Mon March 6th 2017
16:00 – 17:00
Seminar Dancing of wet particles: Impacts, assembly and pattern formation
Kai Huang


Towards a better understanding of the dynamics of wet granular matter, our attempts start with the coefficient of restitution (COR) that characterizes the energy dissipation at a particle level. The questions associated are: How does the COR depend on the impact velocity, various liquid and particle properties? Can we have an analytical prediction of COR for wet particle impacts?
In a monolayer system, I will show how screw-nut shaped particles under vertical vibrations assembly themselves into a rotator-crystal state with translational but no orientational order, and explain how the broken circular symmetry of particle shape leads to the preference to rotate.
Finally, I will discuss the pattern forming scenario in vibrofludized wet granular matter, from three armed rotating spirals representing propagating kink-wave fronts, to the density-wave fronts that emerge on the brink of a wet granular condensation (gas-liquid-like transition). The pattern forming mechanisms will be discussed based on an analysis of the mobility of individual particles.
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