2012/10/11 by Klaus Roeller, Johannes Blaschke, Stephan Herminghaus +1 · 5 citations
Engineering · Materials Science · Physics and Astronomy · #Capillary action #Classical mechanics #Dissipation #Flow (mathematics) #Force balance #Geology #Granular flow and fluidized beds #Granular material #Granular matter #Gravitation #Material Dynamics and Properties #Mechanical energy #Mechanics #Meteorology #Particle (ecology) #Physics #Power (physics) #Theoretical and Computational Physics #Thermodynamics #cond-mat.soft
paper · pdf · doi:10.1017/jfm.2013.587
published in Journal of Fluid Mechanics 738, 407-422 (Cambridge University Press) · 9 pages, 4 color figures
arxiv created 2012/10/11 · openalex publication_date 2013/12/06 · arxiv updated 2014/08/26 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/05
Abstract We study the arrest of three-dimensional flow of wet granular matter subject to a sinusoidal external force and a gravitational field confining the flow in the vertical direction. The minimal strength of the external force that is required to keep the system in motion, i.e. the critical force, is determined by considering the balance of injected and dissipated power. This provides a prediction whose quality is demonstrated by a data collapse for an extensive set of event-driven molecular-dynamics simulations where we varied the system size, particle number, the energy dissipated upon rupturing capillary bridges, and the bridge length at which rupture occurs. The same approach also works for systems that are kept at a fixed density by confining walls. In both cases, this universal method provides the critical force irrespective of the flow profile, and without specifying the hydrodynamic equations.