title: Coefficient of restitution for wet particles.
abstract: 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.
authors.affiliation: Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Gollwitzer
authors.forename: Ingo
authors.initials: I
authors.lastname: Rehberg
authors.forename: Christof A
authors.initials: CA
authors.lastname: Kruelle
authors.forename: Kai
authors.initials: K
authors.lastname: Huang
mesh_terms: D003102:Colloids / Q000737:chemistry*; D003198:Computer Simulation; D008956:Models, Chemical; D008958:Models, Molecular; D012212:Rheology / Q000379:methods*; D033081:Shear Strength; D012996:Solutions / Q000737:chemistry*; D017155:Wettability
chemical_list: D003102:Colloids; D012996:Solutions