Influence of surface roughness on the tangential coefficient of restitution in particle-particle collisions

In this experimental study, two highly spherical 1.5 mm sized zirconia particles are brought into collision in free space at moderate impact velocities and at different collision angles. The collision is recorded by two synchronized high-speed cameras and the particle movements are analyzed in three dimensions. The focus of the investigation is on the tangential restitution coefficient, which depends on the collision angle. Several series of experiments are carried out with varying surface roughness of the particles adjusted by mechanical treatment. It is shown that even at relatively low surface roughness levels, the tangential restitution coefficient tends to exhibit strong inconsistency in the form of scattering, which increases with increasing surface roughness. Nevertheless, the fundamental dependence on the collision angle remains unaffected by the parameter variations carried out in this study.

Subjects

Contact mechanics

Free fall test setup

Particle collision dynamics

Surface roughness

Tangential restitution coefficient

DDC Class

620.1: Engineering Mechanics and Materials Science

Funding(s)

Micro scale study of solid and fluid phenomena in interparticle collisions under dry and wet conditions

Projekt DEAL

Lizenz

https://creativecommons.org/licenses/by/4.0/

Publication version

publishedVersion

Name

1-s2.0-S0032591026008405-main.pdf

Type

Main Article

Size

5.94 MB

Format

Adobe PDF

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Influence of surface roughness on the tangential coefficient of restitution in particle-particle collisions