Scaling of the normal coefficient of restitution for wet impacts

Journal Article

A thorough understanding of the energy dissipation in the dynamics of wet granular matter is essential for a continuum description of natural phenomena such as debris flow, and the development of various industrial applications such as the granulation process. The coefficient of restitution (COR), defined as the ratio between the relative rebound and impact velocities of a binary impact, is frequently used to characterize the amount of energy dissipation associated. We measure the COR by tracing a freely falling sphere bouncing on a wet surface with the liquid film thickness monitored optically. For fixed ratio between the film thickness and the particle size, the dependence of the COR on the impact velocity and various properties of the liquid film can be characterized with the Stokes number, defined as the ratio between the inertia of the particle and the viscosity of the liquid. Moreover, the COR for infinitely large impact velocities derived from the scaling can be analyzed by a model considering the energy dissipation from the inertia of the liquid film. © 2013 AIP Publishing LLC.

Full Text

Duke Authors

Cited Authors

  • Müller, T; Gollwitzer, F; Krülle, CA; Rehberg, I; Huang, K

Published Date

  • August 1, 2013

Published In

Volume / Issue

  • 1542 /

Start / End Page

  • 787 - 790

Electronic International Standard Serial Number (EISSN)

  • 1551-7616

International Standard Serial Number (ISSN)

  • 0094-243X

Digital Object Identifier (DOI)

  • 10.1063/1.4812049

Citation Source

  • Scopus