Berlin 2005 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.98: Poster

Montag, 7. März 2005, 15:30–18:00, Poster TU D

Solid - fluid transition of a monlayer of particles: MD simulations — •Jennifer Kreft^1,2, Andreas Götzendorfer², Christof Krülle², and Ingo Rehberg² — ¹Center for Nonlinear Dynamics, Universtiy of Texas at Austin — ²Experimentalphysik V, Universität Bayreuth

Granular media can resemble different states of matter such as a solid, liquid and gas. Since grains are dissipative, maintaining a fluid like state requires constant input of energy. We study granular material that is shaken in both the horizontal (perpendicular to gravity) and vertical (parallel to gravity) directions with peak accelerations between 1 and 1.5 times gravity. When a single monolayer of particles is excited in this manner, a coexistence of the fluid like and solid like phases of the grains persists for many thousands of cycles. A molecular dynamics, event driven, three dimensional simulation of frictional hard spheres is used to study this phenomenon. The size of the fluidized region and the horizontal speed at which the boundary between states travels in simulation are compared to experimental results. Also, the granular temperature and trajectories of the grains are analyzed to investigate how the different regions can stably coexist.