2017/08/31 by Daisuke Tsuji, Michio Otsuki, Hiroaki Katsuragi
Engineering · Materials Science · Physics and Astronomy · #Classical mechanics #Constant (computer programming) #Dynamics (music) #Fluid Dynamics and Turbulent Flows #Flux (metallurgy) #Geology #Geotechnical engineering #Granular flow and fluidized beds #Material Dynamics and Properties #Materials science #Mechanics #Nonlinear system #Physics #Pile #Relaxation (psychology) #Vibration #cond-mat.soft
paper · pdf · doi:10.1103/physrevlett.120.128001
published as Phys. Rev. Lett. 120, 128001 (2018) · 5 pages, 4 figures
arxiv created 2018/01/10 · openalex publication_date 2018/03/23 · arxiv updated 2018/03/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Nonlinear relaxation dynamics of a vertically vibrated granular pile is experimentally studied. In the experiment, the flux and slope on the relaxing pile are measured by using a high-speed laser profiler. The relation of these quantities can be modeled by the nonlinear transport law assuming the uniform vibrofluidization of an entire pile. The fitting parameter in this model is only the relaxation efficiency, which characterizes the energy conversion rate from vertical vibration into horizontal transport. We demonstrate that this value is a constant independent of experimental conditions. The actual relaxation is successfully reproduced by the continuity equation with the proposed model. Finally, its specific applicability toward an astrophysical phenomenon is shown.