Details

Autor(en) / Beteiligte

• JUNFEI GENG
• BEHRINGER, R. P

Titel

Diffusion and mobility in a stirred dense granular material

Ist Teil von

• Physical review letters, 2004-12, Vol.93 (23), p.238002.1-238002.4, Article 238002

Ort / Verlag

Ridge, NY: American Physical Society

Erscheinungsjahr

2004

Link zum Volltext

Quelle

American Physical Society

Beschreibungen/Notizen

• 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.