a crucial parameter determining the COR.
通过追踪自由下落的粒子在湿表面上反弹的过程，对液膜对恢复系数（COR）的影响进行了实验研究。根据表征惯性力、粘性力和表面力之间相互作用的无量纲数，给出并讨论了恢复系数对冲击速度以及粒子和液体各种特性的依赖性。在润滑理论不适用的雷诺数范围内，发现膜厚度与粒子尺寸之比是决定恢复系数的关键参数。
