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Energetic aspects of granule impact: Influence of the liquid layers
Publikationstyp
Conference Paper
Date Issued
2009-07
Sprache
English
Author(s)
Journal
Volume
1145
Start Page
796
End Page
799
Citation
6th International Conference on Micromechanics of Granular Media, Powders and Grains (2009)
Contribution to Conference
Publisher DOI
Scopus ID
The influence of the thickness (40 um - 1 mm) and the viscosity (1-300 mPa-s) of the liquid layer at the contact as well as impact velocity (1-2.4 m/s) on the energy dissipation during the normal impact of spherical granules was investigated. Using a free-fall device the restitution coefficients of γ-Al2O3 granules impacted on a steel wall with a liquid layer were measured. With increasing liquid viscosity the restitution coefficient and the critical thickness of liquid layer at which the granule sticks decreased. With decreasing impact velocity the restitution coefficient greatly decreases. A rational explanation of obtained effects was given by results of numerically solved force and energy balances.
Subjects
Energy dissipation
Granule impact
Liquid bridge
Liquid layer
Restitution coefficient