Diffusion and mobility in a stirred dense granular material |
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Authors: | Geng Junfei Behringer R P |
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Institution: | Department of Physics and Center for Nonlinear and Complex Systems, Duke University, Durham, NC 27708-0305, USA. |
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Abstract: | We describe a probe of diffusivity (D) and mobility (B) for a dense 2D granular system. We introduce random motion by stirring, and characterize D by particle tracking. To measure B we measure the force needed to push a particle through the medium at fixed velocity, v, using three sizes of tracer particle. We find simple Brownian diffusion, but B depends strongly on v because the force needed to push a tracer through a sample is nearly independent of v. Data for D/B depend on the tracer particle size. |
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